5-day weather forecast Helsinki Sep 12, 2026
15°Weather forecast Helsinki Saturday Sep 12, 2026: light rain shower, temperature from 8 °C to 15 °C.
Precipitation probability 67%. Wind up to 2.81 m/s (gusts 7.42 m/s). Air humidity 68–98%, atmospheric pressure 758–761 mm Hg, UV index up to 2.3.
Weather Alerts
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
Sunset 19:51
New Moon3% illuminated
Moonrise 08:23 · Moonset 19:33
Moonrise 08:23 · Moonset 19:33
Chart
Table
| Time | Weather | Temperature | Rain chance | Cloud cover | Humidity | Pressure | Wind | UV Index |
|---|---|---|---|---|---|---|---|---|
| 00:00 |  Clear | 10 °C | 15% | 10% | 92% | 761 mm Hg | WNW 285° 2.69 (7.42) m/s | 0 |
| 01:00 | Clear | 9 °C | 15% | 6% | 93% | 761 mm Hg | WNW 283° 2.81 (6.69) m/s | 0 |
| 02:00 |  Mist | 9 °C | 29% | 64% | 94% | 761 mm Hg | WNW 285° 2.61 (6.44) m/s | 0 |
| 03:00 | Clear | 9 °C | 16% | 16% | 94% | 761 mm Hg | WNW 284° 2.31 (4.53) m/s | 0 |
| 04:00 | Clear | 9 °C | 16% | 11% | 93% | 761 mm Hg | WNW 291° 2.11 (3) m/s | 0 |
| 05:00 | Clear | 8 °C | 15% | 5% | 93% | 761 mm Hg | NW 314° 1.61 (1.69) m/s | 0 |
| 06:00 |  Partly cloudy | 8 °C | 21% | 53% | 92% | 761 mm Hg | NNW 348° 1.19 (1.31) m/s | 0 |
| 07:00 |  Overcast | 8 °C | 30% | 100% | 91% | 761 mm Hg | NNE 16° 1.11 (1.11) m/s | 0 |
| 08:00 | Overcast | 10 °C | 25% | 100% | 83% | 761 mm Hg | NE 37° 0.81 (0.81) m/s | 0.2 |
| 09:00 | Overcast | 11 °C | 21% | 100% | 76% | 761 mm Hg | NNW 344° 0.39 (0.53) m/s | 0.4 |
| 10:00 | Overcast | 12 °C | 19% | 97% | 72% | 761 mm Hg | NW 319° 0.61 (0.81) m/s | 0.8 |
| 11:00 |  Patchy rain possible | 13 °C | 12% (0.01 mm/hr) | 61% | 70% | 761 mm Hg | WSW 241° 0.81 (1.39) m/s | 1.4 |
| 12:00 |  Cloudy | 15 °C | 13% | 72% | 68% | 761 mm Hg | SW 226° 1.5 (2.5) m/s | 2 |
| 13:00 | Overcast | 15 °C | 19% | 100% | 72% | 761 mm Hg | SW 230° 2.19 (3.22) m/s | 2.3 |
| 14:00 | Patchy rain possible | 14 °C | 34% (0.11 mm/hr) | 100% | 81% | 761 mm Hg | SW 222° 2.5 (3.61) m/s | 2.1 |
| 15:00 | Patchy rain possible | 13 °C | 40% (0.11 mm/hr) | 100% | 89% | 761 mm Hg | SW 223° 2.19 (4.11) m/s | 1.5 |
| 16:00 | Light rain shower | 12 °C | 67% (0.6 mm/hr) | 100% | 95% | 760 mm Hg | SSW 210° 2.11 (4) m/s | 0.7 |
| 17:00 |  Mist | 12 °C | 45% (0.05 mm/hr) | 100% | 97% | 760 mm Hg | SSW 202° 1.81 (3.61) m/s | 0.3 |
| 18:00 | Mist | 12 °C | 40% (0.02 mm/hr) | 100% | 96% | 760 mm Hg | S 184° 1.19 (2.03) m/s | 0.1 |
| 19:00 | Light rain shower | 12 °C | 50% (0.21 mm/hr) | 100% | 97% | 759 mm Hg | SSE 163° 1.39 (2.22) m/s | 0 |
| 20:00 |  Light rain shower | 12 °C | 52% (0.23 mm/hr) | 100% | 98% | 759 mm Hg | SSE 151° 1.19 (1.5) m/s | 0 |
| 21:00 | Light rain shower | 12 °C | 41% (0.21 mm/hr) | 63% | 98% | 759 mm Hg | SE 143° 1.31 (1.61) m/s | 0 |
| 22:00 |  Fog | 12 °C | 53% (0.1 mm/hr) | 100% | 98% | 758 mm Hg | SSE 150° 1 (1.11) m/s | 0 |
| 23:00 | Light rain shower | 12 °C | 53% (0.25 mm/hr) | 100% | 98% | 758 mm Hg | SSE 150° 1 (1) m/s | 0 |
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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.