USA weather in September 2025

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

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

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The September weather guide for USA (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.

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Below are average maximum temperatures at popular countries, regions and places in the USA in September. Select a holiday destination to see more weather parameters.

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

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More about the USA

How hot is it in the USA in September?

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

How sunny is it in the USA in September?

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

Does it rain in the USA in September?

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

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

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

USA September sunrise & sunset times

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