Portsmouth weather in May 2025

Expect 86°F daytime maximum temperatures in the shade with on average 8 hours of sunshine per day in Portsmouth in May. Check more long-term weather averages for Portsmouth in May before you book your next holiday to Dominica in 2025/2026.

  • 86°F maximum daytime temperature in May in Portsmouth86
    86°F max day temperature
  • 8 hours of sunshine per day
  • 17 days with some rainfall in May in Portsmouth17
    17 days with some rainfall
  • 73°F minimum night-time temperature in May in Portsmouth73
    73°F min night temperature
  • 13 hours of daylight per day in May in Portsmouth13
    13 hours of daylight per day
  • High heat & humidity in May in PortsmouthH
    High heat & humidity
  • 7.0 inches monthly rainfall in May in Portsmouth7.0
    7.0 inches of monthly rainfall
  • UV (maximum) index 11+ (Extreme) in May in Portsmouth11
    11+ (Extreme) UV index
  • 81°F sea temperature in May in Portsmouth81
    81°F sea temperature

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The May weather guide for Dominica (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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How hot is it in Portsmouth in May?

Daytime temperatures usually reach 86°F in Portsmouth in May with high heat and humidity, falling to 73°F at night.

How sunny is it in Portsmouth in May?

There are normally 8 hours of bright sunshine each day in Portsmouth in May - that's 61% of daylight hours.

How warm is the sea around Portsmouth in May?

The average sea temperature around Portsmouth in May is 81°F.

Does it rain in Portsmouth in May?

There are usually 17 days with some rain in Portsmouth in May and the average monthly rainfall is 7.0 inches.

Portsmouth May sunrise & sunset times

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

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Thursday, 1st May 2025 05:42 18:24
Friday, 16th May 2025 05:36 18:28
Saturday, 31st May 2025 05:34 18:33

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