Portsmouth weather in January 2026

Q: How cold is it in Portsmouth in January?

Daytime temperatures usually reach 7°C in Portsmouth in January, falling to 3°C at night.

Q: How sunny is it in Portsmouth in January?

There are normally 2 hours of bright sunshine each day in Portsmouth in January - that's 23% of daylight hours.

Q: Is the sea cold around Portsmouth in January?

The average sea temperature around Portsmouth in January is 8°C.

Q: Does it rain in Portsmouth in January?

There are usually 17 days with some rain in Portsmouth in January and the average monthly rainfall is 79mm.

Expect daytime maximum temperatures of 45°F in Portsmouth, England in January based on long-term weather averages. There are 2 hours of sunshine per day on average with 17 days with some rainfall and typically 3.1 inches of rainfall in the month.

45
45°F max day temperature
2
2 hours of sunshine per day
17
17 days with some rainfall
37
37°F min night temperature
9
9 hours of daylight per day
0
No heat & humidity
3.1
3.1 inches of monthly rainfall
1
1 (Low) UV index
46
46°F sea temperature

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The January weather guide for England (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)

More about England

How cold is it in Portsmouth in January?

Daytime temperatures usually reach 45°F in Portsmouth in January, falling to 37°F at night.

How sunny is it in Portsmouth in January?

There are normally 2 hours of bright sunshine each day in Portsmouth in January - that's 23% of daylight hours.

How warm is the sea around Portsmouth in January?

The average sea temperature around Portsmouth in January is 46°F.

Does it rain in Portsmouth in January?

There are usually 17 days with some rain in Portsmouth in January and the average monthly rainfall is 3.1 inches.

Portsmouth January sunrise & sunset times

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

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