Helsinki in september: average Weather, Temperature and Climate
Weather in Helsinki in september 2025
The weather in Helsinki in the month of september comes from statistical datas on the past years. You can view the weather statistics for the whole month, but also navigating through the tabs for the beginning, the middle and the end of the month.
Average weather throughout september
good weather
Weather at 6am
56°F
Partly Cloudy
31% of time
27%
23%
16%
Weather at 12pm
61°F
Clear/Sunny
30% of time
23%
23%
16%
Weather at 6pm
58°F
Clear/Sunny
33% of time
31%
18%
14%
Weather at 3am
54°F
30%
28%
20%
16%
Evolution of daily average temperature and precipitation in Helsinki in september
These charts show the evolution of average minimum/maximum temperatures as well as average daily precipitation volume in Helsinki in september.
The climate of Helsinki in september is good
the weather in Helsinki in september is wet (with 3.1in of precipitation over 5 days). The weather is better from the previous month since in august it receives an average of 4.3in of rainfall over 7 days.
The climate is relatively cold in that area september, but it is bearable when dressing warm. Temperatures are up to 61°F. On average, the recorded minimum temperature is 56°F. Thus, the mean temperature average on this month of september in Helsinki is 58°F. Note that seasonal normals are in contrast with those observed in Helsinki in the month of september with a maximum record of 72°F in 2018 and a minimum record of 38°F in 2013. You can hope to have about 7 days with temperatures up to 65°F, or 23% of time.
On this month of september, day length in Helsinki is generally 12:53. The sun rises at 05:48 and sunset is at 18:41.
With a correct weather, this month is okay (but not good) to go in that area.
Seasonal average climate and temperature of Helsinki in september
Check below seasonal norms These statistics are generated from the weather statements earlier years of the month of september.
| September | |||||
| Outside temperature | |||||
| Average temperature | 58°F | ||||
| Highest temperature | 61°F | ||||
| Lowest temperature | 56°F | ||||
| Highest record temperature | 72°F (2018) | ||||
| Lowest record temperature | 38°F (2013) | ||||
| Number of days at +65°F | 7 day(s) (23%) | ||||
| Number of days at -32°F | 0 day(s) (0%) | ||||
| Sea temperature | |||||
| Average sea temperature | 60°F | ||||
| Lowest sea temperature | 53°F | ||||
| Highest sea temperature | 67°F | ||||
| Wind | |||||
| Wind speed | 21km/h | ||||
| Wind temperature | 52°F | ||||
| Precipitation (rainfall) | |||||
| Rainfall | 3.1in | ||||
| Number of days with rainfall | 5 day(s) (18%) | ||||
| Record daily rainfall | 1.1in (2012) | ||||
| Snowfall | 0cm | ||||
| Other climate data | |||||
| Humidity | 84% | ||||
| Visibility | 9.51km | ||||
| Cloud cover | 46% | ||||
| UV index | 4 | ||||
| Daily sunshine hours | 11 | ||||
| Sunrise and sunset | |||||
| Time of sunrise | 05:48 | ||||
| Time of sunset | 18:41 | ||||
| Length of day | 12:53 | ||||
| Our opinion about the weather in september | |||||
| Our opinion at whereandwhen.net | good | ||||
How was the weather last september?
Here is the day by day recorded weather in Helsinki in september 2024:
56°F to 61°F
58°F to 65°F
59°F to 70°F
61°F to 70°F
59°F to 74°F
59°F to 68°F
58°F to 70°F
59°F to 70°F
58°F to 72°F
63°F to 68°F
59°F to 65°F
58°F to 65°F
59°F to 63°F
59°F to 68°F
54°F to 61°F
52°F to 67°F
58°F to 68°F
52°F to 65°F
52°F to 68°F
52°F to 68°F
52°F to 61°F
41°F to 52°F
49°F to 58°F
58°F to 65°F
59°F to 63°F
56°F to 59°F
58°F to 59°F
50°F to 56°F
41°F to 52°F
41°F to 54°F
Map: other cities in Finland in september
Cities near Helsinki:
| Vantaa in september | good weather |
| Kirkkonummi in september | good weather |
| Porvoo in september | good weather |
| Lohja in september | good weather |
| Ingå in september | good weather |
| Mäntsälä in september | good weather |
| Riihimäki in september | good weather |
| Ekenäs in september | good weather |
| Hämeenlinna in september | tolerable weather |
| Lahti in september | tolerable weather |
| Forssa in september | good weather |
| Salo in september | good weather |
Click over cities on the map for information about the weather in september.
Helsinki
perfect weather
good
tolerable
bad
very bad
Weather data for Helsinki in september:
Weather data for Helsinki for september are derived from an average of the weather forecast since 2009 in Helsinki. There is a margin of error and these forecasts are to be considered as general information only. The weather in Helsinki can vary slightly from year to year, but this data should limit surprises. So you can pack your bags or check for the best time in year to go to Helsinki.