Helsinki weather in September (Southern Finland, Finland)

Will it be warm or cold in Helsinki this September? Find all the essential weather information for this month in our guide.

Temperatures

The month of September in Helsinki typically brings moderate temperatures and moderate rainfall. As the day progresses, temperatures can peak at 16°C. Luckily at nightfall, they typically drop to 8°C.

Precipitation

Helsinki in September usually receives moderate rainfall, averaging around 64 mm for the month. Historically, approximately 17 days this month are expected to have rain.

Average sunshine

Expect a moderate amount of sunlight, with approximately 151 hours. This means a pleasant mix of sun and clouds.

If you prefer dry days with pleasant temperatures, June, July and August typically offer the best circumstances. While January, February, March, April, October, November and December tend to showcase less optimal conditions.

For an in-depth look at the yearly conditions, visit our specialized Helsinki climate page with graphs.

 

Helsinki, monthly averages in September

Min Temperature 8°C  

Max Temperature 16°C  

Water Temperature 13°C  

Chance of Rain 57%  

Precipitation 64 mm  

Rainy days 17 days  

Humidity 84%  

Windspeed 11 km/h  

Sunshine 151 hours  

Percentage Sunshine  

Where to go in Finland in September

Find out more about the weather in Finland and which places have the best travel conditions in this month.

Weather conditions Weather

Temperatures

Precipitation

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Legend perfect weather pleasant tolerable unpleasant poor

Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C and 29°C and not too much precipitation (less than 90 mm a month).

So, what should you wear in this month?

For visitors traveling to Helsinki, we recommend wearing layers. So maybe a skirt, t-shirt, shorts for during the day and jeans and a warm jacket for some days and evenings. Bring a rain jacket in case it rains during your stay. Plan on layering your clothes. With a water temperature of around 13°C there is no need to bring your swimwear.

What To Do

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Swimming

5/10

Cycling

6/10

Walking

6/10

Barbeque

6/10

Camping

4/10

Outdoor sports

10/10

Interested in more climate information?

This site provides you with all the information you need about the climate in Helsinki.

Our site offers climate and forecast data for every country in the world. Are you going to Finland? On this website you can find historical weather averages for many cities in Finland. Not sure yet where to go? We now have a tool which recommends destinations that suit your ideal travel conditions. Find out where to go with our weather planner.