Portsmouth weather in May 2026

Expect daytime maximum temperatures of 30°C in Portsmouth, Dominica in May and high heat and humidity based on long-term weather averages. There are 8 hours of sunshine per day on average with 17 days with some rainfall and typically 177 mm of rainfall in the month.

  • 30°C maximum daytime temperature in May in Portsmouth30
    30°C max day temperature
  • 8 hours of sunshine per day
  • 17 days with some rainfall in May in Portsmouth17
    17 days with some rainfall
  • 23°C minimum night-time temperature in May in Portsmouth23
    23°C 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
  • 177 mm monthly rainfall in May in Portsmouth177
    177 mm of monthly rainfall
  • UV (maximum) index 11+ (Extreme) in May in Portsmouth11
    11+ (Extreme) UV index
  • 27°C sea temperature in May in Portsmouth27
    27°C 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 / mm)  |  Imperial (°F / inches)

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How hot is it in Portsmouth in May?

Daytime temperatures usually reach 31°C in Portsmouth in May with high heat and humidity, falling to 23°C 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 28°C.

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 137mm.

Portsmouth May sunrise & sunset times

Browse the sunrise and sunset times for Portsmouth in May 2026. Select a month to view Portsmouth sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Friday, 1st May 2026 05:42 18:24
Saturday, 16th May 2026 05:36 18:28
Sunday, 31st May 2026 05:34 18:33

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