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Climate · Helsinki

Helsinki in September

Mild and damp, as the days shorten.

Typical weather, averaged over 30 years

September in Helsinki is mild: highs near 63°F, lows near 51°F. Rain falls on about three days a week, less often as the month goes on, and the days shorten by 1 hour 58 minutes from the first week to the last.September in Helsinki is mild: highs near 17°C, lows near 11°C. Rain falls on about three days a week, less often as the month goes on, and the days shorten by 1 hour 58 minutes from the first week to the last.

High
63°F17°Caverage
Low
51°F11°Caverage
Wet days
3a week · 37% of days
Daylight
12h 42mon average

Is September a good time to visit Helsinki?

September sits outside Helsinki's best months, which run from July to August. Expect mild days and rain on about three days a week.

How we judge it: every month is scored on how close its typical high comes to the range from 70°F to 80°F, how mild its nights are, and how rarely it rains. The best months are the run of months that scores best.How we judge it: every month is scored on how close its typical high comes to the range from 21°C to 27°C, how mild its nights are, and how rarely it rains. The best months are the run of months that scores best.

How September sits in the year

week by week

Temperature

Highs near 63°F in September, against 30°F to 73°F through the year.Highs near 17°C in September, against -1°C to 23°C through the year.

Chance of a wet day

37% of days in September, against 30% to 48% through the year.

Cloud cover

57% cover in September, against 49% to 77% through the year.

Daylight

12h 42m in September, against 5h 57m to 18h 46m through the year.

Week by week, lightly smoothed, with September shaded. The olive line marks the best months. Hover or tap a week for its figures.

Either side

  1. August72°22°low 58°low 14°3 wet days a weekRain on about three days a week.
  2. September63°17°low 51°low 11°3 wet days a weekRain on about three days a week.
  3. October52°11°low 42°low 6°3 wet days a weekRain on about three days a week.

Where Helsinki sits, in September

Europe/Helsinki
this place
typical high in September 40°F4°C95°F35°C
Sunrise, mid-September
6:45 AMsets 7:46 PM
Above the sea
0 mlow-lying
Latitude
60.2°Nnorthern hemisphere
Nearest of ours
Rovaniemi706 km north

The land around Helsinki, shaded by its typical high in September, the planning map's own layer. Hover the map for the figure at that spot; tap it on a phone. Clock times are local, for the 15th.

Elsewhere in Finland in September

high · low · wet days
See September on the planning mapThe whole year in Helsinki

Typical weather, averaged over 30 years (1995–2024), from the 11 km grid square nearest Helsinki. Temperatures are adjusted against 66 weather stations: daytime highs read about 3.1°F cold in the source data and are raised to match.Temperatures are adjusted against 66 weather stations: daytime highs read about 1.7°C cold in the source data and are raised to match. Daylight is calculated from latitude. Charts are lightly smoothed week to week; the figures in the table are not. Source: Copernicus ERA5-Land reanalysis; cloud cover from NASA's MERRA-2 reanalysis, on a coarser grid of about 50 km. Contains modified Copernicus Climate Change Service information 2026; neither the European Commission nor ECMWF is responsible for any use of it. These are averages, not a forecast.

Daylight is calculated from latitude. Charts are lightly smoothed week to week; the figures in the table are not.

Source: Copernicus ERA5-Land reanalysis; cloud cover from NASA's MERRA-2 reanalysis, on a coarser grid of about 50 km. Contains modified Copernicus Climate Change Service information 2026; neither the European Commission nor ECMWF is responsible for any use of it. These are averages, not a forecast.