15-Day Weather Forecast - Helsinki

15-day weather forecast for Helsinki: temperatures from 7°C (45°F) to 17°C (63°F). Average daily high 15°C (59°F) over the next 15 days.

Hourly Forecast by Day

Today·11 Sep
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Temperature · peaks at +17°C

15-Day Temperature Trend

17°10°TodaySep16°10°Tmrw16°14°Sun16°11°Mon16°8°Tue15°14°Wed14°12°Thu16°13°Fri15°13°Sat14°13°Sun13°10°Mon15°10°Tue14°10°Wed14°10°Thu12°7°Fri
Colour scale for daily high temperature bars

15-Day Weather Forecast

Updated just now
  • Date
    High / Low
  • Fri, Sep 11Today
    +17°/+10°
    feels +14°0.6 mm · 94%25 km/hUV 4 · Mod
    06:3819:54
  • Sat, Sep 12Tomorrow
    +16°/+10°
    feels +15°0 mm · 67%15 km/hUV 2 · Low
    06:4019:51
  • Sun, Sep 13Sun
    +16°/+14°
    feels +15°6.2 mm · 63%19 km/hUV 2 · Low
    06:4219:47
  • Mon, Sep 14Mon
    +16°/+11°
    feels +16°0 mm · 4%9 km/hUV 3 · Mod
    06:4519:44
  • Tue, Sep 15Tue
    +16°/+8°
    feels +15°0.4 mm · 21%16 km/hUV 3 · Low
    06:4719:41
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  • Wed, Sep 16Wed
    +15°/+14°
    feels +13°19.6 mm · 67%25 km/hUV 1 · Low
    06:5019:38
  • Thu, Sep 17Thu
    +14°/+12°
    feels +14°20.5 mm · 53%21 km/hUV 2 · Low
    06:5219:35
  • Fri, Sep 18Fri
    +16°/+13°
    feels +13°11.4 mm · 82%23 km/hUV 3 · Low
    06:5419:32
  • Sat, Sep 19Sat
    +15°/+13°
    feels +12°19.8 mm · 63%27 km/hUV 3 · Low
    06:5719:29
  • Sun, Sep 20Sun
    +14°/+13°
    feels +12°20.6 mm · 50%23 km/hUV 2 · Low
    06:5919:26
  • Mon, Sep 21Mon
    +13°/+10°
    feels +12°9.4 mm · 47%14 km/hUV 2 · Low
    07:0119:23
  • Tue, Sep 22Tue
    +15°/+10°
    feels +11°2.2 mm · 45%24 km/hUV 3 · Low
    07:0419:20
  • Wed, Sep 23Wed
    +14°/+10°
    feels +11°23.8 mm · 53%28 km/hUV 3 · Low
    07:0619:17
  • Thu, Sep 24Thu
    +14°/+10°
    feels +10°3.4 mm · 36%22 km/hUV 2 · Low
    07:0819:14
  • Fri, Sep 25Fri
    +12°/+7°
    feels +10°0 mm · 34%14 km/hUV 1 · Low
    07:1119:11

Weather Insight

Helsinki's 15-day outlook ranges from a low of 7°C to a high of 17°C, with an average daytime high near 15°C. Air quality is currently good (AQI 24), with no notable outdoor health concerns.

Today vs Normal

17°C+2° above normal

The long-term average high for today is 15°C.

10 of the last 19 days with published data ran above normal.

It continues that pattern - today's forecast is also running above normal.

2026-08-19: 18°C18°2026-08-20: 16°C16°2026-08-21: 18°C18°2026-08-22: 16°C16°2026-08-23: 17°C17°2026-08-24: 17°C17°2026-08-25: 18°C18°2026-08-26: 20°C20°2026-08-27: 19°C19°2026-08-28: 19°C19°2026-08-29: 19°C19°2026-08-30: 19°C19°

Red = above normal, blue = at or below · last 12 days

Air Quality

Air Quality
Good

Air quality is considered satisfactory, and air pollution poses little or no risk. It’s a good day to be active outside.

Extended Outlook for Helsinki

Over the next 15 days, Helsinki is forecast to see temperatures ranging from 6°C to 18°C, averaging a daily high of 15°C. The extended outlook indicates significant rainfall totalling 137.9 mm spread across 12 days. Conditions are suitable for most outdoor activities; carry an umbrella on days with showers.