5-day weather forecast Helsinki Sep 12, 2026

16°8° · Overcast

Weather forecast Helsinki Saturday Sep 12, 2026: overcast, temperature from 8 °C to 16 °C.

Precipitation probability 31%. Wind up to 3 m/s (gusts 8 m/s). Air humidity 63–94%, atmospheric pressure 759–761 mm Hg, UV index up to 2.3.

Weather Alerts

ModerateSep 10, 03:00 PM — Sep 10, 11:00 PMTranslate with Google

Yellow heavy rain warning: Locally in the southern part of the country, Thu 15.00 - 23.00

Heavy rain warning

Heavy rain warning: From the afternoon on heavy rain of more than 20 mm per hour can be expected.

ModerateSep 10, 03:00 PM — Sep 10, 11:00 PMTranslate with Google

Yellow heavy rain warning: Locally in the southern part of the country, Thu 15.00 - 23.00

Heavy rain warning

Heavy rain warning: From the afternoon on heavy rain of more than 20 mm per hour can be expected.

5 days at a glance — tap a day to open it

Sunrise 06:41
Sunset 19:51

New Moon3% illuminated
Moonrise 08:23 · Moonset 19:33

Chart

Table

← Fri, Sep 11

Sat, Sep 12, 2026

Sun, Sep 13 →

Forecast from 8 °C to 16 °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)	9	9	9	9	9	9	8	8	10	11	13	14	14	15	16	16	16	15	15	14	13	13	13	13
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 (%)	40	96	73	92	70	71	31	15	33	73	94	100	89	100	100	98	70	81	82	88	99	100	100	50
Rain chance (%)	19	31	25	30	24	24	16	14	13	14	15	16	14	15	15	15	10	14	17	22	26	27	28	18

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)	3	2.69	2.31	2.11	1.61	1.31	1.31	1.11	1.19	1.31	1	0.69	0.69	0.69	1.11	1.61	2	2.31	1.89	1.61	1.69	1.69	1.89	1.89
Wind gust (m/s)	8	7.11	5.11	3.03	1.69	1.39	1.33	1.14	1.22	1.53	1	1	1	1.11	1.42	1.61	2.03	2.42	2.81	2.92	2.33	2.44	3.83	3.94
Wind direction (°)	W 275°	WNW 284°	WNW 289°	WNW 300°	NW 310°	NNW 329°	N 350°	N 5°	NE 34°	NE 53°	ENE 72°	SE 127°	SSE 156°	S 177°	S 174°	SSE 167°	S 177°	S 178°	S 171°	S 179°	SSW 192°	SSW 204°	SW 222°	SSW 207°

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 (%)	93	94	92	92	92	91	90	88	81	72	65	64	64	63	63	63	63	67	74	81	85	86	87	87

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)	761	761	761	761	761	761	761	761	761	761	761	761	761	761	761	760	760	760	759	759	760	759	759	759

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	0.2	0.4	0.8	1.4	2	2.3	2.1	1.5	0.7	0.3	0.1	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)	2.2	2.2	2.2	2.2	2.1	2.1	2.2	2.5	2.5	2.8	2.9	2.2	2.3	2.8	3	2.9	2.6	2.7	3.2	3.8	4.5	4.5	4.9	5.2
PM10 (µg/m³)	3.1	3.3	3.4	3.5	3.6	3.7	3.6	4.3	4.6	4.3	4.4	3.7	4	4.7	5.2	5	5.3	6.4	6.3	6.3	7.5	8.1	8.2	8.2
Ozone (O₃) (µg/m³)	56	54	52	49	47	46	46	46	50	53	57	61	66	71	75	79	77	78	79	80	81	80	80	79
NO₂ (µg/m³)	4.1	4.3	4.7	5.4	5.3	5.5	6.8	7.5	7.8	6.4	5.2	4	3.2	2.6	2.2	2.1	2.4	2.4	2.5	3	3.5	3.7	3.9	3.9
SO₂ (µg/m³)	0.4	0.3	0.3	0.3	0.4	0.4	0.5	0.6	0.7	0.7	0.4	0.4	0.3	0.3	0.2	0.3	0.2	0.2	0.3	0.3	0.4	0.4	0.3	0.3
CO (µg/m³)	157	160	160	160	160	160	161	164	176	177	171	168	167	161	159	158	155	155	156	165	171	174	172	169

← Fri, Sep 11

Sat, Sep 12, 2026

Sun, Sep 13 →

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 →