Tristan da Cunha weather in September 2025

Q: How warm is it in Tristan da Cunha in September?

Daytime temperatures usually reach 13°C in Tristan da Cunha in September, falling to 9°C at night.

Q: How sunny is it in Tristan da Cunha in September?

There are normally 4 hours of bright sunshine each day in Tristan da Cunha in September - that's 34% of daylight hours.

Q: How warm is the sea around Tristan da Cunha in September?

The average sea temperature around Tristan da Cunha in September is 13°C.

Q: Does it rain in Tristan da Cunha in September?

There are usually 19 days with some rain in Tristan da Cunha in September and the average monthly rainfall is 135mm.

Expect 55°F daytime maximum temperatures in the shade with on average 4 hours of sunshine per day in Tristan da Cunha in September. Check more long-term weather averages for Tristan da Cunha in September before you book your next holiday to St Helena & Islands in 2025/2026.

55
55°F max day temperature
4
4 hours of sunshine per day
19
19 days with some rainfall
48
48°F min night temperature
12
12 hours of daylight per day
0
No heat & humidity
5.3
5.3 inches of monthly rainfall
5
5 (Moderate) UV index
55
55°F sea temperature

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The September weather guide for St Helena & Islands (Tristan da Cunha) 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)

How warm is it in Tristan da Cunha in September?

Daytime temperatures usually reach 55°F in Tristan da Cunha in September, falling to 48°F at night.

How sunny is it in Tristan da Cunha in September?

There are normally 4 hours of bright sunshine each day in Tristan da Cunha in September - that's 34% of daylight hours.

How warm is the sea around Tristan da Cunha in September?

The average sea temperature around Tristan da Cunha in September is 55°F.

Does it rain in Tristan da Cunha in September?

There are usually 19 days with some rain in Tristan da Cunha in September and the average monthly rainfall is 5.3 inches.

Tristan da Cunha September sunrise & sunset times

Browse the sunrise and sunset times for Tristan da Cunha in September 2025. Select a month to view Tristan da Cunha sunrise and sunset times for the next 12 months.

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