Portsmouth weather in August 2025

Expect 21°C daytime maximum temperatures in the shade with on average 7 hours of sunshine per day in Portsmouth in August. Check more long-term weather averages for Portsmouth in August before you book your next holiday to England in 2025/2026.

21
21°C max day temperature
7
7 hours of sunshine per day
10
10 days with some rainfall
14
14°C min night temperature
14
14 hours of daylight per day
0
No heat & humidity
53
53 mm of monthly rainfall
6
6 (High) UV index
18
18°C sea temperature

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The August weather guide for England (Portsmouth) 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)

More about England

How hot is it in Portsmouth in August?

Daytime temperatures usually reach 21°C in Portsmouth in August, falling to 14°C at night.

How sunny is it in Portsmouth in August?

There are normally 7 hours of bright sunshine each day in Portsmouth in August - that's 48% of daylight hours.

How warm is the sea around Portsmouth in August?

The average sea temperature around Portsmouth in August is 18°C.

Does it rain in Portsmouth in August?

There are usually 10 days with some rain in Portsmouth in August and the average monthly rainfall is 53mm.

Portsmouth August sunrise & sunset times

Browse the sunrise and sunset times for Portsmouth in August 2025. Select a month to view Portsmouth sunrise and sunset times for the next 12 months.

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

Date	Sunrise times	Sunset times
Friday, 1st August 2025	04:31	19:49
Saturday, 16th August 2025	04:54	19:22
Sunday, 31st August 2025	05:17	18:51

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