D.C. weather in September 2025

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

  • 26°C maximum daytime temperature in September in D.C. (Washington)26
    26°C max day temperature
  • 7 hours of sunshine per day
  • 7 days with some rainfall in September in D.C. (Washington)7
    7 days with some rainfall
  • 15°C minimum night-time temperature in September in D.C. (Washington)15
    15°C min night temperature
  • 12 hours of daylight per day in September in D.C. (Washington)12
    12 hours of daylight per day
  • Low heat & humidity in September in D.C. (Washington)L
    Low heat & humidity
  • 87 mm monthly rainfall in September in D.C. (Washington)87
    87 mm of monthly rainfall
  • UV (maximum) index 7 (High) in September in D.C. (Washington)7
    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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More about the USA

How hot is it in D.C. in September?

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

How sunny is it in D.C. in September?

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

Does it rain in D.C. in September?

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

What is the chance of a hurricane in D.C. in September?

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

D.C. September sunrise & sunset times

Browse the sunrise and sunset times for D.C. in September 2025. Select a month to view D.C. sunrise and sunset times for the next 12 months. The D.C. sunrise and sunset times shown below are for Washington.

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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