Weather in September 2025

Helsinki weather in September 2025

The temperatures in Helsinki in September are usually low and can range between 12°C and 15°C.

You can expect about 3 to 8 days of rain in Helsinki 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 Helsinki in September 2025.

If you’re planning to visit Helsinki in the near future, we highly recommend that you review the 14 day weather forecast for Helsinki before you arrive.

Temperatures
Temperatures
15° / 12°
Rainy Days
Rainy Days
6
Snowy Days
Snowy Days
0
Dry Days
Dry Days
24
Rainfall
Rainfall
91
mm
9.0
Sun Hours
9.0
Hrs

Helsinki annual weather

Month Temperatures Rainy Days Dry Days Snowy Days Rainfall Weather More details
January -2° / -5° 4 8 19 60 mm
Awful
February -2° / -5° 4 7 17 51 mm
Awful
March 1° / -3° 7 10 15 46 mm
Awful
April 5° / 2° 6 18 6 42 mm
Awful
May 11° / 7° 5 25 1 60 mm
Ok
June 16° / 12° 6 24 0 83 mm
Good
July 20° / 16° 6 25 0 106 mm
Good
August 19° / 15° 7 24 0 135 mm
Ok
September 15° / 12° 6 24 0 91 mm
Good
October 9° / 6° 8 20 3 90 mm
Awful
November 5° / 3° 7 18 5 76 mm
Awful
December 1° / -1° 7 11 14 72 mm
Awful
Temperatures in Helsinki in September
Rain in Helsinki in September

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Weather in Helsinki in September - FAQ

What is the average temperature in Helsinki in September?
The average temperature in Helsinki in September is 12/15° C.
What is the chance of rain in Helsinki in September?
On average, there are 6 rainy days in Helsinki during September.
Weather wise, is September a good time to visit Helsinki?
The weather in Helsinki in September is good.
Can it snow in Helsinki in September?
On average, there are 0 snowy days in Helsinki in September.
More about the weather in Helsinki