5-day weather forecast Helsinki 17-08-2026

Weather forecast Helsinki tomorrow 17.08.2026: patchy rain possible, temperature from 14 °C to 20 °C.

Precipitation probability 45%. Wind up to 5.11 m/s (gusts 7.22 m/s). Air humidity 63–95%, atmospheric pressure 749–752 mm Hg, UV index up to 3.6.

Sunrise 05:39
Sunset 21:09
Waxing Crescent27% illuminated
Moonrise 12:43 · Moonset 21:21
Chart
Table

Forecast from 14 °C to 20 °C and precipitation

Temperature & Precipitation
Time00:0001:0002:0003:0004:0005:0006:0007:0008:0009:0010:0011:0012:0013:0014:0015:0016:0017:0018:0019:0020:0021:0022:0023:00
Temperature (°C)151514141415161616171718192020202020201918171615
Precipitation (mm/hr)0.010000.110.170.160.060.020.160.230.220.410.530.410.220.830.010.020.020.020.0100

Cloud cover and precipitation probability

Cloud cover & Rain chance
Time00:0001:0002:0003:0004:0005:0006:0007:0008:0009:0010:0011:0012:0013:0014:0015:0016:0017:0018:0019:0020:0021:0022:0023:00
Cloud cover (%)10044247581777110074505774848578797569928876552035
Rain chance (%)28191726444036362326303238423625451115171714913

Wind speed and direction

Wind & Wind gust
Time00:0001:0002:0003:0004:0005:0006:0007:0008:0009:0010:0011:0012:0013:0014:0015:0016:0017:0018:0019:0020:0021:0022:0023:00
Wind (m/s)3.893.53.193.113.313.312.812.612.1122.392.52.893.894.694.54.814.815.114.53.894.314.193.69
Wind gust (m/s)6.255.895.565.475.895.974.814.393.443.173.673.533.865.226.675.866.536.837.2276.176.786.696.56
Wind direction (°)WSW 238°WSW 241°WSW 239°SW 227°SSW 213°SSW 208°SSW 212°SSW 211°SW 222°W 264°W 272°WNW 283°WNW 298°NW 306°NW 313°NW 315°WNW 302°WNW 296°WNW 299°WNW 297°WNW 302°WNW 299°WNW 292°WNW 286°

Air humidity

Humidity
Time00:0001:0002:0003:0004:0005:0006:0007:0008:0009:0010:0011:0012:0013:0014:0015:0016:0017:0018:0019:0020:0021:0022:0023:00
Humidity (%)869193949594928987838176696669656465636974767681

Atmospheric pressure

Pressure
Time00:0001:0002:0003:0004:0005:0006:0007:0008:0009:0010:0011:0012:0013:0014:0015:0016:0017:0018:0019:0020:0021:0022:0023:00
Pressure (mm Hg)750750750749749749749749749749749749749750750750751751751752752752752752

Ultraviolet index

UV Index
Time00:0001:0002:0003:0004:0005:0006:0007:0008:0009:0010:0011:0012:0013:0014:0015:0016:0017:0018:0019:0020:0021:0022:0023:00
UV Index00000000.20.50.91.42.63.23.63.62.92.11.40.70.20.1000

Air quality & pollen

Air quality
Time00:0001:0002:0003:0004:0005:0006:0007:0008:0009:0010:0011:0012:0013:0014:0015:0016:0017:0018:0019:0020:0021:0022:0023:00
PM2.5 (µg/m³)3.63.12.62.71.91.81.41.41.71.61.51.31.31.31.41.51.81.92221.91.81.7
PM10 (µg/m³)4.54.23.83.12.72.32.12.32.42.52.3222.12.22.32.82.933.12.82.72.82.8
Ozone (O₃) (µg/m³)727366575348494441414346485050505051525249494744
NO₂ (µg/m³)2.82.932.72.42.32.32.73.43.12.11.81.71.61.61.722.22.22.933.73.94.7
SO₂ (µg/m³)0.20.20.20.20.20.20.20.30.30.30.30.30.30.30.20.20.30.30.30.30.30.30.30.3
CO (µg/m³)132129131131129125123125132125122123123122122121123125123127124123126127

Helsinki on the map

Data Sources & Methodology

Our weather forecasts are powered by a professional weather data provider that aggregates data from national weather services, satellite observations, radar networks, and over 80,000 weather stations worldwide. Forecast data is updated multiple times daily. We convert raw data into clear summaries — wind speed in m/s, pressure in mmHg — so you can plan your day with confidence.