Delaware Weather by Month
Delaware, the second smallest state in the United States, boasts a temperate climate characterized by four distinct seasons. Located on the Atlantic Coast, Delaware experiences a mix of coastal and continental weather patterns, leading to mild winters and warm, humid summers. The state’s proximity to the ocean influences its climate, providing moderate temperatures year-round and contributing to its relatively high humidity levels.
Spring in Delaware brings gradually warming temperatures and increased rainfall, fostering lush landscapes and blooming flora. Summers are typically hot and humid, with occasional thunderstorms providing relief from the heat. The coastal regions, such as Rehoboth Beach, benefit from cooling sea breezes, making them popular destinations during the summer months. Autumn ushers in cooler temperatures and stunning fall foliage, especially in the northern parts of the state like Wilmington and the Brandywine Valley. Winters are generally mild but can occasionally experience cold snaps and light snowfall, particularly in January and February.
Precipitation is evenly distributed throughout the year, ensuring a consistently green and vibrant environment. Delaware’s diverse geography, including beaches, forests, and historic towns, offers a variety of activities and attractions suitable for each season. Whether you’re exploring the sandy shores in summer, enjoying colorful landscapes in fall, or visiting historical sites in spring, Delaware’s climate provides an inviting backdrop for residents and visitors alike.
Average Temperature and Precipitation by Month
| Month | Avg Temp (°F) | Avg Temp (°C) | Avg Precipitation (inches) |
|---|---|---|---|
| January | 37°F | 3°C | 3.5 |
| February | 40°F | 4°C | 3.0 |
| March | 48°F | 9°C | 4.2 |
| April | 58°F | 14°C | 3.6 |
| May | 67°F | 19°C | 4.0 |
| June | 76°F | 24°C | 3.7 |
| July | 81°F | 27°C | 4.5 |
| August | 79°F | 26°C | 4.2 |
| September | 72°F | 22°C | 4.1 |
| October | 61°F | 16°C | 3.2 |
| November | 51°F | 11°C | 3.4 |
| December | 41°F | 5°C | 3.7 |
Monthly Weather, Clothing, and Landmarks
January
Weather: January is the coldest month in Delaware, with average temperatures ranging from 25°F to 45°F (-4°C to 7°C). The state experiences chilly days and cold nights, with occasional light snowfall, particularly in the northern regions. Coastal areas may experience slightly milder conditions due to the moderating effects of the Atlantic Ocean. Precipitation is moderate, with a mix of rain and snow throughout the month. Windy conditions are common, especially along the coast, adding to the overall chill factor.
Clothing: Dressing warmly is essential in January. Heavy coats, sweaters, and thermal layers are recommended to stay comfortable during outdoor activities. Accessories such as gloves, scarves, and hats are important for additional warmth, especially on windy days. Waterproof boots and jackets are advisable to handle rainy or snowy conditions. Indoor venues are well-heated, so wearing layers allows for easy adjustment between outdoor and indoor temperatures.
Landmarks: Despite the cold, January offers unique opportunities to explore Delaware’s indoor attractions. The Winterthur Museum, Garden and Library near Wilmington provides an immersive experience into American decorative arts and history within a cozy indoor setting. For art enthusiasts, the Delaware Art Museum offers a diverse collection ranging from American art to British Pre-Raphaelite works. Nature lovers can enjoy peaceful winter walks at the Bombay Hook National Wildlife Refuge, where migratory birds and wildlife can be observed in a serene, snow-dusted landscape.
February
Weather: February in Delaware remains cold, with average temperatures between 28°F and 48°F (-2°C to 9°C). The month experiences slightly less precipitation than January, but snowfall can still occur, especially during early February. Days start to become slightly longer, and occasional sunny days offer brief respites from the winter chill. Coastal areas continue to experience brisk winds, and inland regions may have icy conditions during colder spells.
Clothing: Warm and layered clothing is essential for February. Heavy coats, sweaters, and insulated pants help maintain warmth during outdoor excursions. Accessories like gloves, scarves, and hats remain important, particularly on windy or snowy days. Waterproof and slip-resistant footwear are recommended to navigate wet or icy surfaces safely. Keeping an umbrella handy is also advisable due to intermittent rain showers.
Landmarks: February is an excellent time to delve into Delaware’s rich history and culture. Visit the Hagley Museum and Library in Wilmington, where you can explore the original du Pont gunpowder mills and learn about early American industry. The Biggs Museum of American Art in Dover offers a comprehensive collection of American fine and decorative arts. For a romantic getaway around Valentine’s Day, consider a stay at one of the charming bed and breakfasts in the historic town of Lewes, offering cozy accommodations and access to boutique shops and restaurants.
March
Weather: March marks the beginning of spring in Delaware, with temperatures gradually rising to an average range of 35°F to 55°F (2°C to 13°C). The weather is variable, with a mix of cool days and occasional milder periods. Precipitation increases, and rain becomes more common than snow, although early March can still see occasional flurries. The state begins to awaken with early spring blooms and budding trees, particularly towards the end of the month.
Clothing: Dressing in layers is key during March to accommodate fluctuating temperatures. Medium-weight jackets, sweaters, and long-sleeved shirts are appropriate, along with pants and closed-toe shoes. A waterproof jacket or umbrella is useful due to increased rainfall. As temperatures can vary throughout the day, wearing removable layers allows for comfort during warmer afternoons and cooler mornings or evenings.
Landmarks: March is a great time to enjoy Delaware’s emerging spring scenery. Explore the Brandywine Creek State Park, where early wildflowers and budding trees signal the arrival of spring. The Nemours Estate in Wilmington reopens for the season, offering tours of its stunning mansion and beautifully landscaped gardens. For a unique experience, attend the Dover St. Patrick’s Day Parade, featuring festive floats, live music, and local cuisine, celebrating Irish heritage in the state’s capital.
April
Weather: April brings milder and more consistent spring weather to Delaware, with average temperatures ranging from 45°F to 65°F (7°C to 18°C). The month experiences moderate rainfall, contributing to lush greenery and vibrant blooms across the state. Days become longer and sunnier, providing pleasant conditions for outdoor activities. Occasional cool spells and rain showers can occur, but overall, April offers comfortable and refreshing weather.
Clothing: Light to medium-weight clothing is suitable for April. Long-sleeved shirts, light sweaters, and jackets provide comfort during cooler mornings and evenings, while t-shirts may be appropriate during warmer afternoons. Comfortable pants or jeans and closed-toe shoes are recommended. Carrying a lightweight rain jacket or umbrella is advisable due to intermittent spring showers.
Landmarks: April is an ideal time to visit Delaware’s gardens and outdoor spaces. The Mt. Cuba Center near Hockessin showcases native plant gardens in full spring bloom, perfect for leisurely walks and photography. Enjoy the Delaware Beaches, such as Rehoboth Beach, before the summer crowds arrive, offering peaceful strolls along the boardwalk and dining at local seafood restaurants. The Historic New Castle district offers charming cobblestone streets, colonial architecture, and guided tours that bring Delaware’s rich history to life amid pleasant spring weather.
May
Weather: May ushers in warmer temperatures and abundant sunshine in Delaware, with averages ranging from 55°F to 75°F (13°C to 24°C). The risk of frost diminishes, and the landscape is lush and vibrant, with flowers and trees in full bloom. Rainfall remains moderate, often occurring as brief showers or thunderstorms. The comfortable and stable weather conditions make May a popular month for outdoor festivals and activities across the state.
Clothing: Comfortable and light clothing is appropriate for May. Short-sleeved shirts, light sweaters, and jackets accommodate varying temperatures throughout the day. Pants, jeans, or skirts paired with comfortable walking shoes or sandals are suitable for most activities. Bringing a lightweight rain jacket or umbrella is advisable to prepare for occasional rain showers or thunderstorms.
Landmarks: May offers numerous opportunities to enjoy Delaware’s outdoor attractions. Attend the Winterthur Point-to-Point Steeplechase, a prestigious horse racing event featuring tailgating, picnicking, and festive activities. Explore the Delaware Seashore State Park, where you can enjoy hiking, bird watching, and fishing amid beautiful coastal scenery. The Rehoboth Beach Boardwalk Arts Festival showcases local artists and craftsmen, offering a delightful blend of culture and seaside charm under the pleasant May skies.
June
Weather: June marks the beginning of summer in Delaware, bringing warm temperatures averaging between 65°F and 85°F (18°C to 29°C). The weather is generally sunny and humid, with longer daylight hours perfect for outdoor activities. Occasional thunderstorms can occur, usually in the afternoons or evenings. Coastal areas benefit from refreshing sea breezes, making beach visits particularly enjoyable during this month.
Clothing: Light and breathable clothing is essential in June. Short-sleeved shirts, shorts, dresses, and sandals are suitable for the warm and humid conditions. A light sweater or jacket may be useful for cooler evenings, especially near the coast. Packing sunscreen, sunglasses, and hats is important to protect against strong summer sun. An umbrella or lightweight rain jacket can be handy for unexpected showers.
Landmarks: June is the perfect time to enjoy Delaware’s beautiful beaches and outdoor festivals. Visit Bethany Beach for sunbathing, swimming, and seaside dining in a family-friendly atmosphere. Experience the Clifford Brown Jazz Festival in Wilmington, the largest free jazz festival on the East Coast, featuring renowned musicians and a lively ambiance. Explore the Trap Pond State Park, where you can kayak among the northernmost natural stand of bald cypress trees, hike scenic trails, and enjoy picnicking under sunny June skies.
July
Weather: July is the hottest month in Delaware, with average temperatures ranging from 70°F to 88°F (21°C to 31°C). The weather is typically hot and humid, with plenty of sunshine and longer days. Afternoon thunderstorms are relatively common but usually short-lived, providing brief relief from the heat. Coastal areas continue to enjoy cooling sea breezes, making them popular destinations for both residents and tourists seeking respite from the inland heat.
Clothing: Dressing in lightweight and breathable fabrics is essential during July. Shorts, t-shirts, sundresses, and sandals are appropriate for staying cool in the heat. Swimwear is a must for beach and pool activities. Accessories like hats, sunglasses, and sunscreen are important to protect against intense sunlight. Carrying a reusable water bottle helps stay hydrated during outdoor excursions.
Landmarks: July is ideal for enjoying Delaware’s coastal attractions and summer festivities. Celebrate Independence Day with fireworks and concerts at Rehoboth Beach or Dover’s Fourth of July Celebration. Attend the Delaware State Fair in Harrington, featuring agricultural exhibits, carnival rides, concerts, and delicious local food. For nature enthusiasts, explore the Cape Henlopen State Park, offering beautiful beaches, biking trails, historic sites like Fort Miles, and opportunities for fishing and wildlife observation under the warm July sun.
August
Weather: August in Delaware remains hot and humid, with average temperatures between 68°F and 86°F (20°C to 30°C). The month experiences abundant sunshine, with occasional afternoon thunderstorms providing temporary relief from the heat. As summer progresses, evenings may start to cool slightly, especially towards the end of the month. Coastal regions continue to enjoy pleasant sea breezes, making beach outings enjoyable throughout August.
Clothing: Light, airy clothing is recommended for August’s warm conditions. Shorts, lightweight shirts, sundresses, and comfortable sandals help keep cool during daytime activities. Swimwear is essential for beach visits and water activities. Protective accessories like hats, sunglasses, and sunscreen are important to shield from strong sun exposure. Packing a light rain jacket or umbrella is useful for sudden thunderstorms.
Landmarks: August is perfect for exploring Delaware’s outdoor and cultural offerings. Enjoy the Rehoboth Beach Sandcastle Contest, where impressive sand sculptures line the shore. Visit the Air Mobility Command Museum in Dover to explore historic aircraft and aviation exhibits. Experience the Big August Quarterly in Wilmington, one of the oldest African American festivals in the nation, celebrating culture and history with music, food, and spiritual gatherings under the summer sky.
September
Weather: September brings the onset of autumn to Delaware, with temperatures moderating to an average range of 60°F to 78°F (16°C to 26°C). Humidity levels decrease, and the weather becomes more comfortable and stable. The month features pleasant sunny days and cooler nights, with a reduced likelihood of thunderstorms. Early fall foliage begins to appear, particularly in the northern parts of the state, adding color to the landscapes.
Clothing: Transitional clothing is suitable for September. Light layers such as long-sleeved shirts, lightweight sweaters, and jackets accommodate varying temperatures throughout the day. Pants, jeans, and comfortable closed-toe shoes are appropriate for most activities. It’s still advisable to carry sunscreen and sunglasses for sunny afternoons.
Landmarks: September is ideal for outdoor exploration and festivals in Delaware. Attend the Brandywine Festival of the Arts in Wilmington, showcasing works from hundreds of artists alongside live music and food vendors. Explore the Ashland Nature Center, where you can enjoy hiking trails amid early fall colors and participate in educational programs about local wildlife. For a coastal experience, visit Fenwick Island State Park, offering quieter beaches and opportunities for kayaking and paddleboarding in the milder September weather.
October
Weather: October fully embraces autumn in Delaware, with average temperatures ranging from 50°F to 68°F (10°C to 20°C). The weather is generally cool and crisp, with lower humidity and plenty of clear, sunny days. Fall foliage reaches its peak, painting the state in vibrant hues of red, orange, and yellow. Rainfall is moderate, and evenings become noticeably cooler, signaling the approach of winter.
Clothing: Warmer clothing layers are appropriate for October. Long-sleeved shirts, sweaters, and light to medium-weight jackets provide comfort during cooler days and evenings. Pants, jeans, and closed-toe shoes or boots are suitable for outdoor activities. Bringing a scarf or hat can add extra warmth during chillier times, especially in the mornings and nights.
Landmarks: October’s colorful landscapes make it a perfect time for scenic drives and outdoor events. Visit the Brandywine Valley, renowned for its stunning fall foliage and attractions like the Longwood Gardens, featuring spectacular autumn displays and fountain shows. Participate in the Sea Witch Festival in Rehoboth Beach, a lively Halloween-themed event with parades, costume contests, and family-friendly activities. Explore the First State Heritage Park in Dover, offering historical tours and reenactments amid the beautiful fall backdrop.
November
Weather: November brings cooler and more variable weather to Delaware, with average temperatures between 40°F and 58°F (4°C to 14°C). The state experiences increased rainfall, and the first frost typically occurs during this month. Days become shorter, and overcast skies are more common, contributing to a chillier and more subdued atmosphere. Late November may see occasional light snowfall, especially in northern regions.
Clothing: Dressing warmly is important in November. Medium to heavy-weight jackets, sweaters, and long-sleeved shirts are recommended for comfort. Wearing pants, jeans, and closed-toe shoes or boots helps keep warm during outdoor activities. Accessories like scarves, gloves, and hats become useful, especially on colder or windy days. A waterproof jacket or umbrella is advisable to handle increased rainfall.
Landmarks: November offers opportunities to explore Delaware’s indoor and cultural attractions. Visit the Delaware History Museum in Wilmington to learn about the state’s rich past through engaging exhibits. Enjoy holiday shopping and dining in the charming Historic Lewes district, adorned with festive decorations. For outdoor enthusiasts, take a peaceful hike through the White Clay Creek State Park, where the late fall scenery provides a tranquil setting for nature appreciation.
December
Weather: December marks the beginning of winter in Delaware, with average temperatures ranging from 32°F to 48°F (0°C to 9°C). The weather is cold, with a mix of clear and overcast days. Light to moderate snowfall can occur, particularly towards the end of the month, creating picturesque winter scenes. Precipitation remains moderate, with a combination of rain and snow depending on the temperature fluctuations. The festive season brings a lively and cheerful atmosphere across the state.
Clothing: Warm and insulating clothing is essential for December. Heavy coats, sweaters, and thermal layers help maintain warmth during outdoor activities. Accessories like gloves, scarves, and hats are important for additional protection against the cold. Waterproof and insulated boots are recommended to navigate snowy or wet conditions comfortably. Layering allows for adaptability between indoor and outdoor environments.
Landmarks: December is a festive time to explore Delaware’s holiday attractions. Experience the enchanting Yuletide at Winterthur, where the museum and gardens are beautifully decorated, offering tours and seasonal events. Visit the Rehoboth Beach Christmas Tree Lighting and Holiday Parade, bringing holiday spirit to the coastal community. The Nemours Estate also offers special holiday tours, showcasing lavish decorations and illuminated gardens that capture the magic of the season.
