5-day weather forecast Helsinki 18-05-2026

Weather forecast Helsinki today 18.05.2026: sunny, temperature from 5 °C to 15 °C.

Precipitation probability 89%. Wind up to 4.81 m/s (gusts 8.83 m/s). Air humidity 47–90%, atmospheric pressure 764–766 mm Hg, UV index up to 3.6.

Sunrise 04:34
Sunset 22:00
Waxing Crescent2% illuminated
Moonrise 04:10 · Moonset 00:29
Chart
Table
Mon, May 18, 2026
TemperatureRain chanceCloud coverHumidityPressureWindUV Index
00:00Weather
Clear
7 °C0% 0%86%764 mm HgW 276° 2.39 (5.03) m/s0
01:00Weather
Clear
10 °C0% 0%62%764 mm HgWNW 293° 2.31 (4.83) m/s0
02:00Weather
Clear
6 °C0% 0%89%766 mm HgWNW 296° 2 (4.19) m/s0
03:00Weather
Clear
6 °C0% 0%90%766 mm HgNW 305° 1.81 (3.78) m/s0
04:00Weather
Clear
6 °C0% 4%90%766 mm HgNNW 330° 2.31 (4.83) m/s0
05:00Weather
Sunny
5 °C0% 6%90%766 mm HgNNW 342° 1.89 (4) m/s0
06:00Weather
Partly cloudy
6 °C0% 32%85%766 mm HgNNW 346° 2.31 (4.67) m/s0.1
07:00Weather
Cloudy
8 °C0% 68%77%766 mm HgN 359° 2.11 (3.67) m/s0.4
08:00Weather
Overcast
9 °C0% 100%70%766 mm HgNNE 18° 2.11 (3.33) m/s0.9
09:00Weather
Overcast
10 °C0% 100%65%766 mm HgNE 38° 2.19 (3.36) m/s1.5
10:00Weather
Sunny
11 °C0% 5%60%766 mm HgENE 64° 2.19 (3.33) m/s2.4
11:00Weather
Sunny
12 °C0% 13%56%766 mm HgENE 70° 1.89 (2.81) m/s3
12:00Weather
Partly cloudy
14 °C0% 48%52%766 mm HgENE 65° 1.69 (2.5) m/s3.3
13:00Weather
Partly cloudy
14 °C0% 50%48%765 mm HgENE 61° 1.89 (2.94) m/s3.6
14:00Weather
Partly cloudy
14 °C0% 48%48%765 mm HgESE 106° 2.31 (3.83) m/s3.4
15:00Weather
Partly cloudy
15 °C0% 50%47%765 mm HgE 82° 2.31 (3.83) m/s2.6
16:00Weather
Partly cloudy
13 °C0% 52%53%764 mm HgESE 111° 2.5 (4.72) m/s1.3
17:00Weather
Cloudy
13 °C0% 66%55%764 mm HgE 98° 2.11 (4.08) m/s0.4
18:00Weather
Partly cloudy
13 °C0% 57%55%764 mm HgENE 74° 2 (3.89) m/s0.3
19:00Weather
Patchy rain possible
13 °C89% (0.03 mm/hr)59%59%764 mm HgENE 59° 1.39 (2.94) m/s0.3
20:00Weather
Light drizzle
12 °C100% (0.31 mm/hr)88%64%764 mm HgE 88° 2.11 (4.36) m/s0.1
21:00Weather
Light rain
11 °C100% (0.8 mm/hr)100%77%764 mm HgNE 47° 2 (3.94) m/s0
22:00Weather
Light drizzle
10 °C100% (0.46 mm/hr)85%85%764 mm HgN 7° 3.31 (6.36) m/s0
23:00Weather
Patchy rain possible
11 °C63% (0.02 mm/hr)87%82%764 mm HgNNE 16° 4.81 (8.83) m/s0
Mon, May 18, 2026

Frequently asked questions about the weather in Helsinki

Today in Helsinki the temperature ranges from 5 °C to 15 °C, wind up to 4.81 m/s. Check the detailed hourly forecast above for more information.

The precipitation probability in Helsinki today is 89%. View the full multi-day forecast above to see the rain chances for each upcoming day.

The wind speed in Helsinki today reaches up to 4.81 m/s with gusts up to 8.83 m/s. Check the detailed wind chart above for hourly wind data.

The air humidity in Helsinki today ranges from 47% to 90%. View the humidity chart above for hourly details.

The UV index in Helsinki today reaches up to 3.6. Check the UV index chart above for hourly values throughout the day.

The atmospheric pressure in Helsinki today ranges from 764 to 766 mm Hg. View the pressure chart above for hourly readings.

Cloud cover in Helsinki today reaches up to 100%. Check the cloud cover chart above for hourly details throughout the day.

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.