Washington weather in August: Washington, District of Columbia: normal highs, lows, rain and records for August
Washington in August has a normal high of 88°F and a normal low of 71°F, a daily mean of 79°F, falling from 89°F on the 1st to 86°F by the 31st. Measurable precipitation falls on 9 days in a normal August, 3.25 inches in all. (NOAA 1991-2020 normals)
In metric: a normal high of 31°C and low of 22°C, 83 mm of precipitation in August.
- NOAA stationWashington Reagan Airport
- Station IDUSW00013743
- Location38.85°N 77.03°W
- Elevation10 ft (3 m)
- From the center4 miles
- Population702,250
- Jan 45° 30°
- Feb 48° 32°
- Mar 57° 39°
- Apr 68° 48°
- May 77° 58°
- Jun 85° 68°
- Jul 90° 72°
- Aug 88° 71°
- Sep 81° 64°
- Oct 69° 52°
- Nov 58° 42°
- Dec 49° 35°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
How warm is Washington in August?
The normal high is 88°F and the normal low 71°F, for a daily mean of 79.4°F. August is 1.6°F cooler than July and 7.0°F warmer than September. August is the 2nd warmest month of the year in Washington and the 8th wettest. Across the month the normal high falls 3°F, from 89°F on August 1 to 86°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 77°F and 82°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 31%).
| Day | High | Low | Chance of 0.01 in | Chance of 0.10 in |
|---|---|---|---|---|
| August 1 | 89°F | 72°F | 31% | 20% |
| August 8 | 89°F | 72°F | 30% | 20% |
| August 15 | 88°F | 71°F | 29% | 19% |
| August 22 | 87°F | 71°F | 28% | 18% |
| August 31 | 86°F | 69°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 | 89°F | 72°F | 31% | 20% | 14 h 10 min |
| August 2 | 89°F | 72°F | 31% | 20% | 14 h 10 min |
| August 3 | 89°F | 72°F | 31% | 20% | 14 h 10 min |
| August 4 | 89°F | 72°F | 31% | 20% | 14 h 10 min |
| August 5 | 89°F | 72°F | 31% | 20% | 14 h |
| August 6 | 89°F | 72°F | 31% | 20% | 14 h |
| August 7 | 89°F | 72°F | 31% | 20% | 14 h |
| August 8 | 89°F | 72°F | 30% | 20% | 14 h |
| August 9 | 89°F | 72°F | 30% | 20% | 14 h |
| August 10 | 89°F | 72°F | 30% | 20% | 13 h 50 min |
| August 11 | 89°F | 72°F | 30% | 20% | 13 h 50 min |
| August 12 | 88°F | 72°F | 30% | 20% | 13 h 50 min |
| August 13 | 88°F | 72°F | 30% | 20% | 13 h 50 min |
| August 14 | 88°F | 71°F | 30% | 19% | 13 h 50 min |
| August 15 | 88°F | 71°F | 29% | 19% | 13 h 40 min |
| August 16 | 88°F | 71°F | 29% | 19% | 13 h 40 min |
| August 17 | 88°F | 71°F | 29% | 19% | 13 h 40 min |
| August 18 | 88°F | 71°F | 29% | 19% | 13 h 40 min |
| August 19 | 88°F | 71°F | 28% | 19% | 13 h 30 min |
| August 20 | 88°F | 71°F | 28% | 19% | 13 h 30 min |
| August 21 | 87°F | 71°F | 28% | 18% | 13 h 30 min |
| August 22 | 87°F | 71°F | 28% | 18% | 13 h 30 min |
| August 23 | 87°F | 70°F | 28% | 18% | 13 h 30 min |
| August 24 | 87°F | 70°F | 27% | 18% | 13 h 20 min |
| August 25 | 87°F | 70°F | 27% | 18% | 13 h 20 min |
| August 26 | 87°F | 70°F | 27% | 18% | 13 h 20 min |
| August 27 | 86°F | 70°F | 27% | 18% | 13 h 20 min |
| August 28 | 86°F | 70°F | 27% | 18% | 13 h 10 min |
| August 29 | 86°F | 69°F | 27% | 18% | 13 h 10 min |
| August 30 | 86°F | 69°F | 27% | 18% | 13 h 10 min |
| August 31 | 86°F | 69°F | 27% | 18% | 13 h 10 min |
- Normal high
- 88°FAugust average
- Normal low
- 71°FAugust average
- Precipitation
- 3.25 inmonth total
- Days with precipitation
- 90.01 inch or more
- Days at 90°F or more
- 11
- Daylight
- 14 h 10 min to 13 h 10 minAugust 1 to August 31
- Days at 70°F or more
- 31
- Days at 80°F or more
- 28
- Sunshine
- 79%of clear-sky sunlight (NASA)
Source: NOAA NCEI 1991-2020 daily normals, station USW00013743; monthly normals. Daylight is computed from the place's latitude with NOAA's solar equations.
Does it rain in Washington in August?
On a given August day the chance of 0.01 inch or more is 29% on average, highest around August 1 (31%). In all, 3.25 in falls on 9 days of a normal August, 1 of them with an inch or more.
In a normal August in Washington, 11 days reach 90°F.
Source: NOAA NCEI 1991-2020 daily and monthly normals, station USW00013743.
How humid and windy is Washington in August?
At 3 p.m. the normal temperature is 84°F with 50% relative humidity and a dew point of 63°F; at 6 a.m. it is 70°F with 82% humidity. The wind averages 7.8 mph, most often from the southeast in the afternoon.
| Time | Temperature | Dew point | Humidity | Wind | Clear or few clouds |
|---|---|---|---|---|---|
| 6 a.m. | 70°F | 64°F | 82% | 6.7 mph | 30% |
| 9 a.m. | 76°F | 65°F | 68% | 8.2 mph | 38% |
| noon | 82°F | 64°F | 54% | 8.7 mph | 23% |
| 3 p.m. | 84°F | 63°F | 50% | 9.4 mph | 20% |
| 6 p.m. | 80°F | 64°F | 57% | 9.5 mph | 30% |
| 9 p.m. | 76°F | 65°F | 69% | 7.2 mph | 47% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00013743. Hourly normals exist only for NOAA's first-order stations; a dash where NOAA publishes no value for that hour (the sky at some hours).
What are the records for August in Washington?
The warmest August temperature on Washington's official record (since 1871) is 106°F, on August 6, 1918; the coldest is 49°F, on August 24, 1890. The wettest August brought 14.41 in (1928).
The August mean against the 1991-2020 normal of 79.4°F: 2021 80.9°F (+1.5), 2022 80.4°F (+1.0), 2023 78.7°F (−0.7), 2024 79.3°F (−0.1), 2025 75.8°F (−3.6), 2026 80.1°F (+0.7). 3 of 6 ran warmer than normal.
| August | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 80.9°F | +1.5°F | 9.07 in |
| 2022 | 80.4°F | +1.0°F | 2.42 in |
| 2023 | 78.7°F | −0.7°F | 3.71 in |
| 2024 | 79.3°F | −0.1°F | 4.58 in |
| 2025 | 75.8°F | −3.6°F | 0.20 in |
| 2026 | 80.1°F | +0.7°F | 4.27 in |
Source: records: ACIS, NWS threaded record DCAthr; recent months: ACIS, station USW00013743. Records and recent months use complete months only.
How does August in Washington compare across District of Columbia?
Across the 1 places PlainClimate covers in District of Columbia, August normal highs run from 88°F in Washington to 88°F in Washington; Washington's is 88°F.
Source: NOAA NCEI 1991-2020 monthly normals for every station in the state.