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)	5.39	5.11	4.19	5	4.89	4.89	4.39	4.61	4.61	4.61	4.69	4.5	4.61	4.5	4.39	4.11	3.69	3.39	3	2.81	2.89	2.69	2.61	2.39
Wind gust (m/s)	11.69	10.83	9.83	11.64	11.39	12.42	12.53	12.69	12.11	11.92	11.81	10.31	9.11	7.89	7.14	6.92	7.03	6.89	6.81	6.69	7.92	7.72	6.69	5.39
Wind direction (°)	SSW 208°	SSW 213°	W 273°	WNW 289°	WNW 296°	WNW 295°	WNW 287°	WNW 283°	W 281°	WNW 282°	WNW 283°	WNW 284°	WNW 285°	WNW 285°	W 281°	W 277°	W 275°	W 273°	W 268°	W 262°	W 265°	W 269°	W 273°	W 277°

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 (%)	86	88	91	95	90	90	91	92	92	89	84	78	71	64	59	58	60	63	69	79	83	86	88	89

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)	759	759	760	761	761	762	763	764	764	765	766	766	767	767	767	768	768	768	769	769	770	770	770	771

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	0	0.2	0.6	1	1.4	1.7	1.6	1.3	0.9	0.5	0.2	0	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)	2.5	2.2	2	1.5	1.1	1.2	1.4	1.7	1.8	2	1.8	1.8	1.9	1.9	1.8	1.8	1.8	1.8	2	2.3	2.5	2.5	2.5	3
PM10 (µg/m³)	4.8	3.6	2.8	2.3	1.5	1.9	2.2	2.4	3.7	3.5	3.8	3.8	3.7	3.9	4	3.9	3.6	3.4	4.2	4.5	4.7	4.3	4.7	5.2
Ozone (O₃) (µg/m³)	69	60	52	50	47	48	50	49	50	57	59	59	60	64	68	70	68	67	63	59	59	59	59	60
NO₂ (µg/m³)	3	3.1	2.9	2.7	2.3	2.3	2.4	2.6	2.8	2.5	2.2	2	1.8	1.9	2	2.3	2.8	4.1	5.4	6.6	7.1	6.9	7.1	7
SO₂ (µg/m³)	0.2	0.1	0.1	0.2	0.2	0.2	0.2	0.2	0.3	0.3	0.3	0.4	0.3	0.3	0.3	0.4	0.4	0.4	0.4	0.5	0.5	0.5	0.5	0.5
CO (µg/m³)	167	169	170	172	166	168	166	170	178	181	183	183	181	180	179	180	180	185	190	195	188	189	187	188

← Sat, Sep 26

Sun, Sep 27, 2026

Mon, Sep 28 →

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.

Learn more about our methodology →

5-day weather forecast Helsinki Sep 27, 2026

Weather Alerts

Forecast from 9 °C to 15 °C and precipitation

Cloud cover and precipitation probability

Wind speed and direction