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When to go · Helsinki

Helsinki in September

Good month. Cool, clear, quieter; autumn colours.

Key facts

Verdict
Good
Temperature
15°C (59°F) / 9°C (48°F)
average high / low
Rain days
13
Crowds
Medium
Finland overall
Prices
Medium
Finland overall

Verdict

GoodVoykit month rating for Helsinki

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

Long-term averages
  • HelsinkiHighs around 15 °C (59 °F), lows around 9 °C (48 °F), 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.

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)

    May: 14 °C (57 °F)

  • Night low

    Sep: 9 °C (48 °F)

    May: 6 °C (43 °F)

  • 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

Build the full packing list for your trip →

Across Finland in September →