September could be a good time to visit Helsinki, as the weather is generally fine. The average high temperature is around +57°F, and there are typically 6 sunny days in September. However, expect about 8 rainy days, and total monthly rainfall of approximately 77 mm. The weather is changeable so pack for every eventuality. Search flightsin one click on Avionero.
Average weather
☀️
+57°F
Avg. max. temperature
+32°F
Min.
+72°F
Max.
77 mm
Total precipitation
80%
Avg. humidity
3 m/s
Avg. wind
6 ☀️
Sunny Days
16 ⛅️
Cloudy
8 🌦
Rainy
Our opinion: Helsinki has OK weather in September.
Average temperature in Helsinki in September
Here are the expected maximum, average and minimum temperatures in Helsinki for September based on the historical data.
Last Year
Historical Data
The expected average maximum temperature in September is +55°F with a maximum of +63°F and a minimum of +37°F.
The average maximum temperature goes down 21% by the end of the month, compared with the beginning of the month, from +57°F to +52°F.
Is Helsinki warm or cold in September?
Helsinki is typically mild in September.
Maximum temperatures go down compared to the previous month from +66°F to +57°F. The minimum temperature also goes down from +55°F to +48°F.
Pack a light jacket as it will be warm in the day and cool in the evenings.
Take a look at how September is compared to other months in Helsinki:
Climate in Helsinki in September
Helsinki weather looks like this, on average, in September and the surrounding months.
August
September
October
Avg. temperature
+66°F
+57°F
+48°F
Min. temperature
+37°F
+32°F
+18°F
Max. temperature
+84°F
+72°F
+64°F
Rainfall
79 mm
77 mm
80 mm
Wind
3 m/s
3 m/s
4 m/s
Humidity
76%
80%
83%
Air pressure
1010 HPa
1011 HPa
1011 HPa
Sunny days
10
6
5
Cloudy days
13
16
17
Rainy days
8
8
9
Snowy days
0
0
0
September weather is still as ok as in August.It’s getting colder in September. From +66°F in the day, the average maximum temperature lowers to +57°F.As September arrives, the amount of rainfall goes down. On average, the rainfall volume decreases from 79 mm to 77 mm.Humidity rises from 76% to 80%.The average wind speed doesn’t change much during September, staying around 3 m/s.The days becoming less sunny, going from 10 sunny days in August to 6 in September.
October brings much the same weather, it remains ok.
Wind speed in Helsinki in September based on historical data.
Last Year
Historical Data
The average wind speed is 3 m/s getting up to 7 m/s which is a medium breeze. You can feel it, especially getting out of the water.
The average wind speed in Helsinki is gradually decreasing during September, going from 5 m/s to 1 m/s over the course of the month.
Rain
Amount of rainfall in mm during September in Helsinki based on historical data.
Last Year
Historical Data
Typically, there is a 47% chance of rain on an average day in September, with total rainfall of approximately 131 mm. The maximum amount of rainfall per day is around 34 mm, which is moderate rain.September is a pretty wet month with over 14 rainy days, so don’t forget to pack an umbrella, raincoat, and a pair of wellies.
September is one of the rainiest months in Helsinki, here is a comparison with other months, total mm:
Helsinki wettest month is October, where a typical day has a 29% chance of precipitation and 80 mm of rainfall per day. March, on the other hand, is the driest month with a mere 3% chance of precipitation and 9 mm of rainfall per day.
How was the weather last September in Helsinki?
This is the weather in Helsinki in September 2023:
1 September
☀️
+58°F
2 September
☀️
+57°F
3 September
☀️
+55°F
4 September
☀️
+55°F
5 September
☁️
+53°F
6 September
☀️
+62°F
7 September
☀️
+56°F
8 September
☀️
+57°F
9 September
☀️
+58°F
10 September
☀️
+61°F
11 September
☀️
+62°F
12 September
☀️
+61°F
13 September
☁️
+56°F
14 September
🌧️
+55°F
15 September
🌧️
+58°F
16 September
🌧️
+56°F
17 September
☀️
+56°F
18 September
☁️
+58°F
19 September
🌧️
+57°F
20 September
☁️
+54°F
21 September
☁️
+55°F
22 September
☁️
+54°F
23 September
☀️
+56°F
24 September
☀️
+55°F
25 September
☀️
+55°F
26 September
☁️
+54°F
27 September
☀️
+56°F
28 September
🌧️
+53°F
29 September
🌧️
+46°F
30 September
🌧️
+52°F
In September 2023 Helsinki had 16 sunny days, 7 cloudy days, and 7 rainy days. The average maximum temperature was +55°F, with an absolute maximum of +63°F and a minimum of +46°F. The average humidity was 79%, with a maximum of 94% and a minimum of 46%. The average wind speed was 3 m/s, with a maximum of 10 m/s and a minimum of 0 m/s.
Are you planning a trip in September?
Climate Change Over the Years
This is how Helsinki climate has changed over the last 43 years.
The climate in Helsinki in September has not changed that much over the last 43 years.
The average temperature was the lowest in 1993 (+52°F) and the highest in 2006 (+65°F). The driest year was 2002 with only 15 mm of rainfall, and the wettest year was 2012 with 180 mm.
FAQ
Frequently asked questions about the weather in Helsinki in September:
Is September a good time to visit Helsinki?
It’s always a good time to visit Helsinki, but the weather is changeable in September, so plan a mix of indoor and outdoor activities and exploring, and pack for every eventuality.
Can you sunbathe in Helsinki in September?
September has mild temperatures in Helsinki. Not ideal for sunbathing, but still good for daytime outdoor activities, but plan for cool evenings. Pack a light jacket and shorts!
Is Helsinki rainy in September?
Helsinki is often rainy in September. You may get a bit damp when outside, so pack an umbrella, and maybe even a raincoat.
Is it sunny in Helsinki in September?
Usually, it’s not very sunny in Helsinki in September, often it’s pretty cloudy. Pack for any eventuality; layering can help reduce the number of bulky items needed.
Other cities in Finland
Check out the weather for other cities in Finland.
For this page, we’ve looked at the typical weather in Helsinki, based on historical hourly weather data from January 1, 1979, to December 31, 2022.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.