Temperatures in December
It's warm in December in Portsmouth with an average temperature of 29°C. Temperatures this month range from a low of 29°C to a high of 30°C. At night, you can expect temperatures between 22°C and 23°C.
Max and Min Temperatures per Day
This chart shows the daily maximum and minimum temperatures in degrees Celsius for Portsmouth in December. The red line indicates the max temperatures, and the blue line shows the minimums.
Start of December
The month of December starts in Portsmouth with hot temperatures, averaging around 30°C during the day and nights close to 23°C. Plenty of days with a chance of precipitation.
Mid-December
By mid-December, the average daytime temperature stays the same at 30°C, with nights close to 23°C. During this part of the month, you can expect regular precipitation, but there’ll also be some sunny days.
End of December
By the end of December, the average daytime temperature in Portsmouth will be around 29°C, with nights close to 23°C. There’s regular precipitation, but with a bit of luck, you’ll also get some dry and sunny days.
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Precipitation in December
In December, there is an average of 176 mm of precipitation, spread over 20 days. The wind speed is around 4 Bft, mostly coming from the Southeast.
The average precipitation chance this month is 65% per day.
Precipitation Chance
This chart shows the daily precipitation chance (in percentages) in December for Portsmouth. 0% means it never rained on that day in the past 10 years, and 100% means it rained every day. All values in between represent the average chance of precipitation on that day.
Portsmouth in December |
London | ||
|---|---|---|---|
 Average Temperature |
29°C | 9°C | |
 High Temp |
30°C | 11°C | |
| Low Temp |
29°C | 8°C | |
 Total Precipitation |
176 mm | 67 mm | |
| Rainy Days |
20 days | 10 days | |
November
UV index
The UV index is a maximum of 8 this month. That's a very high value on the intensity scale of 1 to 11. Unprotected skin can burn within 10-15 minutes.
Is December a good time to visit Portsmouth?
After some sun? Then December isn’t the best time to be in Portsmouth. The temperature is pleasant, but there’s too much chance of rain this month.
Temperature records for Portsmouth in December
With 31°C, Portsmouth hit the highest temperature in the last 10 years in December 2023. The lowest daytime temperature in this month was 25°C in 2021. The extreme night temperatures ranged from a low of 18°C to a high of 26°C.
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Daily Temperature in December in Portsmouth
This chart shows the average daily temperatures, both day and night, for each day in December in Portsmouth, measured in degrees Celsius. The red line represents the maximum temperatures, while the blue line shows the minimums. The days of the month are displayed at the bottom of the chart. The data, based on historical observations, gives an overview of the average daily temperatures during this month.
Daily Precipitation in December in Portsmouth
The chart below shows the average daily precipitation in December for Portsmouth, measured in millimetres over the past years. Precipitation is always measured as water, even if it’s snow or hail. The days of the month are shown at the bottom of the chart.
A low average precipitation means that the chance of rain on that day is usually small, while a higher average suggests that rain is more likely. But it’s still an average, so each day can be different. Based on historical weather data for December, you can expect around 20 days of rain in Portsmouth.
Daily UV Index in December in Portsmouth
This chart shows the average daily UV index in December in Portsmouth, with the UV index ranging from 0 to a maximum of 11. The bottom of the chart shows the days of the month. Based on historical data, this chart provides an idea of the daily UV radiation levels you can expect.
Temperature in December in Portsmouth Over the Years
This chart shows the average temperature in December in Portsmouth, measured in degrees Celsius, over the past years.
Total Precipitation in December in Portsmouth Over the Years
This chart shows the average precipitation in December in Portsmouth, measured in millimetres over the past years. Precipitation is always measured as water, even if it’s snow or hail.
Daily climate in December for Portsmouth
Click on a specific day in December for detailed info on the typical weather on that day in Portsmouth. Check out the historical temperatures and precipitation over the past 10 years on this day.
Weather experiences in December in Portsmouth
Have you been to Portsmouth in December?
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Average Weather in Portsmouth by Month
Click on a month below to see detailed weather info for Portsmouth. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.
Or check out the climate of Portsmouth for all months at once
