Grimsby weather in September 2025

Q: How hot is it in Grimsby in September?

Daytime temperatures usually reach 18°C in Grimsby in September, falling to 10°C at night.

Q: How sunny is it in Grimsby in September?

There are normally 5 hours of bright sunshine each day in Grimsby in September - that's 36% of daylight hours.

Q: How warm is the sea around Grimsby in September?

The average sea temperature around Grimsby in September is 14°C.

Q: Does it rain in Grimsby in September?

There are usually 13 days with some rain in Grimsby in September and the average monthly rainfall is 53mm.

Expect daytime maximum temperatures of 18°C in Grimsby, England in September based on long-term weather averages. There are 5 hours of sunshine per day on average with 13 days with some rainfall and typically 53 mm of rainfall in the month.

18
18°C max day temperature
5
5 hours of sunshine per day
13
13 days with some rainfall
10
10°C min night temperature
13
13 hours of daylight per day
0
No heat & humidity
53
53 mm of monthly rainfall
4
4 (Moderate) UV index
14
14°C sea temperature

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The September weather guide for England (Grimsby) 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)