Delaware, United States experiences average highs of 17°C (63°F) and lows of 8°C (46°F) throughout the year. Rainfall is moderate, averaging about 11 rainy days per month. Average highs have cooled by 0.8°C (1.4°F) across the available records.
Delaware, United States Weather & Climate 2026
Monthly climate averages for Delaware, United States. Based on 10-year ERA5 reanalysis data.
Climate Overview
Drier season: Jan–Dec 
Wetter season: Mar–Jul At-a-Glance Climate Summary
Live Weather & Air Quality
Key figures
Climate Score
5.2/10
Best: May, June, July, August, September
UV Index
5
Low
Temperature 17°C / 8°C
Feels Like 15°C / 5°C
Rainy Days 11
Rainfall 95 mm
Sunshine 8 h
Humidity 71%
Wind Speed 19 km/h
Dew Point 7°C
Snow Days 6 days
Frost Days 16 days
Hottest Month
28°C
July
Avg Low19°C
Rain13days
Coldest Month
-5°C
January
Avg High3°C
Rain10days
Driest Month
8days
September
Avg High25°C
Avg Low16°C
Windiest Month
22 km/h
March (Gusts 46)
Worst Time to Visit
Consider avoiding January, February, March, December due to very cold temperatures, frequent rain.
Sun Position
Sunrise 06:03
Daylight 15h
Sunset 21:05
Live conditions—
Delaware on the map · live conditions
Delaware, United States
- Continent
- Americas
- Country
- United States
- City
- Delaware
- Population
- 38K
- Elevation
- 265 m
- Coordinates
- 40.30°, -83.07°
Seasonal Breakdown
Spring
Mar–May
Avg High 17°C
Avg Low 6°C
Rain 14 days/mo
1/3 best months
Summer
Jun–Aug
Avg High 27°C
Avg Low 18°C
Rain 12 days/mo
3/3 best months
Autumn
Sep–Nov
Avg High 18°C
Avg Low 9°C
Rain 9 days/mo
1/3 best months
Winter
Dec–Feb
Avg High 5°C
Avg Low -3°C
Rain 11 days/mo
Climate Charts
Based on historical averages (2016–2025)
Monthly Temperatures
HighLowShaded bands show the typical range across the available yearly records.
Line chart showing monthly temperatures. Jan: 3°C / -5°C . Feb: 6°C / -3°C . Mar: 12°C / 1°C . Apr: 17°C / 6°C . May: 22°C / 12°C . Jun: 26°C / 17°C . Jul: 28°C / 19°C . Aug: 27°C / 18°C . Sep: 25°C / 16°C . Oct: 19°C / 10°C . Nov: 11°C / 2°C . Dec: 6°C / -2°C .
Monthly Rainfall
Rainfall
Bar chart showing monthly rainfall. Jan: 84 mm. Feb: 95 mm. Mar: 106 mm. Apr: 111 mm. May: 121 mm. Jun: 119 mm. Jul: 110 mm. Aug: 73 mm. Sep: 74 mm. Oct: 78 mm. Nov: 76 mm. Dec: 87 mm.
Monthly Humidity
Humidity
Line chart showing monthly humidity. Jan: 73%. Feb: 71%. Mar: 66%. Apr: 67%. May: 73%. Jun: 71%. Jul: 74%. Aug: 74%. Sep: 70%. Oct: 69%. Nov: 70%. Dec: 75%.
Monthly Wind Speed
Wind SpeedGusts
Bar chart showing monthly wind speed. Jan: 21 km/h . Feb: 22 km/h . Mar: 22 km/h . Apr: 22 km/h . May: 19 km/h . Jun: 17 km/h . Jul: 15 km/h . Aug: 14 km/h . Sep: 15 km/h . Oct: 19 km/h . Nov: 20 km/h . Dec: 20 km/h .
Sunshine
Sunshine
Sunshine: Jan: 5h. Feb: 6h. Mar: 8h. Apr: 9h. May: 10h. Jun: 12h. Jul: 12h. Aug: 11h. Sep: 10h. Oct: 8h. Nov: 6h. Dec: 5h.
UV Index
UV Index
Bar chart showing monthly UV index. Jan: UV 2. Feb: UV 3. Mar: UV 5. Apr: UV 6. May: UV 6. Jun: UV 7. Jul: UV 7. Aug: UV 7. Sep: UV 6. Oct: UV 4. Nov: UV 3. Dec: UV 2.
Monthly Daylight Hours
Daylight12h reference
Monthly Dew Point & Comfort
Dew Point Dry Comfortable Humid Muggy Oppressive
Snow Days
Snow DaysSnowfall
Snow Days: Jan: 10 days. Feb: 7 days. Mar: 4 days. Apr: 2 days. May: 0 days. Jun: 0 days. Jul: 0 days. Aug: 0 days. Sep: 0 days. Oct: 0 days. Nov: 4 days. Dec: 6 days.
Climate Trends
Average highs have cooled by 0.8°C (1.4°F) across the available records. Average rainfall is trending wetter by about 9 mm.
2016 to 2025
Avg high Avg rainfall
Climate summary
| Last 12 months | All years | |
|---|---|---|
| Hottest month | Jul 2025 · 29°C | Jul · 28°C |
| Coldest month | Jan 2025 · -9°C | Jan · -5°C |
| Wettest month | May 2025 · 169 mm | May · 121 mm |
| Windiest month | Mar 2025 · 25 km/h | Mar · 22 km/h |
Month-by-Month Weather Table
January
Poor 
February
Poor March
Poor April
Fair May best
Good June best
Excellent July best
Good August best
Excellent September best
Excellent October
Good November
Poor December
Poor | Month | Temp | Feels Like | Rain | Sun | Humidity | UV | Status | Details |
|---|---|---|---|---|---|---|---|---|
| January | 3°C / -5°C | -2°C / -10°C | 10days (84 mm) Wet | 4.9h Fair | 73% Muggy | 2.3 Moderate | Poor | View Details |
| February | 6°C / -3°C | 2°C / -8°C | 11days (95 mm) Wet | 6.3h Fair | 71% Muggy | 3.4 Moderate | Poor | View Details |
| March | 12°C / 1°C | 8°C / -3°C | 13days (106 mm) Wet | 7.6h Good | 66% Muggy | 4.7 Moderate | Poor | View Details |
| April | 17°C / 6°C | 14°C / 2°C | 13days (111 mm) Wet | 9h Good | 67% Muggy | 5.7 High | Fair | View Details |
| May best | 22°C / 12°C | 22°C / 11°C | 15days (121 mm) Wet | 9.7h Good | 73% Muggy | 6.4 High | Good | View Details |
| June best | 26°C / 17°C | 28°C / 17°C | 13days (119 mm) Wet | 11.5h Excellent | 71% Muggy | 6.9 High | Excellent | View Details |
| July best | 28°C / 19°C | 31°C / 21°C | 13days (110 mm) Wet | 11.5h Excellent | 74% Muggy | 7.1 Very High | Good | View Details |
| August best | 27°C / 18°C | 30°C / 20°C | 11days (73 mm) Wet | 11.1h Excellent | 74% Muggy | 6.6 High | Excellent | View Details |
| September best | 25°C / 16°C | 26°C / 16°C | 8days (74 mm) Wet | 9.5h Good | 70% Muggy | 5.5 High | Excellent | View Details |
| October | 19°C / 10°C | 17°C / 7°C | 9days (78 mm) Wet | 7.8h Good | 69% Muggy | 4 Moderate | Good | View Details |
| November | 11°C / 2°C | 7°C / -2°C | 9days (76 mm) Wet | 6h Fair | 70% Muggy | 2.6 Moderate | Poor | View Details |
| December | 6°C / -2°C | 2°C / -7°C | 11days (87 mm) Wet | 4.8h Fair | 75% Muggy | 2.1 Moderate | Poor | View Details |
Compare Nearby City Climates
Frequently Asked Questions
The best months to visit Delaware are May, June, July, August, September, when temperatures are comfortable and rainfall is at its lowest. This is based on 10-year climate averages for Delaware, scoring temperature, rainfall, humidity, and sunshine hours.
The hottest month in Delaware is July, with average daytime highs of 28°C (83°F). Plan outdoor activities for early morning or late afternoon if visiting during this period.
The coldest month in Delaware is January, with average overnight lows of -5°C (23°F). Pack warm layers and expect shorter daylight hours during this period.
The wettest month in Delaware is May, averaging 121mm of precipitation across 15 rainy days. An umbrella or waterproof jacket is essential.
The rainy season in Delaware runs through May, March, April, June, with the heaviest rainfall in May. Based on 10-year averages for Delaware.
Delaware receives approximately 100 sunshine hours per year. The sunniest month is June with around 12 hours. Based on climate data for Delaware.
The least favorable months to visit Delaware are January, February, March, December, primarily due to very cold temperatures, frequent rain. For the best conditions, consider May, June, July, August, September instead.
The annual average UV index in Delaware is 5, classified as moderate. Standard sun protection (sunscreen, hat) is recommended during prolonged outdoor exposure.
Average humidity in Delaware is 71%, classified as moderate. Humidity levels are generally comfortable and should not affect outdoor activities for most people.
Yes, Delaware receives snow. Months with snowfall average 6 snow days and 8 cm (3 in) of accumulation, with about 16 frost days during winter.
Average wind speeds in Delaware are 19 km/h (12 mph). The windiest month is March with peak winds reaching 22 km/h (14 mph) (gusts up to 46 km/h / 29 mph).
Delaware averages 4 clear-sky days per month with overall cloud cover around 62%. The clearest skies occur in September.
The annual average dew point in Delaware is 7°C (45°F), which feels dry and comfortable. Outdoor activities are comfortable year-round from a humidity standpoint.
Delaware has a Humid Subtropical climate, classified as Cfa under the Köppen system. Temperate climates have mild winters and warm summers, with rainfall spread across the year and four distinct seasons.
The 'feels like' temperature in Delaware ranges from 5°C (41°F) to 15°C (59°F) on average. Wind chill makes winters feel noticeably colder than the actual temperature — layered clothing is recommended.
Yes, June is a great time to visit Delaware. It earns a climate score of 8.4/10 with Excellent.
For June in Delaware, pack Umbrella, Waterproof jacket, Breathable clothing, Sunscreen (SPF 30+), Sun hat. With average highs of 26°C (80°F) and 13 rainy days, these essentials will keep you comfortable.
Data Source
Climate data derived from ERA5 reanalysis (ECMWF), averaged over 2016–2025. Sea surface temperature from marine reanalysis data. Climate scores and seasonal estimates are computed by WorldStats.
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