Portsmouth
December
Weather in Portsmouth for December 2025
Your guide to Portsmouth weather in December - trends and predictions
So far, December 2025 in Portsmouth is slightly warmer than the historical average by 0.8 °C.
Expect cooler weather in the next days in Portsmouth with the forecast suggesting a temperature of 8.8 °C, lower than the historical average.
In general, the average temperature in Portsmouth at the beginning of December is 10.4 °C. As the month progressed, temperatures tended to moderately fall, reaching an average of 9.4 °C by the end of December.
Portsmouth experiences heavy rainfall in December, with over 20 rainy days and an average total precipitation 119.3 mm.
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Temperatures
Rain 🌧️
More
7
Dry days
24
Rainy days
0
Snow days
10°/7°
Temperatures
38 km/h
Avg max wind
84 %
Avg humidity
Portsmouth Weather December
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Temperatures trend during December in Portsmouth
See the weather trend as well as the moving average line
December weather in Portsmouth day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Dec. |  Light snow | 10° /7° | 4.1 mm | 3 | |
| 2 Dec. |  Light rain shower | 9° /5° | 2.2 mm | 3 | |
| 3 Dec. | Light rain shower | 9° /5° | 9.9 mm | 3 | |
| 4 Dec. | Light rain shower | 11° /6° | 8.9 mm | 3 | |
| 5 Dec. | Light rain shower | 11° /6° | 7.3 mm | 3 | |
| 6 Dec. | Patchy rain possible | 10° /6° | 1.2 mm | 3 | |
| 7 Dec. |  Moderate rain | 13° /7° | 10.3 mm | 3 | |
| 8 Dec. | Light rain shower | 10° /8° | 4.5 mm | 3 | |
| 9 Dec. | Light rain shower | 11° /9° | 9.6 mm | 3 | |
| 10 Dec. |  Light drizzle | 11° /8° | 2.1 mm | 3 | |
| 11 Dec. |  Overcast | 10° /7° | 0.1 mm | 3 | |
| 12 Dec. | Light rain shower | 10° /7° | 5.8 mm | 3 | |
| 13 Dec. | Light drizzle | 9° /5° | 1.7 mm | 2 | |
| 14 Dec. | Light drizzle | 8° /4° | 0.5 mm | 2 | |
| 15 Dec. | Patchy rain possible | 11° /10° | 0.5 mm | 0 | |
| 16 Dec. |  Partly cloudy | 11° /6° | 0 mm | 0 | |
| 17 Dec. |  Sunny | 9° /5° | 0 mm | 0.1 | |
| 18 Dec. | Patchy rain possible | 12° /8° | 0.8 mm | 0.1 | |
| 19 Dec. | Patchy rain possible | 10° /7° | 0.5 mm | 2 | |
| 20 Dec. | Patchy rain possible | 8° /5° | 0.1 mm | 2 | |
| 21 Dec. | Patchy rain possible | 8° /6° | 5 mm | 2 | |
| 22 Dec. | Partly cloudy | 7° /5° | 0 mm | 3 | |
| 23 Dec. | Patchy rain possible | 9° /6° | 0.1 mm | 2 | |
| 24 Dec. | Sunny | 8° /6° | 0 mm | 3 | |
| 25 Dec. | Patchy rain possible | 10° /7° | 0.6 mm | 2 | |
| 26 Dec. | Sunny | 6° /4° | 0 mm | 3 | |
| 27 Dec. | Sunny | 6° /3° | 0 mm | 2 | |
| 28 Dec. |  Heavy rain at times | 11° /8° | 3.7 mm | 3 | |
| 29 Dec. | Partly cloudy | 10° /7° | 0.5 mm | 3 | |
| 30 Dec. | Patchy rain possible | 11° /7° | 6.1 mm | 3 | |
| 31 Dec. |  Moderate or heavy rain shower | 12° /8° | 12.4 mm | 3 | |
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Important Notice
Our weather forecast for Portsmouth in December is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Portsmouth forecast closer to your planned date for the most up-to-date weather information.
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Portsmouth in December - FAQ
What are the expected maximum and minimum temperatures in Portsmouth during December?
During December, expect a variety of temperatures with highs around 10° and lows near 7°, suitable for diverse activities and preferences.
How much rainfall should be expected in Portsmouth during December?
Significant rainfall exceeding 119.3 mm is expected in Portsmouth during December, occurring over more than 24 days. Preparing for wet conditions is recommended in your planning.
Will it snow in Portsmouth in December 2025?
Portsmouth typically sees 0.015 cm of snowfall during December.
What are the typical wind conditions in Portsmouth during December?
The average wind speed in Portsmouth during December is 38 km/h, suggesting breezy to windy conditions, depending on your activities.
December rainfall patterns in Portsmouth
Explore the daily rainfall trends and prepare for Portsmouths December weather 💧
Typically, Portsmouth has 24 rainy days in December with a total of 119.3 mm of rainfall.
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