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Wilmington weather in September 2025
Expect 25°C daytime maximum temperatures in the shade with on average 7 hours of sunshine per day in Wilmington in September. Check more long-term weather averages for Wilmington in September before you book your next holiday to Delaware in 2025/2026.
- 2525°C max day temperature
- 7 hours of sunshine per day
- 88 days with some rainfall
- 1414°C min night temperature
- 1212 hours of daylight per day
- LLow heat & humidity
- 9797 mm of monthly rainfall
- 66 (High) UV index
- 2222°C sea temperature
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Recommended for Delaware
The September weather guide for Delaware (Wilmington) 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)
More about the USA
How hot is it in Wilmington in September?
Daytime temperatures usually reach 25°C in Wilmington in September with low heat and humidity, falling to 14°C at night.
How sunny is it in Wilmington in September?
There are normally 7 hours of bright sunshine each day in Wilmington in September - that's 59% of daylight hours.
How warm is the sea around Wilmington in September?
The average sea temperature around Wilmington in September is 22°C.
Does it rain in Wilmington in September?
There are usually 8 days with some rain in Wilmington in September and the average monthly rainfall is 97mm.
What is the chance of a hurricane in Wilmington in September?
On average less than 1 day in September in Wilmington is likely to be affected by the passage of one or more tropical storms.
Wilmington September sunrise & sunset times
Browse the sunrise and sunset times for Wilmington in September 2025. Select a month to view Wilmington sunrise and sunset times for the next 12 months.
JanFebMarAprMayJunJulAugSepOctNovDec
Date | Sunrise times | Sunset times |
---|---|---|
Monday, 1st September 2025 | 05:31 | 18:33 |
Monday, 15th September 2025 | 05:44 | 18:10 |
Tuesday, 30th September 2025 | 05:58 | 17:46 |
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