Washington weather in August
August in Washington: hot, rainy — a great time to visit.
#8 of 12 months in Washington · #424 of 604 destinations to visit in August · comfort 70/100 (tier B)
Updated June 2026 · climate normals from ERA5 reanalysis
Washington climate normals — August
| Daytime high | 30°C / 86°F | 🥵 hot |
|---|---|---|
| Nighttime low | 21°C / 71°F | |
| Feels like (high) | 33°C / 91°F | |
| Rainfall | 127 mm / 5 in | 🌧 rainy |
| Rainy days | 14 days | |
| Humidity | 70% | 💧 humid |
| Dew point | 19°C / 66°F | |
| Sunshine | 10.6 h/day | |
| Daylight | 13.6 h | |
| Wind | 12 km/h / 7 mph | |
| Air quality (US AQI) | 64 | 🙂 moderate |
Monthly averages from ERA5 reanalysis. AQI is the mean US Air Quality Index for the month.
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Washington in August — FAQ
- Is August a good time to visit Washington?
- August in Washington: hot, rainy — a great time to visit. It ranks #8 of 12 months for Washington on SeasonMap's comfort score (70/100).
- What is the weather like in Washington in August?
- In August, Washington averages a daily high of 30°C and a low of 21.4°C, with about 126.9 mm of rain over roughly 14.2 rainy days.
- What is the air quality in Washington in August?
- Washington has a mean US Air Quality Index of about 64 in August.