Portsmouth weather in August 2025

Expect 70°F 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.

  • 70°F maximum daytime temperature in August in Portsmouth70
    70°F max day temperature
  • 7 hours of sunshine per day
  • 10 days with some rainfall in August in Portsmouth10
    10 days with some rainfall
  • 57°F minimum night-time temperature in August in Portsmouth57
    57°F min night temperature
  • 14 hours of daylight per day in August in Portsmouth14
    14 hours of daylight per day
  • No heat & humidity in August in Portsmouth0
    No heat & humidity
  • 2.1 inches monthly rainfall in August in Portsmouth2.1
    2.1 inches of monthly rainfall
  • UV (maximum) index 6 (High) in August in Portsmouth6
    6 (High) UV index
  • 64°F sea temperature in August in Portsmouth64
    64°F 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)  |  Imperial (°F)

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More about England

How hot is it in Portsmouth in August?

Daytime temperatures usually reach 70°F in Portsmouth in August, falling to 57°F 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 64°F.

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 2.1 inches.

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.

JanFebMarAprMayJunJulAugSepOctNovDec

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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