Weather in Washington in August 2025
Average weather
Average temperature in Washington in August
Going from a maximum of +95°F during the day to a minimum of +63°F during the night, the temperature in August averages around +88°F.
The average maximum temperature goes down 6% by the end of the month, compared with the beginning of the month, from +82°F to +81°F.
Is Washington warm or cold in August?
Washington is typically warm in August.
Maximum temperatures go down compared to the previous month from +88°F to +86°F. The minimum temperature also goes down from +72°F to +70°F.
It’s generally warm, but pack a long-sleeve shirt for evenings.
August is one of the warmest months in Washington, here is the comparison with other months:
Climate in Washington in August
| July | August | September | ||||
|---|---|---|---|---|---|---|
| Avg. temperature | ||||||
| +88°F | +86°F | +79°F | ||||
| Min. temperature | ||||||
| +54°F | +48°F | +43°F | ||||
| Max. temperature | ||||||
| +104°F | +102°F | +99°F | ||||
| Rainfall | ||||||
| 135 mm | 112 mm | 117 mm | ||||
| Wind | ||||||
| 2 m/s | 2 m/s | 2 m/s | ||||
| Humidity | ||||||
| 66% | 68% | 70% | ||||
| Air pressure | ||||||
| 1014 HPa | 1015 HPa | 1017 HPa | ||||
| Sunny days | ||||||
| 2 | 3 | 5 | ||||
| Cloudy days | ||||||
| 9 | 11 | 11 | ||||
| Rainy days | ||||||
| 13 | 13 | 12 | ||||
| Snowy days | ||||||
| 0 | 0 | 0 | ||||
August weather is still as good as in July. It’s getting colder in August. From +88°F in the day, the average maximum temperature lowers to +86°F. As August arrives, the amount of rainfall goes down. On average, the rainfall volume decreases from 135 mm to 112 mm. Humidity rises from 66% to 68%. The average wind speed doesn’t change much during August, staying around 2 m/s. The good news is there are likely to be more sunny days in August, from 2 to 3.
September brings much the same weather, it remains good.
Wind
The average wind speed is 3 m/s getting up to 5 m/s which is a light breeze; barely moving the tree leaves.
The average wind speed in Washington is gradually increasing during August, going from 3 m/s to 5 m/s over the course of the month.
Rain
How was the weather last August in Washington?
Climate Change Over the Years
The climate in Washington in August has not changed that much over the last 43 years.
The average temperature was the lowest in 1996 (+64°F) and the highest in 2023 (+70°F). The driest year was 2007 with only 654 mm of rainfall, and the wettest year was 2022 with 1801 mm.
FAQ
Is August a good time to visit Washington?
Can you sunbathe in Washington in August?
Is Washington rainy in August?
Is it sunny in Washington in August?
Other cities in USA
Monthly weather in Washington
Source of the data
For this page, we’ve looked at the typical weather in Washington, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.