Washington weather in September 2025

Expect 26°C daytime maximum temperatures in the shade with on average 7 hours of sunshine per day in Washington in September. Check more long-term weather averages for Washington in September before you book your next holiday to D.C. in 2025/2026.

  • 26°C maximum daytime temperature in September in Washington26
    26°C max day temperature
  • 7 hours of sunshine per day
  • 7 days with some rainfall in September in Washington7
    7 days with some rainfall
  • 15°C minimum night-time temperature in September in Washington15
    15°C min night temperature
  • 12 hours of daylight per day in September in Washington12
    12 hours of daylight per day
  • Low heat & humidity in September in WashingtonL
    Low heat & humidity
  • 87 mm monthly rainfall in September in Washington87
    87 mm of monthly rainfall
  • UV (maximum) index 7 (High) in September in Washington7
    7 (High) UV index

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The September weather guide for D.C., represented by Washington, (Washington) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C / mm)  |  Imperial (°F / inches)

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How hot is it in Washington in September?

Daytime temperatures usually reach 26°C in Washington in September with low heat and humidity, falling to 15°C at night.

How sunny is it in Washington in September?

There are normally 7 hours of bright sunshine each day in Washington in September - that's 60% of daylight hours.

Does it rain in Washington in September?

There are usually 7 days with some rain in Washington in September and the average monthly rainfall is 87mm.

What is the chance of a hurricane in Washington in September?

On average less than 1 day in September in Washington is likely to be affected by the passage of one or more tropical storms.

Washington September sunrise & sunset times

Browse the sunrise and sunset times for Washington in September 2025. Select a month to view Washington sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:37 18:38
Monday, 15th September 2025 05:50 18:16
Tuesday, 30th September 2025 06:03 17:52

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