Washington Weather in September

With daytime temperatures of 24°C (75°F) and nighttime lows of 11°C (52°F), September in Washington brings high temperatures during the day. Do keep in mind that quite a bit of rainfall is typical. Around 75 mm (3 in) falls on average.

Rainfall in Washington in September

Records from the past 30 years suggest around 11 days of rain, with 75 mm (3 in) average for the month. Neither particularly heavy nor particularly frequent, the rain this month is about average. A light jacket should be enough on most wet days.

Temperature in Washington in September

September in Washington is generally perfect, with days reaching 24°C (75°F) and nights settling around 11°C (52°F). Conditions stay fairly consistent through the month, making it easier to plan what to wear. With lows of 11°C (52°F), nights are cool. If you're out after dark, an extra layer will keep you comfortable. The cooler air at night is also great for getting a good rest.

Sunshine in Washington in September

The city usually sees around 197 hours of sunlight, indicating many sunny days — a great month for sightseeing.

If you're a fan of comfortable temperatures and drier conditions, September is a great time to visit.

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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 11°C (52°F)  

Max Temperature 24°C (75°F)  

Chance of Rain 37%  

Precipitation 75 mm (3 in)  

Rainy days 11 days  

Humidity 72% *  

Sunshine 197 hours *  

Percentage Sunshine 53% *  

* Data from: Pittsburgh, the United States of America (36 KM, 22 Miles).

What to Wear in Washington in September

Comfortable temperatures call for an easy wardrobe in September. Pack summer basics like t-shirts and shorts, but include a light jacket for cooler moments. A pair of comfortable walking shoes is essential. Wet weather is likely, so pack waterproof gear for multiple rainy days. You'll definitely want to pack sunglasses and sunscreen. There will be plenty of bright sunshine this month.

What To Do in Washington in September

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

7/10

Cycling

9/10

Walking

9/10

Camping

8/10

Outdoor sports

9/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

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.

More climate data for Washington

Temperature Rainfall Sunshine Humidity

See the full Washington climate overview or explore weather in the United States of America.