West Sussex weather in September 2025

Q: How hot is it in West Sussex in September?

Daytime temperatures usually reach 18°C in Bognor Regis, West Sussex in September, falling to 11°C at night.

Q: How sunny is it in West Sussex in September?

There are normally 6 hours of bright sunshine each day in Bognor Regis, West Sussex in September - that's 44% of daylight hours.

Q: How warm is the sea around West Sussex in September?

The average sea temperature around Bognor Regis, West Sussex in September is 17°C.

Q: Does it rain in West Sussex in September?

There are usually 11 days with some rain in Bognor Regis, West Sussex in September and the average monthly rainfall is 65mm.

Expect 18°C daytime maximum temperatures in the shade with on average 6 hours of sunshine per day in West Sussex in September. Check more long-term weather averages for West Sussex in September before you book your next holiday to West Sussex in 2025/2026.

18
18°C max day temperature
6
6 hours of sunshine per day
11
11 days with some rainfall
11
11°C min night temperature
13
13 hours of daylight per day
0
No heat & humidity
65
65 mm of monthly rainfall
4
4 (Moderate) UV index
17
17°C sea temperature

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The September weather guide for West Sussex (Bognor Regis) 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.

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Metric (°C / mm) | Imperial (°F / inches)

More about the UK

How hot is it in West Sussex in September?

Daytime temperatures usually reach 18°C in Bognor Regis, West Sussex in September, falling to 11°C at night.

How sunny is it in West Sussex in September?

There are normally 6 hours of bright sunshine each day in Bognor Regis, West Sussex in September - that's 44% of daylight hours.

How warm is the sea around West Sussex in September?

The average sea temperature around Bognor Regis, West Sussex in September is 17°C.

Does it rain in West Sussex in September?

There are usually 11 days with some rain in Bognor Regis, West Sussex in September and the average monthly rainfall is 65mm.

West Sussex September sunrise & sunset times

Browse the sunrise and sunset times for West Sussex in September 2025. Select a month to view West Sussex sunrise and sunset times for the next 12 months. The West Sussex sunrise and sunset times shown below are for Bognor Regis.

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