5-day weather forecast Helsinki 20-04-2026

Weather forecast Helsinki Monday, April 20 20.04.2026: sunny, temperature from 1 °C to 9 °C.

No precipitation expected. Wind up to 4.11 m/s (gusts 7.56 m/s). Air humidity 42–61%, atmospheric pressure 767–771 mm Hg, UV index up to 2.8.

Sunrise 05:49
Sunset 20:51

Waxing Crescent9% illuminated
Moonrise 05:44 · Moonset 01:20

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Table

← Sun, Apr 19

Mon, Apr 20, 2026

Tue, Apr 21 →

Forecast from 1 °C to 9 °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)	3	2	2	2	2	1	1	2	3	5	6	7	7	8	8	8	9	8	8	8	6	5	4	4
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 (%)	8	7	10	12	14	16	20	19	17	16	13	23	45	57	45	41	27	18	13	10	6	5	6	8
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)	2.69	2.89	3.11	3.19	3.39	3.61	3.69	3.81	3.89	4.11	4	3.61	2.89	2.39	1.89	1.61	1.19	0.81	1	1.19	1.5	2	2.19	1.89
Wind gust (m/s)	5.67	6.08	6.5	6.72	7.14	7.53	7.56	7.03	6.08	5.83	5.53	4.94	4.03	3.36	2.61	2.22	1.72	1.17	1.53	1.97	2.89	4.19	4.61	4
Wind direction (°)	N 356°	N 4°	N 7°	N 5°	N 7°	N 10°	NNE 15°	NNE 18°	NNE 25°	NNE 32°	NE 40°	NE 47°	ENE 60°	ENE 78°	E 96°	ESE 107°	ESE 114°	S 174°	SW 234°	WSW 250°	SW 234°	WSW 238°	WSW 252°	W 266°

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 (%)	55	55	55	57	58	59	59	58	54	49	45	43	42	43	43	43	43	43	44	47	52	57	60	61

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)	771	771	771	771	771	770	770	770	770	770	770	770	770	770	770	769	769	768	768	768	768	768	767	767

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	0.8	1.4	2.1	2.6	2.8	2.8	2.4	1.8	1.2	0.6	0.3	0.1	0	0	0

Air quality & pollen

Air quality
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
PM2.5 (µg/m³)	3.2	3.5	3.9	4.7	8	9.6	10.6	11	9.7	8.3	7.1	6.4	5.8	4.6	4	4.2	5.2	7.2	9.1	9.4	8.6	7.2	6.1	6
PM10 (µg/m³)	5.3	6.4	7.3	7.9	10.1	11.3	11.4	11.4	10	8.7	7.4	6.6	6.1	4.9	4.5	4.8	5.9	7.8	9.6	9.9	9	7.6	6.5	6.3
Ozone (O₃) (µg/m³)	78	65	55	66	54.2	54.5	54.8	55	56	58	60	62	65	71	77	83	86	88	90	93	96	96	92	86
NO₂ (µg/m³)	10.3	13	14.6	18.3	19.3	15.1	14.1	14.2	13.6	12.8	11.8	10.5	9.3	8	6.8	6	6	6.5	6.9	6.8	6.6	6.7	7.3	8.2
SO₂ (µg/m³)	1.8	2.4	2.8	2.9	5.1	6.8	8.3	9.7	9.2	8.7	8.5	8.4	8.2	7.6	6.9	6.2	5.7	5.2	4.9	4.6	4.5	4.5	4.8	5.2
CO (µg/m³)	178.9	187.9	204.9	204.9	257.9	245.4	216.7	202.9	204.9	209.9	213.9	218.9	218.9	204.9	184.9	172.9	174.9	184.9	192.9	194.9	194.9	203.9	230.9	266.9

← Sun, Apr 19

Mon, Apr 20, 2026

Tue, Apr 21 →

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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.

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