The temperatures in Portsmouth in May are quite cold with temperatures between 9°C and 15°C, warm clothes are a must.
You can expect about 3 to 8 days of rain in Portsmouth during the month of May. It’s a good idea to bring along your umbrella so that you don’t get caught in poor weather.
Our weather forecast can give you a great sense of what weather to expect in Portsmouth in May 2025.
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.
Temperatures
15° / 9°
Rainy Days
5
Snowy Days
0
Dry Days
26
Rainfall
69
mm
Sun Hours
9.4
Hrs
