Washington DC Weather in August
United States · Humid Subtropical climate · Data averaged from 2020-01-01 to 2024-12-31 (5 years)
August in Washington DC sees average temperatures ranging from a low of 20.3°C (68.5°F) to a high of 29.7°C (85.5°F), with a mean of 24.5°C (76.1°F). Compared to the annual average of 14.2°C (57.6°F), this month is 10.3°C warmer than the yearly norm. Precipitation averages 218.2mm, making it approximately 100.0mm wetter than the monthly average of 119.0mm. This is the wettest month of the year, with 218.2mm of precipitation and around 20.0 rainy days. The city receives an average of 10.5 hours of sunshine per day during August, with relative humidity averaging 76.2%. Wind speeds reach an average maximum of 13.7 km/h. For travelers, this month offers a temperature experience in Washington DC, with wetter-than-average conditions compared to the rest of the year.
There's something about Washington DC in late March when the cherry blossoms peak that turns the political city into something tender. I stood at the Tidal Basin one spring as 3,000 trees bloomed pink against the Jefferson Memorial — the data says peak bloom is usually the last week of March to first week of April, around 15°C. Summer (June-August) is famously brutal: 30°C with 70% humidity, the kind that makes the National Mall feel like a sauna. October is DC's secret weapon: 18°C, golden leaves along the Mall, and the cultural season reopening. Winter is quieter and the museums are empty — a trade-off worth making.
August vs Adjacent Months
| Metric | July | August | September |
|---|---|---|---|
| Mean Temp | 26.0°C (78.8°F) | 24.5°C (76.1°F) | 20.7°C (69.3°F) |
| Rainfall | 161.6mm | 218.2mm | 134.0mm |
| Sunshine | 11.9 hrs | 10.5 hrs | 8.9 hrs |
| Humidity | 72.2% | 76.2% | 74.2% |
| Wind | 14.1 km/h | 13.7 km/h | 14.6 km/h |
| Rainy Days | 20.8 | 20.0 | 14.4 |
Seasonal Context
August falls in Summer in the Northern Hemisphere. Summer brings the warmest conditions of the year with the longest daylight hours. For travelers visiting Washington DC in August, the data indicates mixed conditions based on the combination of temperature, precipitation, and daylight hours.
Frequently Asked Questions
What is the average temperature in Washington DC in August?
The average temperature in Washington DC during August ranges from 20.3°C (68.5°F) to 29.7°C (85.5°F), with a mean of 24.5°C (76.1°F).
How much does it rain in Washington DC in August?
Washington DC receives an average of 218.2mm of precipitation in August, spread across approximately 20.0 rainy days. This is the wettest month of the year.
What should I pack for Washington DC in August?
Based on August weather data, pack layers including light jackets and t-shirts, plus an umbrella. Rain gear is essential — this month averages 218.2mm of precipitation.
Is August a good time to visit Washington DC?
August is a month with challenging conditions. Plan activities carefully and stay hydrated.
Other Months for Washington DC
Cities with Similar August Climate (Humid Subtropical)
Data Source: Open-Meteo historical archive (2020-01-01 to 2024-12-31). Daily measurements aggregated into monthly climate normals. Coordinates: 38.9°, -77.04°. Timezone: America/New_York. Last updated: 2026-07-30.