United States weather in September

Check the Weather in the United States in September before you book your next holiday. This gives the best indication of the weather in September and includes figures for temperature, sunshine and rainfall. The United States september weather guide shown below is for Washington.

  • 26°C maximum daytime temperature in September in United States (Washington)26
    26°C max day temperature
  • 7 hours of sunshine per day (60% of daylight hours) in September in United States7
    7 hours of sunshine per day
  • 7 days with some rainfall in September in United States (Washington)7
    7 days with some rainfall
  • 15°C minimum night-time temperature in September in United States (Washington)15
    15°C min night temperature
  • 12 hours of daylight per day in September in United States (Washington)12
    12 hours of daylight per day
  • Low heat & humidity in September in United States (Washington)L
    Low heat & humidity
  • 87 mm monthly rainfall in September in United States (Washington)87
    87 mm of monthly rainfall
  • UV (maximum) index 7 (High) in September in United States (Washington)7
    7 (High) UV index

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

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