worldweather17°Cnear normal
usually 14°C–18°C
night: cooler than usual
rain: typical rainfall
wind: exceptionally light
Weather in Helsinki - 14-day forecast
Detailed weather forecast for Helsinki, Finland: daytime and night temperature, rain, sunrise and sunset - today and for the next two weeks.
Forecast for the next days in Helsinki
today☁️
17°💧 1 mm
Sun🌤️
15°💧 1.7 mm
Mon☀️
15°💧 4.4 mm
Tue🌧️
16°💧 0.7 mm
Wed🌧️
17°💧 4.2 mm
Thu🌧️
14°💧 6.3 mm
Fri🌧️
16°💧 3.7 mm
Sat🌧️
15°💧 3 mm
Forecast vs 1991-2020 climate normal
NASA POWERHow does the current forecast compare with normal?
We compare the coming days with weather usually observed at this time of year.
Sunday 6 Sept in Helsinki, the forecast high is 15°C. Typical daytime temperatures at this time of year range from 14°C to 18°C, so it will be cooler than usual. It is cooler than 77% of similar days.
15°Ccooler than usual
usually 14°C–18°C
cooler than 77% of similar days
night: cooler than usual
rain: typical rainfall
wind: stronger than usual
15°Ccooler than usual
usually 14°C–18°C
cooler than 75% of similar days
night: near normal
rain: more rain than usual
wind: typical
16°Cnear normal
usually 14°C–18°C
night: exceptionally warm
rain: typical rainfall
wind: typical
17°Cwarmer than usual
usually 14°C–18°C
warmer than 75% of similar days
night: warmer than usual
rain: more rain than usual
wind: typical
14°Ccooler than usual
usually 14°C–17°C
cooler than 75% of similar days
night: near normal
rain: more rain than usual
wind: typical
16°Cnear normal
usually 14°C–17°C
night: near normal
rain: more rain than usual
wind: typical
How warm was this week in previous years?
Each bar shows the average daily high during the same 7-day period in each year.
cooler yearstypical rangewarmer years2026 forecastcurrent forecast
From 1981 to 2025, the 5-11 Sept period averaged 16°C by day. The coolest year was 1993 (12°C) and the warmest was 2024 (21°C). The current forecast averages 16°C - close to the historical median.
Historical reference: NASA POWER daily gridded data (MERRA-2), the 1991-2020 normal and a +/- 7-day calendar window. The typical range is the 20th-80th percentile. This is not a city weather-station reading and does not change the current forecast. NASA POWER Daily API.
Weather warnings - Helsinki
No active weather warnings for Helsinki (region: Western Gulf of Finland). The national weather service is not forecasting dangerous conditions.
14-day forecast - Helsinki
Helsinki 30 & 45-day weather - long-range outlook
Next 16 days · forecast
15°
around 13° at night · days with rain: 12
Weeks 3-4 · avg for September
16°
around 7° at night · rain chance 39%
Weeks 5-7 · avg for October
9°
around 2° at night · rain chance 39%
The 30 & 45-day outlook for Helsinki: the next 16 days are a numerical forecast updated daily - on average 15° by day and 13° at night. Further out we rely on multi-year climate averages: around 16° in September, and about 9° in October. Forecasts beyond two weeks are indicative only.
Day-by-day forecast for Helsinki
Saturday5 September 2026
☁️17°overcast clouds
Sunday6 September 2026
🌤️15°scattered clouds
Monday7 September 2026
☀️15°clear sky
Tuesday8 September 2026
🌧️16°light rain
Wednesday9 September 2026
🌧️17°light rain
Thursday10 September 2026
🌧️14°light rain
Friday11 September 2026
🌧️16°moderate rain
Saturday12 September 2026
🌧️15°light rain
Sunday13 September 2026
🌧️13°light rain
Monday14 September 2026
🌤️12°a few clouds
Tuesday15 September 2026
☁️13°overcast clouds
Wednesday16 September 2026
🌧️16°light rain
Thursday17 September 2026
🌧️16°light rain
Friday18 September 2026
🌧️15°light rain
Saturday19 September 2026
☀️17°clear sky
Sunday20 September 2026
☁️17°broken clouds
UV index in Helsinki - is it safe to sunbathe?
Today the UV index in Helsinki is 4 (moderate) - unprotected fair skin can burn in about 55 minutes. Seek shade around midday. SPF 30+, sunglasses and a hat for longer stays.
Pollen in Helsinki - info for allergy sufferers
Today ragweed pollen is highest in Helsinki - about 33 grains/m³, high level. Allergy sufferers should limit time outdoors on dry, windy days and take medication as advised. Pollen levels are a CAMS model forecast and are indicative.
Sea temperature - Helsinki
Water today
18°C
Week avg
17°C
Waves today
0 m
How's the water?
cold
16-day sea temperature forecast:
Average sea temperature through the year:
Sea-surface temperature from marine models, updated daily. See also: where the sea is warmest right now.
Air quality and smog in Helsinki
Air quality in Helsinki is currently very good. Fine particulate PM2.5: 3 µg/m³, PM10: 4.5 µg/m³.
| City | PM2.5 (µg/m³) | PM10 (µg/m³) | Air quality |
|---|---|---|---|
| Helsinki | 3 | 4.5 | very good |
Based on PM2.5 thresholds. Station readings, updated daily (last reading: 2026-09-05, 04:00).
Helsinki weather through the year
Warmest, driest months on average: May, June, July, August.
Upcoming public holidays in Finland: All Saints' Day — 31 October · Independence Day — 6 December · Christmas Eve — 24 December.
Nearby and related places
FAQ - Helsinki weather
What is the weather like in Helsinki today?
Today it is about 17° during the day and 11° at night, overcast clouds.
How far ahead can I check the forecast for Helsinki?
This page shows a detailed 14-day forecast plus the long-term monthly climate, so you can plan both a short trip and a holiday months ahead.