Portsmouth weather live forecast

Today's maximum temperature in Portsmouth is expected to be 17°C. Select a day from the live weather forecast for Portsmouth, England, UK for more weather parameters.

Saturday
13th Sep
17

13

6

4
Sunday
14th Sep
18

12

0

2
Monday
15th Sep
18

12

6

4
Tuesday
16th Sep
18

11

6

3
Wednesday
17th Sep
18

13

2

3

5-day weather forecast updated at 04:02 on Saturday 13th September 2025 GMT

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The 5-day weather forecast for England (Portsmouth) is provided by the Swiss meteorological agency, meteoblue. Find out more about our data sources.

Portsmouth weather forecast by day

Below are the detailed weather forecasts for Portsmouth for the next 5 days.

Portsmouth weather for Saturday 13th September 2025

Expect isolated thunderstorms in Portsmouth, England with a maximum temperature of 17°C, maximum UV of 4 (Moderate) and 6 hours of bright sunshine. There are 10-20 mm of rainfall expected with 65% chance of some rain and a fresh breeze of 30 kph from the south-west.

17
°C maximum temperature
13
°C minimum temperature
isolated thunderstorms
6
hours of sunshine
4
UV index (Moderate)
65
% chance of some rain
<20
mm of rainfall expected
17
°C wind chill
30
kph wind from SW

Portsmouth weather for Sunday 14th September 2025

Expect mostly cloudy with light rain in Portsmouth, England with a maximum temperature of 18°C, maximum UV of 2 (Low) and no hours of bright sunshine. There are 2-5 mm of rainfall expected with 89% chance of some rain and a strong breeze of 41 kph from the south-west.

18
°C maximum temperature
12
°C minimum temperature
mostly cloudy with light rain
0
hours of sunshine
2
UV index (Low)
89
% chance of some rain
<5
mm of rainfall expected
18
°C wind chill
41
kph wind from SW

Portsmouth weather for Monday 15th September 2025

Expect sunshine and showers in Portsmouth, England with a maximum temperature of 18°C, maximum UV of 4 (Moderate) and 6 hours of bright sunshine. There are 0-2 mm of rainfall expected with 46% chance of some rain and a strong breeze of 43 kph from the west.

18
°C maximum temperature
12
°C minimum temperature
sunshine and showers
6
hours of sunshine
4
UV index (Moderate)
46
% chance of some rain
<2
mm of rainfall expected
0
no heat & humidity
43
kph wind from W

Portsmouth weather for Tuesday 16th September 2025

Expect sunshine and showers in Portsmouth, England with a maximum temperature of 18°C, maximum UV of 3 (Moderate) and 6 hours of bright sunshine. There are 2-5 mm of rainfall expected with 57% chance of some rain and a moderate breeze of 28 kph from the west.

18
°C maximum temperature
11
°C minimum temperature
sunshine and showers
6
hours of sunshine
3
UV index (Moderate)
57
% chance of some rain
<5
mm of rainfall expected
18
°C wind chill
28
kph wind from W

Portsmouth weather for Wednesday 17th September 2025

Expect mostly cloudy with rain in Portsmouth, England with a maximum temperature of 18°C, maximum UV of 3 (Moderate) and 2 hours of bright sunshine. There are 10-20 mm of rainfall expected with 71% chance of some rain and a strong breeze of 39 kph from the south-west.