5-day weather forecast Helsinki Sep 30, 2026

14°9° · Mist

Weather forecast Helsinki Wednesday Sep 30, 2026: mist, temperature from 9 °C to 14 °C.

Precipitation probability 42%. Wind up to 2.81 m/s (gusts 6.33 m/s). Air humidity 88–97%, atmospheric pressure 774–777 mm Hg, UV index up to 0.3.

Sunrise 07:23
Sunset 18:56
Waning Gibbous75% illuminated
Moonrise 18:45 · Moonset 13:10
Chart
Table

Forecast from 9 °C to 14 °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)131312111010999101414141414131313131313131213
Precipitation (mm/hr)0.050.040.04000000000000.020.01000.020.010000

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 (%)94797915571001001255100100100100100100100100100100100100100100
Rain chance (%)353130212839382015133029292831323131334042423939

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)2.392.812.692.612.52.52.52.52.612.111.611.892.392.612.612.312.111.811.391.391.611.51.691.69
Wind gust (m/s)5.396.336.315.895.6155.035.035.834.612.53.113.723.894.194.224.223.923.112.222.832.4233.31
Wind direction (°)N 357°N 3°N 10°N 9°NNE 12°NNE 12°NNE 15°NNE 18°NNE 19°NNE 27°ESE 107°ESE 115°ESE 123°ESE 122°SE 132°SE 127°SE 127°SSE 147°S 181°SSW 203°SSW 205°SSW 198°SSW 196°S 180°

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 (%)939493969696959494889089888889929291929697979796

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)774774775775776776776776777777776776776776776776776776776776776776777777

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 Index0000000000.10.20.30.30.30.30.20.10.1000000

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)8.16.45.554.64.54.64.54.6554.43.93.73.42.83.13.64.14.34.65.15.55.9
PM10 (µg/m³)8.56.95.85.35.15.25.55.566.97.26.86.36.15.25.35.46.37.27.67.688.48.6
Ozone (O₃) (µg/m³)404341383837353229293031364250495146433633323228
NO₂ (µg/m³)11.9108.787.38.19.210.91418.415.212.39.58.58.38.59.611.917.123.129.330.828.924.7
SO₂ (µg/m³)0.70.50.50.50.50.60.60.91.51.71.81.92.12.32.32.32.42.32.32.42.32.42.52.8
CO (µg/m³)204199193192191194193197218232223208204204204204205219222232221221227239

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.