Portsmouth weather in July 2025

Q: How hot is it in Portsmouth in July?

Daytime temperatures usually reach 21°C in Portsmouth in July, falling to 13°C at night.

Q: How sunny is it in Portsmouth in July?

There are normally 8 hours of bright sunshine each day in Portsmouth in July - that's 47% of daylight hours.

Q: How warm is the sea around Portsmouth in July?

The average sea temperature around Portsmouth in July is 17°C.

Q: Does it rain in Portsmouth in July?

There are usually 9 days with some rain in Portsmouth in July and the average monthly rainfall is 39mm.

Expect daytime maximum temperatures of 21°C in Portsmouth, England in July based on long-term weather averages. There are 8 hours of sunshine per day on average.

21
21°C max day temperature
8
8 hours of sunshine per day
9
9 days with some rainfall
13
13°C min night temperature
16
16 hours of daylight per day
0
No heat & humidity
39
39 mm of monthly rainfall
6
6 (High) UV index
17
17°C sea temperature

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The July 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)