St Ives weather in September 2025

Q: How warm is it in St Ives in September?

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

Q: How sunny is it in St Ives in September?

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

Q: How warm is the sea around St Ives in September?

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

Q: Does it rain in St Ives in September?

There are usually 16 days with some rain in St Ives in September and the average monthly rainfall is 83mm.

Expect daytime maximum temperatures of 17°C in St Ives in September based on long-term weather averages. There are 5 hours of sunshine per day on average with 16 days with some rainfall and typically 83 mm of rainfall in the month.

17
17°C max day temperature
5
5 hours of sunshine per day
16
16 days with some rainfall
11
11°C min night temperature
13
13 hours of daylight per day
0
No heat & humidity
83
83 mm of monthly rainfall
4
4 (Moderate) UV index
16
16°C sea temperature

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The September weather guide for England (St Ives) 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)