5-day weather forecast Helsinki 18-04-2026

Weather forecast Helsinki tomorrow 18.04.2026: partly cloudy, temperature from 4 °C to 8 °C.

No precipitation expected. Wind up to 3.11 m/s (gusts 5.78 m/s). Air humidity 52–76%, atmospheric pressure 767–769 mm Hg, UV index up to 3.1.

Sunrise 05:55
Sunset 20:46

Waxing Crescent1% illuminated
Moonrise 05:31 · Moonset 23:21

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Table

← Fri, Apr 17

Sat, Apr 18, 2026

Sun, Apr 19 →

Forecast from 4 °C to 8 °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)	5	5	6	5	4	4	4	4	5	6	6	6	8	8	8	8	8	7	6	6	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 (%)	9	32	53	73	46	52	29	18	8	4	48	23	13	30	31	32	30	46	54	52	62	46	37	64
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)	1.19	1.31	2.11	2.31	2.31	2.61	2.89	2.81	3.11	3.11	2.39	2.5	2	1.81	2.19	2.5	2.5	2.69	2.31	1.89	2	1.61	1.81	2.39
Wind gust (m/s)	2.53	2.72	4.42	4.83	4.83	5.47	5.78	5.25	4.97	4.67	3.67	3.67	2.81	2.53	3.14	3.61	3.64	4	3.56	3	3.33	3.08	3.53	4.53
Wind direction (°)	NE 48°	NE 37°	ENE 63°	NE 48°	NE 37°	ENE 58°	NE 54°	NE 56°	ENE 62°	ENE 69°	ESE 112°	ESE 123°	E 95°	ESE 109°	ESE 123°	SE 144°	SSE 161°	SSE 162°	SSE 166°	SE 143°	ESE 113°	E 100°	E 100°	E 100°

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 (%)	68	69	66	68	72	74	75	76	70	64	68	66	56	53	52	54	55	59	61	61	64	69	70	74

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	768	768	768	768	768	768	769	769	768	768	768	768	768	768	768	768	768	769	769	769

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	0.3	0.7	1.5	2.2	2.8	3.1	3	2.6	1.9	1.2	0.6	0.3	0	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)	6.1	5.9	5.9	5.7	5.3	5	4.7	4.7	4.7	4.8	4.6	4.6	4.5	4.4	4.2	4.1	4	3.9	4	4.1	4.3	4.3	4.5	4.9
PM10 (µg/m³)	9.4	8.9	8.3	7.2	7.4	7.9	8.3	7.2	5.6	5.3	5.6	5.7	5.5	5.2	5.8	5.8	5.2	5.7	5.6	5.5	5.9	6.5	7.1	8.5
Ozone (O₃) (µg/m³)	71	69	66	63	59	55	51	48	48	43	40	42	47	58	68	69	70	74	73	73	70	68	64	55
NO₂ (µg/m³)	15	14.4	15.5	13.5	11.7	10.9	10.7	11.2	10.2	10.6	10.5	10.6	9.9	8	6.1	4.8	4.8	5.7	6.8	8.7	10.1	12.2	14.6	19
SO₂ (µg/m³)	2.3	2.6	2.8	2.4	1.9	1.8	1.8	1.7	1.7	2	2.4	2.6	3	3.4	3.2	2.2	1.6	1.5	1.6	1.6	1.8	2	2	2.2
CO (µg/m³)	194.9	194.9	197.9	193.9	193.9	185.9	184.9	183.9	177.9	174.9	183.9	202.9	208.9	184.9	179.9	175.9	172.9	174.9	173.9	176.9	187.9	191.9	196.9	189.9

← Fri, Apr 17

Sat, Apr 18, 2026

Sun, Apr 19 →

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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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