Weather & climate · Washington, D.C.

Best Time to Visit United States

May to June and September

The best time to visit the United States is May to June and September, when daytime highs in Washington, D.C. are around 23–28°C. July to August and October are also a good time to go. July is the warmest month (31°C by day), January the coldest (-4°C at night), and June the wettest with about 118 mm of rain.

31°C

Warmest: July

-4°C

Coldest nights: January

1152 mm

Rain per year

118 mm

Wettest: June

United States weather by month

Jan4°C-4°C67 mm
Feb6°C-3°C70 mm
Mar11°C1°C84 mm
Apr18°C7°C92 mm
May23°C13°C109 mm
Jun28°C18°C118 mm
Jul31°C21°C116 mm
Aug30°C20°C109 mm
Sep27°C16°C107 mm
Oct20°C9°C105 mm
Nov13°C3°C80 mm
Dec7°C-1°C95 mm

Best time Good Less ideal

Average high Average low Rain (mm per month)

Month	High	Low	Rain	Humidity	Cloud cover	Verdict
January	4°C	-4°C	67 mm	82%	61%	Cold
February	6°C	-3°C	70 mm	80%	61%	Cold
March	11°C	1°C	84 mm	79%	60%	Fair
April	18°C	7°C	92 mm	76%	59%	Fair
May	23°C	13°C	109 mm	78%	61%	Best time
June	28°C	18°C	118 mm	74%	56%	Best time
July	31°C	21°C	116 mm	69%	56%	Good
August	30°C	20°C	109 mm	70%	54%	Good
September	27°C	16°C	107 mm	72%	52%	Best time
October	20°C	9°C	105 mm	76%	52%	Good
November	13°C	3°C	80 mm	79%	53%	Fair
December	7°C	-1°C	95 mm	83%	61%	Cold

Data: NASA POWER (Prediction Of Worldwide Energy Resources) — 25-year climate averages 2001–2025, public domain, for the area around Washington, D.C. (38.88, -77.03). Satellite and model averages — local weather stations can differ by 1–2 °C, and mountains or coasts elsewhere in the United States have their own climate.

Frequently asked questions

When is the best time to visit the United States?

May to June and September. The best time to visit the United States is May to June and September, when daytime highs in Washington, D.C. are around 23–28°C. July to August and October are also a good time to go. July is the warmest month (31°C by day), January the coldest (-4°C at night), and June the wettest with about 118 mm of rain.

What is the hottest month in the United States?

July, with average highs of 31°C in Washington, D.C..

What is the coldest month in the United States?

January, when nights drop to about -4°C and days reach 4°C.

What is the rainiest month in the United States?

June with about 118 mm; January is the driest (67 mm).

When should I avoid visiting the United States?

December is the least comfortable month on average: 7°C by day and 95 mm of rain.

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