Weatheo

Washington Weather by Month

Average temperatures, rainfall and humidity for Washington, United States, month by month, built from OpenWeather’s historical records. Use it to see what a typical Washington month looks like before you travel — then check the live Washington forecast for the days ahead.

Warmest month

July

31°C average high

Coolest month

January

-2°C average low

Wettest month

May

123 mm of rain

Driest month

February

64 mm of rain

Average temperature and rainfall in Washington by month

Averages of the daily highs and lows recorded in each month, with total rainfall, mean humidity and mean wind speed.

MonthAvg highAvg lowRecord low / highRainfallHumidityWind
January6°C-2°C-16°C / 25°C
72 mm
67%13 km/h
February9°C0°C-18°C / 27°C
64 mm
65%13 km/h
March14°C3°C-16°C / 30°C
71 mm
60%15 km/h
April20°C9°C-4°C / 33°C
87 mm
60%15 km/h
May24°C14°C2°C / 36°C
123 mm
69%12 km/h
June29°C19°C8°C / 37°C
102 mm
69%12 km/h
July31°C21°C14°C / 40°C
97 mm
72%10 km/h
August30°C20°C11°C / 37°C
91 mm
74%10 km/h
September26°C17°C5°C / 36°C
97 mm
74%10 km/h
October20°C11°C0°C / 34°C
87 mm
75%11 km/h
November14°C4°C-10°C / 28°C
95 mm
67%12 km/h
December9°C1°C-14°C / 22°C
74 mm
70%11 km/h

Best time to visit Washington

The most comfortable time to visit Washington is generally May and September to October, balancing mild daytime temperatures against the driest stretch of the year. The city has strongly marked seasons and rain concentrates around May, totalling about 1,059 mm a year.

Travellers who prefer heat should aim for July, when highs average 31°C. May is the month to avoid if rain would spoil your plans — it averages 123 mm, roughly 2× the rainfall of the driest month (February).

Source: OpenWeather historical and statistical weather data. Values are long-term averages, not a forecast — see the Washington forecast for what is happening now.

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