5-day weather forecast Helsinki 21-04-2026

Weather forecast Helsinki Tuesday, April 21 21.04.2026: sunny, temperature from 3 °C to 11 °C.

No precipitation expected. Wind up to 3.11 m/s (gusts 6.5 m/s). Air humidity 42–63%, atmospheric pressure 763–767 mm Hg, UV index up to 3.

Sunrise 05:46
Sunset 20:54

Waxing Crescent17% illuminated
Moonrise 06:14 · Moonset 03:06

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Table

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Tue, Apr 21, 2026

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Forecast from 3 °C to 11 °C and precipitation

Temperature & Precipitation
Time	00:00	01:00	02:00	03:00	04:00	05:00	06:00	07:00	08:00	09:00	10:00	11:00	12:00	13:00	14:00	15:00	16:00	17:00	18:00	19:00	20:00	21:00	22:00	23:00
Temperature (°C)	4	4	4	3	3	3	3	3	5	7	8	9	10	10	11	11	11	11	10	10	9	8	8	8
Precipitation (mm/hr)	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0

Cloud cover and precipitation probability

Cloud cover & Rain chance
Time	00:00	01:00	02:00	03:00	04:00	05:00	06:00	07:00	08:00	09:00	10:00	11:00	12:00	13:00	14:00	15:00	16:00	17:00	18:00	19:00	20:00	21:00	22:00	23:00
Cloud cover (%)	9	5	2	9	14	11	2	3	6	0	2	2	3	3	16	29	29	25	29	29	32	96	100	100
Rain chance (%)	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0

Wind speed and direction

Wind & Wind gust
Time	00:00	01:00	02:00	03:00	04:00	05:00	06:00	07:00	08:00	09:00	10:00	11:00	12:00	13:00	14:00	15:00	16:00	17:00	18:00	19:00	20:00	21:00	22:00	23:00
Wind (m/s)	1.61	1.69	2.19	2.39	2.61	2.69	2.61	2.5	2.31	2.11	2.11	1.5	0.5	0.81	1.31	1.39	1.5	1.31	1.5	1.19	1.39	2	2.81	3.11
Wind gust (m/s)	3.36	3.58	4.61	5.03	5.47	5.67	5.47	5.25	4.22	3.42	3.28	2.39	0.75	1.17	1.92	2.11	2.42	2.19	2.69	2.31	2.92	4.19	5.89	6.5
Wind direction (°)	WNW 292°	NW 317°	NNW 330°	NNW 336°	NNW 340°	NNW 344°	N 349°	N 352°	N 356°	N 359°	N 0°	N 4°	N 9°	SW 216°	W 263°	W 280°	NW 304°	NW 324°	NNW 330°	NNW 337°	N 356°	N 353°	N 351°	N 353°

Air humidity

Humidity
Time	00:00	01:00	02:00	03:00	04:00	05:00	06:00	07:00	08:00	09:00	10:00	11:00	12:00	13:00	14:00	15:00	16:00	17:00	18:00	19:00	20:00	21:00	22:00	23:00
Humidity (%)	61	61	61	61	61	62	63	62	56	51	47	45	42	43	44	45	47	47	47	49	52	54	55	57

Atmospheric pressure

Pressure
Time	00:00	01:00	02:00	03:00	04:00	05:00	06:00	07:00	08:00	09:00	10:00	11:00	12:00	13:00	14:00	15:00	16:00	17:00	18:00	19:00	20:00	21:00	22:00	23:00
Pressure (mm Hg)	767	767	767	767	767	767	766	766	766	766	766	766	765	764	764	764	764	764	763	763	763	763	763	763

Ultraviolet index

UV Index
Time	00:00	01:00	02:00	03:00	04:00	05:00	06:00	07:00	08:00	09:00	10:00	11:00	12:00	13:00	14:00	15:00	16:00	17:00	18:00	19:00	20:00	21:00	22:00	23:00
UV Index	0	0	0	0	0	0	0	0.1	0.4	0.9	1.4	2.1	2.7	3	2.9	2.5	1.6	1.2	0.6	0.3	0.1	0	0	0

← Mon, Apr 20

Tue, Apr 21, 2026

Wed, Apr 22 →

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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.

Learn more about our methodology →