Click on a day for an hourly weather forecast
The temperatures in Portsmouth in December are quite cold with temperatures between 5°C and 11°C, warm clothes are a must.
You can expect about 3 to 8 days of rain in Portsmouth during the month of December. It’s a good idea to bring along your umbrella so that you don’t get caught in poor weather.
Please note that Portsmouth can expect a few days of snow in December.
Our weather forecast can give you a great sense of what weather to expect in Portsmouth in December 2024.
If you’re planning to visit Portsmouth in the near future, we highly recommend that you review the 14 day weather forecast for Portsmouth before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | 8° / 2° | 5 | 23 | 3 | 73 mm | Bad | Portsmouth in January |
| February | 9° / 3° | 6 | 20 | 3 | 77 mm | Bad | Portsmouth in February |
| March | 13° / 6° | 7 | 23 | 1 | 87 mm | Bad | Portsmouth in March |
| April | 18° / 11° | 5 | 25 | 0 | 90 mm | Good | Portsmouth in April |
| May | 23° / 16° | 7 | 24 | 0 | 127 mm | Good | Portsmouth in May |
| June | 28° / 21° | 7 | 24 | 0 | 120 mm | Good | Portsmouth in June |
| July | 31° / 23° | 7 | 24 | 0 | 142 mm | Ok | Portsmouth in July |
| August | 30° / 23° | 7 | 24 | 0 | 158 mm | Ok | Portsmouth in August |
| September | 27° / 21° | 5 | 25 | 0 | 155 mm | Perfect | Portsmouth in September |
| October | 22° / 15° | 3 | 28 | 0 | 93 mm | Good | Portsmouth in October |
| November | 15° / 9° | 5 | 25 | 0 | 70 mm | Good | Portsmouth in November |
| December | 11° / 5° | 6 | 23 | 1 | 80 mm | Ok | Portsmouth in December |