Helsinki Weather in September

What's the weather like in Helsinki (Province of Western Finland) in September 2023?

The climate in Helsinki during September can be summarized as mild and reasonably dry.

September is in the fall / autumn in Helsinki and is typically the 4th warmest month of the year. Daytime maximum temperatures average around a cool 14°C (57°F), whilst at night 8°C (47°F) is normal.

Helsinki weather averages (imperial / metric)
Daytime temperature 13.8°C 56.8°F
Nightly temperature 8.2°C 46.8°F
Average temperature 11°C 51.8°F
Daily sunshine 4.4 hrs
Avg rainfall 64 mm 2.5 ins
Rainy days 16 days
Sea temperature 13.9°C 57°F
Humidity 84%
Windspeed 18kph 11 mph

On average September is the 2nd wettest month of the year in Helsinki with around 64mm 2.5 inches of rain making it a reasonably dry time to visit. This rainfall is typically spread over 16 days, although this may vary considerably.

On the flip side this corresponds to an average of 4.4 hours of sunshine per day.

September temperatures in Helsinki

Helsinki average temperature in September

September rainfall

Helsinki average rain in September

September hourly sunshine

Helsinki average rain in September

The data used in these monthly averages covers a period of over 100 years right up until last year. As such they are a valid prediction of what to expect for the weather in Helsinki in September 2023.

Other monthly averages

Best places to visit in September

UV index Best time to go?

Helsinki weather stats

Helsinki weather statistics
Hottest month: July 19.5°C 67.1°F
Driest month: February 25mm 1ins
Sunniest month: June 10.7hrs
Coldest month: February -2.7°C 27.1°F
Wettest month: August 75mm 3ins
Map showing location of Helsinki (60.60778, 21.4381)

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