5-day weather forecast Helsinki 18-06-2026

Weather forecast Helsinki tomorrow 18.06.2026: sunny, temperature from 12 °C to 19 °C.

Precipitation probability 14%. Wind up to 7.31 m/s (gusts 12.42 m/s). Air humidity 50–87%, atmospheric pressure 753–757 mm Hg, UV index up to 5.2.

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ModerateJun 17, 12:00 PM — Jun 17, 09:00 PMTranslate with Google

Yellow wave height warning: Western Gulf of Finland, Wed 15.00 - Thu 0.00

Wave height warning

Wave height warning: Rough waves occur from the afternoon on. Significant wave height exceeds 2.5 meters.

ModerateJun 17, 12:00 PM — Jun 17, 09:00 PMTranslate with Google

Yellow wave height warning: Western Gulf of Finland, Wed 15.00 - Thu 0.00

Wave height warning

Wave height warning: Rough waves occur from the afternoon on. Significant wave height exceeds 2.5 meters.

Sunrise 03:53
Sunset 22:49

Waxing Crescent19% illuminated
Moonrise 07:26 · Moonset 00:55

Chart

Table

← Wed, Jun 17

Thu, Jun 18, 2026

Fri, Jun 19 →

Forecast from 12 °C to 19 °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)	13	13	12	12	12	12	12	13	14	16	17	18	19	19	19	19	19	19	19	19	17	16	15	14
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 (%)	21	12	8	8	8	15	17	16	13	12	12	9	16	17	13	12	30	46	18	21	20	23	44	54
Rain chance (%)	14	11	10	10	9	9	9	8	6	4	3	3	3	3	3	3	4	5	3	4	6	7	11	14

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)	7.31	7.31	7.19	6.61	5.81	5.61	5.39	5.31	4.89	4.5	4.11	4.11	4.89	5.19	5.19	5.5	5.61	5.39	5.31	5.61	6.61	5.61	4.61	4.19
Wind gust (m/s)	12.17	12.19	12.42	11.39	10.11	9.67	8.89	8.03	7.11	6.47	6.03	6.19	7.33	7.83	7.78	8.11	8.11	8.06	8.22	9.44	12.11	10	8.17	7.39
Wind direction (°)	NW 313°	NW 310°	NW 310°	NW 306°	WNW 302°	WNW 297°	WNW 295°	WNW 294°	WNW 301°	WNW 299°	WNW 294°	W 278°	W 267°	W 266°	W 263°	W 260°	WSW 256°	WSW 255°	WSW 252°	WSW 253°	W 260°	W 269°	W 268°	W 271°

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 (%)	87	83	81	79	78	77	76	73	66	60	55	53	53	51	50	51	52	53	54	59	65	70	75	79

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)	753	754	754	755	755	755	755	755	755	755	755	755	755	755	755	755	755	755	755	755	755	756	756	757

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	0.3	0.6	1.2	2	3	4	4.2	4.8	5.2	4.3	3.3	1.1	0.3	0.1	0.1	0.1	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)	2.3	2.2	2.1	2.1	2.2	2.3	2.4	2.7	2.9	3.1	2.9	2.8	2.7	2.7	2.7	2.7	3.5	3.9	4	3.6	3.3	3.4	3.5	3.6
PM10 (µg/m³)	3	2.7	2.7	2.6	2.7	2.8	3.2	3.7	3.8	4	3.9	4.1	4.3	4.6	4.1	4.3	5	6.4	6	5.5	5.9	5.9	6.1	6.1
Ozone (O₃) (µg/m³)	63	61	59	56	54	52	51	51	50	52	55	59	63	65	70	73	74	73	73	71	69	68	63	60
NO₂ (µg/m³)	2.9	2.5	2.3	2.4	2.5	2.6	2.7	3	4.2	4.4	4	4	3.4	3.3	3.1	3.1	3.3	4.6	5.1	5.4	5	5.3	5.8	5.6
SO₂ (µg/m³)	0.3	0.2	0.2	0.2	0.2	0.3	0.4	0.5	0.6	0.6	0.6	0.5	0.5	0.4	0.4	0.3	0.3	0.3	0.3	0.3	0.4	0.4	0.4	0.4
CO (µg/m³)	110	109	106	106	107	107	107	107	120	122	122	122	120	121	120	121	123	125	126	122	115	115	115	116

← Wed, Jun 17

Thu, Jun 18, 2026

Fri, Jun 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.

Learn more about our methodology →