5-day weather forecast Helsinki 18-05-2026

Weather forecast Helsinki today 18.05.2026: sunny, temperature from 5 °C to 17 °C.

Precipitation probability 61%. Wind up to 2.69 m/s (gusts 5.25 m/s). Air humidity 39–90%, 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%765 mm HgW 266° 2.31 (4.83) m/s0
01:00Weather
Clear
6 °C0% 0%88%765 mm HgW 280° 2 (4.19) m/s0
02:00Weather
Clear
6 °C0% 1%89%765 mm HgWNW 302° 2.19 (4.61) m/s0
03:00Weather
Clear
6 °C0% 2%90%765 mm HgNW 317° 2.19 (4.61) m/s0
04:00Weather
Clear
5 °C0% 3%90%766 mm HgNNW 327° 2.11 (4.42) m/s0
05:00Weather
Sunny
5 °C0% 4%90%766 mm HgN 349° 1.89 (4) m/s0
06:00Weather
Sunny
6 °C0% 5%84%766 mm HgN 1° 1.89 (3.83) m/s0.1
07:00Weather
Sunny
8 °C0% 6%76%766 mm HgN 5° 2.19 (3.78) m/s0.4
08:00Weather
Sunny
9 °C0% 2%68%766 mm HgNNE 20° 2.11 (3.25) m/s0.9
09:00Weather
Sunny
11 °C0% 16%61%766 mm HgNE 40° 1.89 (2.83) m/s1.5
10:00Weather
Overcast
12 °C0% 100%55%766 mm HgNE 55° 2 (2.92) m/s2.4
11:00Weather
Overcast
13 °C0% 100%51%766 mm HgENE 78° 1.89 (2.78) m/s3
12:00Weather
Sunny
14 °C0% 13%48%766 mm HgE 98° 1.61 (2.31) m/s3.3
13:00Weather
Sunny
15 °C0% 14%46%766 mm HgESE 109° 1.5 (2.28) m/s3.6
14:00Weather
Sunny
15 °C0% 14%44%765 mm HgESE 110° 1.19 (1.81) m/s3.4
15:00Weather
Sunny
16 °C0% 17%42%765 mm HgESE 114° 2.19 (3.44) m/s2.6
16:00Weather
Partly cloudy
15 °C0% 26%45%765 mm HgSE 125° 1.89 (3.28) m/s1.3
17:00Weather
Partly cloudy
15 °C0% 48%47%764 mm HgSE 131° 2.39 (4.47) m/s0.4
18:00Weather
Cloudy
13 °C0% 70%55%764 mm HgSSE 156° 2.69 (5.25) m/s0.3
19:00Weather
Partly cloudy
12 °C0% 53%58%764 mm HgSSE 167° 0.61 (1.25) m/s0.3
20:00Weather
Cloudy
12 °C0% 82%58%764 mm HgN 10° 0.5 (1.06) m/s0.1
21:00Weather
Patchy rain possible
12 °C61% (0.01 mm/hr)100%57%764 mm HgNNE 13° 1.81 (3.78) m/s0
22:00Weather
Light drizzle
17 °C100% (0.27 mm/hr)0%39%764 mm HgENE 62° 2 (4.14) m/s0
23:00Weather
Light drizzle
10 °C100% (0.58 mm/hr)100%75%764 mm HgNNE 33° 1.61 (3.22) m/s0
Mon, May 18, 2026

Frequently asked questions about the weather in Helsinki

Today in Helsinki the temperature ranges from 5 °C to 17 °C, wind up to 2.69 m/s. Check the detailed hourly forecast above for more information.

The precipitation probability in Helsinki today is 61%. 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 2.69 m/s with gusts up to 5.25 m/s. Check the detailed wind chart above for hourly wind data.

The air humidity in Helsinki today ranges from 39% 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.