Weather in January
Temperature
During January and February, Portsmouth experiences its lowest temperatures, averaging a high-temperature of 8.2°C (46.8°F).Rainfall
In Portsmouth, in January, during 11.2 rainfall days, 69mm (2.72") of precipitation is typically accumulated. In Portsmouth, during the entire year, the rain falls for 103.4 days and collects up to 699mm (27.52") of precipitation.Sea temperature
In January, the average sea temperature in Portsmouth, United Kingdom, is 9.6°C (49.3°F).Note: Caution: 9.6°C (49.3°F) temperatures below 10°C (50°F) during swimming can result in intense cold shock and quickened breathing.
Daylight
In January, the average length of the day is 8h and 32min.On the first day of January, sunrise is at 8:06 am and sunset at 4:08 pm. On the last day of the month, sunrise is at 7:42 am and sunset at 4:53 pm GMT.
Sunshine
The average sunshine in January is 2.2h.UV index
The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 1. A UV Index reading of 2, and below, represents a low threat to health from exposure to the Sun's UV radiation for the average person.Note: In January, the maximum UV index of 1 transforms into these recommendations:
It is important to always shield children, babies, and individuals with sensitive skin from prolonged exposure to the sun. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. A wide-brimmed hat provides unparalleled sun protection for sensitive areas like the eyes, ears, and neck.
Frequently asked questions
What time of the year is the coldest in Portsmouth?
What is the average January temperature in Portsmouth?
How much does it rain in Portsmouth in January?
What is the water temperature in January in Portsmouth?
What is the average length of the day in January in Portsmouth?
When are sunrise and sunset in January in Portsmouth?
How long on average sun shines in January in Portsmouth?
What are the months with the lowest UV index in Portsmouth?
What is the UV index reading in January in Portsmouth?
Average temperature in January
Portsmouth, United Kingdom
- Average high temperature in January: 8.2°C
The warmest months (with the highest average high temperature) are July and August (21.4°C).
The months with the lowest average high temperature are January and February (8.2°C).
- Average low temperature in January: 3.4°C
The month with the highest average low temperature is August (14.3°C).
The coldest month (with the lowest average low temperature) is February (2.8°C).
Average rainfall in January
Portsmouth, United Kingdom
- Average rainfall in January: 68.8mm
The wettest month (with the highest rainfall) is October (86.2mm).
The driest month (with the least rainfall) is June (42mm).
Average rainfall days in January
Portsmouth, United Kingdom
- Average rainfall days in January: 11.2 days
The months with the highest number of rainy days are January and December (11.2 days).
The month with the least rainy days is July (5.4 days).
Average sea temperature in January
Portsmouth, United Kingdom
- Average sea temperature in January: 9.6°C
The best month for swimming (with the highest average sea temperature) is September (17.3°C).
The coldest month (with the lowest average sea temperature) is March (8.6°C).
Average daylight in January /
Average sunshine in January
Portsmouth, United Kingdom
- Average daylight in January: 8h and 3min
The month with the longest days is June (Average daylight: 16h and 24min).
The month with the shortest days is December (Average daylight: 8h and 0min).
- Average sunshine in January: 2h and 1min
The month with the most sunshine is July (Average sunshine: 8h and 24min).
The month with the least sunshine is December (Average sunshine: 2h and 0min).
Average UV index in January
Portsmouth, United Kingdom
- Average UV index in January: 1
The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 1).
Portsmouth, United Kingdom
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