Delaware weather in September 2025

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

  • 27°C maximum daytime temperature in September in Delaware (Dover)27
    27°C max day temperature
  • 8 hours of sunshine per day
  • 8 days with some rainfall in September in Delaware (Dover)8
    8 days with some rainfall
  • 14°C minimum night-time temperature in September in Delaware (Dover)14
    14°C min night temperature
  • 12 hours of daylight per day in September in Delaware (Dover)12
    12 hours of daylight per day
  • Low heat & humidity in September in Delaware (Dover)L
    Low heat & humidity
  • 102 mm monthly rainfall in September in Delaware (Dover)102
    102 mm of monthly rainfall
  • UV (maximum) index 7 (High) in September in Delaware (Dover)7
    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.

Top Delaware destinations

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

All Delaware destinations

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

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How hot is it in Delaware in September?

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

How sunny is it in Delaware in September?

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

Does it rain in Delaware in September?

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

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

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

Delaware September sunrise & sunset times

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

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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