Weather outlook for September 2025

Portsmouth weather in September 2025

The temperatures in Portsmouth in September are usually low and can range between 13°C and 18°C.

You can expect about 3 to 8 days of rain in Portsmouth during the month of September. 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 September 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
Temperatures
18° / 13°
Rainy Days
Rainy Days
5
Snowy Days
Snowy Days
0
Dry Days
Dry Days
25
Rainfall
Rainfall
68
mm
9.7
Sun Hours
9.7
Hrs

Portsmouth annual weather

Month Temperatures Rainy Days Dry Days Snowy Days Rainfall Weather More details
January 8° / 4° 9 19 2 108 mm
Awful
February 8° / 5° 8 18 2 88 mm
Awful
March 10° / 5° 6 25 1 69 mm
Ok
April 12° / 7° 5 25 0 57 mm
Ok
May 15° / 9° 5 26 0 69 mm
Good
June 17° / 12° 5 25 0 89 mm
Good
July 20° / 14° 5 26 0 79 mm
Good
August 20° / 15° 5 26 0 82 mm
Good
September 18° / 13° 5 25 0 68 mm
Good
October 15° / 11° 8 23 0 126 mm
Ok
November 11° / 8° 8 21 0 127 mm
Bad
December 9° / 6° 9 21 1 122 mm
Bad
Temperatures in Portsmouth in September
Rain in Portsmouth in September

Recommended Hotels in Portsmouth

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That’s why we run our special tools and found the best hotels in Portsmouth. Click on hotel for more details.

Weather in Portsmouth in September - FAQ

What is the average temperature in Portsmouth in September?
The average temperature in Portsmouth in September is 13/18° C.
What is the chance of rain in Portsmouth in September?
On average, there are 5 rainy days in Portsmouth during September.
Weather wise, is September a good time to visit Portsmouth?
The weather in Portsmouth in September is good.
Can it snow in Portsmouth in September?
On average, there are 0 snowy days in Portsmouth in September.
More about the weather in Portsmouth