When to go · Helsinki
Helsinki in September
Good month. Cool, clear, quieter; autumn colours.
Key facts
- Verdict
- Good
- Temperature
- 15°C (59°F)59°F (15°C) / 9°C (48°F)48°F (9°C)
- average high / low
- Rain days
- 13
- Crowds
- Medium
- Finland overall
- Prices
- Medium
- Finland overall
Verdict
Cool, clear, quieter; autumn colours.
All twelve months in one grid — weather, crowds and prices, with gaps left as unknown.
Is another month better than September?
September is rated good. These months rate higher:
Weather in September
- HelsinkiHighs around 15 °C (59 °F), lows around 9 °C (48 °F), rain on about 13 daysHighs around 59 °F (15 °C), lows around 48 °F (9 °C), rain on about 13 days
- South coast, Finland · Helsinki, Turku, Porvoo, Ålandfine
Around −5 °C (23 °F) in January, 20–23 °C (68–73 °F) in July; 19 h of daylight at midsummer, 6 h in late December. The sea often freezes near shore in cold winters.Around 23 °F (−5 °C) in January, 68–73 °F (20–23 °C) in July; 19 h of daylight at midsummer, 6 h in late December. The sea often freezes near shore in cold winters.
Autumn season
Colours in September; Baltic Herring Fair in October
Watch: Dark and wet from late October.
Festivals and holidays
Dates as our data lists them. Moving holidays (lunar and Islamic calendars, Easter) shift every year: check the date for your year before you build a trip on it.
Helsinki Design Week check
September · Design District and across the city
Pop-ups, shows and crowded design streets
Crowds and prices
- Crowds · Finland overall
- Medium
- Prices · Finland overall
- Medium
Finland overall: Ruska autumn colours in Lapland and the first auroras over lakes that are not yet frozen.
Compare two months
Weather, crowds and prices for any two months in Helsinki, side by side.
Verdict
Sep: Good
May: Great (better)
Daytime high
Sep: 15 °C (59 °F)59 °F (15 °C)
May: 14 °C (57 °F)57 °F (14 °C)
Night low
Sep: 9 °C (48 °F)48 °F (9 °C)
May: 6 °C (43 °F)43 °F (6 °C)
Rain days
Sep: 13
May: 9 (better)
Crowds
Sep: Medium
May: Low
Prices
Sep: Medium
May: Medium
Festivals listed
Sep: 1
May: 1
September: Cool, clear, quieter; autumn colours.
May: Bright and fresh; ferries and terraces start.
Helsinki: figures are long-term averages from this guide, not a forecast.
What to pack
- A warm layer for the evenings
- A rain jacket or umbrella and shoes that dry fast