Dover weather in September 2025

Expect 27°C daytime maximum temperatures in the shade with on average 8 hours of sunshine per day in Dover in September. Check more long-term weather averages for Dover in September before you book your next holiday to Delaware in 2025/2026.

  • 27°C maximum daytime temperature in September in Dover27
    27°C max day temperature
  • 8 hours of sunshine per day
  • 8 days with some rainfall in September in Dover8
    8 days with some rainfall
  • 14°C minimum night-time temperature in September in Dover14
    14°C min night temperature
  • 12 hours of daylight per day in September in Dover12
    12 hours of daylight per day
  • Low heat & humidity in September in DoverL
    Low heat & humidity
  • 102 mm monthly rainfall in September in Dover102
    102 mm of monthly rainfall
  • UV (maximum) index 7 (High) in September in Dover7
    7 (High) UV index

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The September weather guide for Delaware (Dover) 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 Dover in September?

Daytime temperatures usually reach 27°C in Dover in September with low heat and humidity, falling to 14°C at night.

How sunny is it in Dover in September?

There are normally 8 hours of bright sunshine each day in Dover in September - that's 60% of daylight hours.

Does it rain in Dover in September?

There are usually 8 days with some rain in Dover in September and the average monthly rainfall is 102mm.

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

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

Dover September sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:31 18:32
Monday, 15th September 2025 05:44 18:10
Tuesday, 30th September 2025 05:57 17:46

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