Plymouth weather in September 2025

Q: How warm is it in Plymouth in September?

Daytime temperatures usually reach 17°C in Plymouth in September, falling to 11°C at night.

Q: How sunny is it in Plymouth in September?

There are normally 5 hours of bright sunshine each day in Plymouth in September - that's 41% of daylight hours.

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

The average sea temperature around Plymouth in September is 16°C.

Q: Does it rain in Plymouth in September?

There are usually 15 days with some rain in Plymouth in September and the average monthly rainfall is 102mm.

Expect daytime maximum temperatures of 17°C in Plymouth, England in September based on long-term weather averages. There are 5 hours of sunshine per day on average with 15 days with some rainfall and typically 102 mm of rainfall in the month.

17
17°C max day temperature
5
5 hours of sunshine per day
15
15 days with some rainfall
11
11°C min night temperature
13
13 hours of daylight per day
0
No heat & humidity
102
102 mm of monthly rainfall
4
4 (Moderate) UV index
16
16°C sea temperature

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The September weather guide for England (Plymouth) 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)