Washington Weather in September
September in Washington brings very high temperatures, with daytime highs of 34°C (93°F) and nights around 18°C (64°F). Expect around 26 mm (1 in) of rainfall during the month.
Rainfall in Washington in September
You can expect rain on around 4 days based on historical patterns, with 26 mm (1 in) average for the month. Rain is scarce this month and when it does fall, it tends to be light. Unlikely to disrupt plans significantly.
Temperature in Washington in September
In September, expect very high temperatures in Washington, with highs of 34°C (93°F) and lows of 18°C (64°F) at night. Indoor breaks or shaded spots can make the warmer part of the day much more comfortable. Nights cool down to 18°C (64°F), so a light jacket or extra layer is useful once the sun goes down. On the plus side, the cooler nights make for comfortable sleeping conditions.If you're looking for dry conditions and comfortable temperatures, September may not be the ideal month to visit Washington. Our weather planner can help you explore destinations with more pleasant weather conditions.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our Washington's climate page.
Washington Temperature in September
Min Temperature
18°C (64°F)
Max Temperature
34°C (93°F)
Chance of Rain
14%
Precipitation
26 mm (1 in)
Rainy days
4 days
Best Places in the United States of America in September
Find out more about the weather in the United States of America and which places have the best travel conditions in this month. See all of the United States of America in September →
perfect weather
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What to Wear in Washington in September
Hot weather in September means keeping cool is the priority. Loose-fitting clothes in natural fabrics work best. Pack plenty of shorts, tank tops, and breathable shirts. Don't forget a hat, swimwear, and comfortable sandals. Pack a light rain jacket or compact umbrella for occasional showers.What To Do in Washington in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit the United States of America, check out our Washington's climate page.
See the full Washington climate overview or explore weather in the United States of America.
