Weymouth weather in September 2025

Q: How hot is it in Weymouth in September?

Daytime temperatures usually reach 18°C in Weymouth in September, falling to 11°C at night.

Q: How sunny is it in Weymouth in September?

There are normally 5 hours of bright sunshine each day in Weymouth in September - that's 42% of daylight hours.

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

The average sea temperature around Weymouth in September is 17°C.

Q: Does it rain in Weymouth in September?

There are usually 13 days with some rain in Weymouth in September and the average monthly rainfall is 68mm.

Expect daytime maximum temperatures of 18°C in Weymouth 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 68 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
11
11°C min night temperature
13
13 hours of daylight per day
0
No heat & humidity
68
68 mm of monthly rainfall
4
4 (Moderate) UV index
17
17°C sea temperature

More about Weymouth

Weymouth by month

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Recommended for England

Marriott discount code: up to 20% off hotel stays

Discount Code

Save up to 20% when you book long stays with Marriott
20% off - 4-6 nights, 15% off 3 nights
Book hotels in Europe, the Middle East & Africa

Show discount code

******UK8

Redeem Marriott discount code >>

View all Marriott offers

The September weather guide for England (Weymouth) 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)