Climate averages 1991–2020
Wilmington (Delaware), United States weather
in July.
A hot, wet month: the warmest and the joint 7th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
July is a hot month in Wilmington (Delaware), United States: daytime highs average 29.3°C and nights cool to about 20.7°C. By daytime temperature it is the warmest month of the year.
Expect about 99 mm of rain on roughly 11 days, which makes July a wet month (the joint 7th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 14 h 41 min on an average July day.
The nearest other city in this atlas is Philadelphia (40 km away). In July its highs average 29.9°C, 0.6°C warmer than Wilmington (Delaware), United States, with 98 mm of rain.
Among the 498 cities listed in the United States, Wilmington (Delaware), United States ranks joint 292nd of 498 for the warmest July highs and joint 376th of 498 for the driest July (rainfall, lowest first). The mean July high of those 498 cities is 30.3°C; Wilmington (Delaware), United States is 1.0°C cooler than that mean.
From July to August, average highs fall by 1.1°C to 28.2°C, and monthly rainfall rises from 99 mm to 100 mm.
The annual picture
July in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Wilmington (Delaware), United States climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 4.5°C-3.0°C | -3.0°C | 82 | 9.2 | 9.710 h |
| February | 6.1°C-2.4°C | -2.4°C | 76 | 8.7 | 10.711 h |
| March | 10.6°C1.2°C | 1.2°C | 105 | 10.7 | 11.912 h |
| April | 16.9°C6.8°C | 6.8°C | 92 | 10.5 | 13.213 h |
| May | 22.0°C12.4°C | 12.4°C | 89 | 10.8 | 14.314 h |
| June | 26.8°C17.7°C | 17.7°C | 99 | 10.4 | 14.915 h |
| July, selected | 29.3°C20.7°C | 20.7°C | 99 | 10.9 | 14.715 h |
| August | 28.2°C19.9°C | 19.9°C | 100 | 10.4 | 13.714 h |
| September | 24.6°C16.3°C | 16.3°C | 107 | 9.6 | 12.512 h |
| October | 18.2°C10.0°C | 10.0°C | 91 | 8.1 | 11.211 h |
| November | 12.1°C4.1°C | 4.1°C | 75 | 7.9 | 10.010 h |
| December | 6.9°C-0.3°C | -0.3°C | 100 | 9.0 | 9.49 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
July in nearby cities
- Philadelphia in JulyUnited States · 40 kmHigh 29.9°C · Low 20.7°C · 98 mm rain
- Camden in JulyUnited States · 42 kmHigh 29.8°C · Low 20.6°C · 95 mm rain
- Cherry Hill in JulyUnited States · 49 kmHigh 29.6°C · Low 20.7°C · 95 mm rain
- Reading, United States in JulyUnited States · 73 kmHigh 29.7°C · Low 19.7°C · 95 mm rain
- Trenton in JulyUnited States · 86 kmHigh 29.6°C · Low 20.0°C · 106 mm rain
- Allentown in JulyUnited States · 96 kmHigh 29.1°C · Low 18.6°C · 98 mm rain
- Bethlehem, United States in JulyUnited States · 99 kmHigh 29.0°C · Low 18.6°C · 91 mm rain
- Baltimore in JulyUnited States · 105 kmHigh 29.6°C · Low 21.0°C · 97 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Wilmington) is explained once on the Wilmington (Delaware), United States year overview and on the Sources, method and limits page.