Wilmington weather in August: Wilmington, Delaware: normal highs, lows, rain and records for August
Wilmington in August has a normal high of 85°F and a normal low of 67°F, a daily mean of 76°F, falling from 86°F on the 1st to 83°F by the 31st. Measurable precipitation falls on 9 days in a normal August, 3.98 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 29°C and low of 19°C, 101 mm of precipitation in August.
- NOAA stationWilmington Airport
- Station IDUSW00013781
- Location39.67°N 75.60°W
- Elevation79 ft (24 m)
- From the center6 miles
- Population73,176
- Jan 41° 26°
- Feb 44° 27°
- Mar 53° 34°
- Apr 64° 44°
- May 74° 53°
- Jun 82° 63°
- Jul 87° 68°
- Aug 85° 67°
- Sep 79° 59°
- Oct 67° 47°
- Nov 56° 37°
- Dec 46° 30°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Wilmington in August?
The normal high is 85°F and the normal low 67°F, for a daily mean of 75.8°F. August is 1.8°F cooler than July and 6.9°F warmer than September. August is the 2nd warmest month of the year in Wilmington and the 5th wettest. Across the month the normal high falls 3°F, from 86°F on August 1 to 83°F on August 31. From one year to the next August's mean temperature typically moves about 2.1°F either way (NOAA's standard deviation), so roughly two Augusts in three average between 74°F and 78°F.
Bars above: each day's normal high to low. Columns below: the chance of 0.01 inch or more of precipitation that day, on a scale of 0 to 100% (highest 32%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| August 1 | 86°F | 68°F | 32% | 21% |
| August 8 | 86°F | 68°F | 31% | 20% |
| August 15 | 85°F | 67°F | 30% | 20% |
| August 22 | 84°F | 66°F | 28% | 19% |
| August 31 | 83°F | 64°F | 27% | 18% |
Every day of August: normal high, low and chance of precipitation (warmest afternoon August 1, coldest night August 31)
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in | Daylight |
|---|---|---|---|---|---|
| August 1 | 86°F | 68°F | 32% | 21% | 14 h 20 min |
| August 2 | 86°F | 68°F | 31% | 21% | 14 h 10 min |
| August 3 | 86°F | 68°F | 31% | 21% | 14 h 10 min |
| August 4 | 86°F | 68°F | 31% | 21% | 14 h 10 min |
| August 5 | 86°F | 68°F | 31% | 21% | 14 h 10 min |
| August 6 | 86°F | 68°F | 31% | 21% | 14 h 10 min |
| August 7 | 86°F | 68°F | 31% | 21% | 14 h |
| August 8 | 86°F | 68°F | 31% | 20% | 14 h |
| August 9 | 86°F | 68°F | 31% | 20% | 14 h |
| August 10 | 86°F | 68°F | 31% | 20% | 14 h |
| August 11 | 85°F | 67°F | 31% | 20% | 14 h |
| August 12 | 85°F | 67°F | 31% | 20% | 13 h 50 min |
| August 13 | 85°F | 67°F | 30% | 20% | 13 h 50 min |
| August 14 | 85°F | 67°F | 30% | 20% | 13 h 50 min |
| August 15 | 85°F | 67°F | 30% | 20% | 13 h 50 min |
| August 16 | 85°F | 67°F | 30% | 20% | 13 h 40 min |
| August 17 | 85°F | 67°F | 30% | 19% | 13 h 40 min |
| August 18 | 85°F | 67°F | 29% | 19% | 13 h 40 min |
| August 19 | 85°F | 66°F | 29% | 19% | 13 h 40 min |
| August 20 | 85°F | 66°F | 29% | 19% | 13 h 40 min |
| August 21 | 85°F | 66°F | 28% | 19% | 13 h 30 min |
| August 22 | 84°F | 66°F | 28% | 19% | 13 h 30 min |
| August 23 | 84°F | 66°F | 28% | 18% | 13 h 30 min |
| August 24 | 84°F | 66°F | 28% | 18% | 13 h 30 min |
| August 25 | 84°F | 65°F | 27% | 18% | 13 h 20 min |
| August 26 | 84°F | 65°F | 27% | 18% | 13 h 20 min |
| August 27 | 84°F | 65°F | 27% | 18% | 13 h 20 min |
| August 28 | 84°F | 65°F | 27% | 18% | 13 h 20 min |
| August 29 | 83°F | 65°F | 27% | 18% | 13 h 10 min |
| August 30 | 83°F | 64°F | 27% | 18% | 13 h 10 min |
| August 31 | 83°F | 64°F | 27% | 18% | 13 h 10 min |
- Normal high
- 85°FAugust average
- Normal low
- 67°FAugust average
- Precipitation
- 3.98 inmonth total
- Days with precipitation
- 90.01 inch or more
- Days at 90°F or more
- 6
- Daylight
- 14 h 20 min to 13 h 10 minAugust 1 to August 31
- Days at 70°F or more
- 31
- Days at 80°F or more
- 26
- Sunshine
- 80%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00013781; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Wilmington in August?
On a given August day the chance of 0.01 inch or more is 29% on average, highest around August 1 (32%). In all, 3.98 in falls on 9 days of a normal August, 1 of them with an inch or more.
In a normal August in Wilmington, 6 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00013781.
What are the records for August in Wilmington?
The warmest August temperature on Wilmington's official record (since 1894) is 107°F, on August 7, 1918; the coldest is 43°F, on August 29, 1982. The wettest August brought 14.91 in (1911).
The August mean against the 1991-2020 normal of 75.8°F: 2021 78.2°F (+2.4), 2022 78.8°F (+3.0), 2023 76.8°F (+1.0), 2024 75.0°F (−0.8), 2025 72.6°F (−3.2), 2026 77.3°F (+1.5). 4 of 6 ran warmer than normal.
| August | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 78.2°F | +2.4°F | 2.76 in |
| 2022 | 78.8°F | +3.0°F | 2.39 in |
| 2023 | 76.8°F | +1.0°F | 2.77 in |
| 2024 | 75.0°F | −0.8°F | 6.63 in |
| 2025 | 72.6°F | −3.2°F | 1.40 in |
| 2026 | 77.3°F | +1.5°F | 5.82 in |
Source: records: ACIS, NWS threaded record ILGthr; recent months: ACIS, station USW00013781. Records and recent months use complete months only.
How does August in Wilmington compare across Delaware?
Across the 6 places PlainClimate covers in Delaware, August normal highs run from 85°F in Wilmington to 87°F in Newark; Wilmington's is 85°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.