Tristan da Cunha weather in December 2025

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

Daytime temperatures usually reach 17°C in Tristan da Cunha in December, falling to 12°C at night.

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

There are normally 4 hours of bright sunshine each day in Tristan da Cunha in December - that's 29% of daylight hours.

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

The average sea temperature around Tristan da Cunha in December is 16°C.

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

There are usually 17 days with some rain in Tristan da Cunha in December and the average monthly rainfall is 115mm.

Expect 17°C daytime maximum temperatures in the shade with on average 4 hours of sunshine per day in Tristan da Cunha in December. Check more long-term weather averages for Tristan da Cunha in December before you book your next holiday to St Helena & Islands in 2025/2026.

17
17°C max day temperature
4
4 hours of sunshine per day
17
17 days with some rainfall
12
12°C min night temperature
15
15 hours of daylight per day
0
No heat & humidity
115
115 mm of monthly rainfall
11
11 (Extreme) UV index
16
16°C sea temperature

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The December 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 / mm) | Imperial (°F / inches)

How warm is it in Tristan da Cunha in December?

Daytime temperatures usually reach 17°C in Tristan da Cunha in December, falling to 12°C at night.

How sunny is it in Tristan da Cunha in December?

There are normally 4 hours of bright sunshine each day in Tristan da Cunha in December - that's 29% of daylight hours.

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

The average sea temperature around Tristan da Cunha in December is 16°C.

Does it rain in Tristan da Cunha in December?

There are usually 17 days with some rain in Tristan da Cunha in December and the average monthly rainfall is 115mm.

Tristan da Cunha December sunrise & sunset times

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

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec