What is the hottest month in Washington D.C.?

July is the hottest month in Washington D.C., with average daytime highs of 31°C / 89°F and overnight lows of 21°C / 71°F (averages for 2021–2025).

What is the coldest month in Washington D.C.?

January is the coldest month in Washington D.C., with average highs of 6°C / 43°F and lows of -2°C / 28°F.

How much rain does Washington D.C. get a year?

Washington D.C. receives about 1299 mm of rainfall a year, spread over roughly 126 wet days. July is the wettest month (168 mm on average) and November the driest (62 mm).

When is the best time to visit Washington D.C.?

October, April, September are the most comfortable months in Washington D.C.: mild daytime temperatures with the least rainfall of the year.

Washington D.C. Climate — Average Highs, Lows & Rainfall by Month

Washington D.C. has a temperate climate with four distinct seasons. Daytime temperatures average 31°C / 89°F in July, the warmest month, and drop to 6°C / 43°F in January, the coldest. Overnight lows in January average -2°C / 28°F. Washington D.C. receives about 1299 mm of rain a year across roughly 126 wet days, with July the wettest month.

Averages for 2021–2025 · Open-Meteo Historical Weather API (ERA5 reanalysis) · Updated 2026-10-05

Hottest month

July

31°C / 89°F

Coldest month

January

-2°C / 28°F

Wettest month

July

168 mm

Annual rainfall

1299 mm

~126 wet days

Monthly averages in Washington D.C.

Average daytime high, overnight low and rainfall for each month of the year.

Average temperatures and rainfall by month in Washington D.C., 2021–2025
Month	Avg high	Avg low	Rainfall	Wet days
January	6°C / 43°F	-2°C / 28°F	84 mm	8
February	9°C / 48°F	0°C / 31°F	82 mm	10
March	15°C / 58°F	4°C / 38°F	98 mm	8
April	20°C / 67°F	8°C / 47°F	95 mm	11
May	24°C / 74°F	13°C / 55°F	139 mm	12
June	29°C / 85°F	18°C / 65°F	138 mm	12
July	31°C / 89°F	21°C / 71°F	168 mm	16
August	30°C / 85°F	20°C / 68°F	140 mm	13
September	26°C / 79°F	17°C / 62°F	118 mm	11
October	20°C / 69°F	10°C / 51°F	78 mm	8
November	14°C / 57°F	4°C / 40°F	62 mm	8
December	9°C / 48°F	0°C / 33°F	98 mm	9

Best time to visit Washington D.C.

October, April, September offer the most comfortable weather in Washington D.C.: mild daytime temperatures with the year's lowest rainfall — October averages 20°C (69°F); April averages 20°C (67°F); September averages 26°C (79°F).

Washington D.C. climate FAQ

What is the hottest month in Washington D.C.?: July is the hottest month in Washington D.C., with average daytime highs of 31°C / 89°F and overnight lows of 21°C / 71°F (averages for 2021–2025).
What is the coldest month in Washington D.C.?: January is the coldest month in Washington D.C., with average highs of 6°C / 43°F and lows of -2°C / 28°F.
How much rain does Washington D.C. get a year?: Washington D.C. receives about 1299 mm of rainfall a year, spread over roughly 126 wet days. July is the wettest month (168 mm on average) and November the driest (62 mm).
When is the best time to visit Washington D.C.?: October, April, September are the most comfortable months in Washington D.C.: mild daytime temperatures with the least rainfall of the year.

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Source: Open-Meteo Historical Weather API (ERA5 reanalysis), Open-Meteo. Averages are daily means across 2021–2025 and are rounded for display — for a live forecast see the Washington D.C. weather page.