Penzance weather in September 2025

Q: How warm is it in Penzance in September?

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

Q: How sunny is it in Penzance in September?

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

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

The average sea temperature around Penzance in September is 15°C.

Q: Does it rain in Penzance in September?

There are usually 15 days with some rain in Penzance in September and the average monthly rainfall is 89mm.

Expect daytime maximum temperatures of 17°C in Penzance, 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 89 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
89
89 mm of monthly rainfall
4
4 (Moderate) UV index
15
15°C sea temperature

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The September weather guide for England (Penzance) 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)