St Helena weather in May 2025

Q: How hot is it in St Helena in May?

Daytime temperatures usually reach 21°C in St Helena in May, falling to 17°C at night.

Q: How warm is the sea around St Helena in May?

The average sea temperature around St Helena in May is 24°C.

Q: Does it ever rain in St Helena in May?

There are usually 14 days with some rain in St Helena in May and the average monthly rainfall is 71mm.

Expect daytime maximum temperatures of 21°C in St Helena in May based on long-term weather averages. There are 14 days with some rainfall and typically 71 mm of rainfall in the month.

21
21°C max day temperature
14
14 days with some rainfall
17
17°C min night temperature
11
11 hours of daylight per day
0
No heat & humidity
71
71 mm of monthly rainfall
9
9 (Very High) UV index
24
24°C sea temperature

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The May weather guide for St Helena & Islands (St Helena) 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)