5-day weather forecast Helsinki 21-08-2026
Weather forecast Helsinki tomorrow 21.08.2026: overcast, temperature from 10 °C to 19 °C.
Precipitation probability 56%. Wind up to 4.81 m/s (gusts 8.03 m/s). Air humidity 47–97%, atmospheric pressure 750–755 mm Hg, UV index up to 3.4.
5 days at a glance — tap a day to open it
Sunrise 05:48
Sunset 20:57
Sunset 20:57
First Quarter69% illuminated
Moonrise 19:09 · Moonset 22:02
Moonrise 19:09 · Moonset 22:02
Chart
Table
| Temperature | Rain chance | Cloud cover | Humidity | Pressure | Wind | UV Index | ||
|---|---|---|---|---|---|---|---|---|
| 00:00 |  Mist | 11 °C | 24% | 31% | 97% | 750 mm Hg | NW 318° 2.81 (5.89) m/s | 0 |
| 01:00 | Mist | 11 °C | 22% | 18% | 97% | 751 mm Hg | NW 318° 3 (7) m/s | 0 |
| 02:00 | Mist | 11 °C | 22% | 15% | 96% | 752 mm Hg | NW 315° 2.89 (7.22) m/s | 0 |
| 03:00 | Mist | 10 °C | 29% | 62% | 96% | 752 mm Hg | NW 310° 2.69 (6.22) m/s | 0 |
| 04:00 | Mist | 10 °C | 35% | 88% | 95% | 752 mm Hg | WNW 300° 2.61 (6.11) m/s | 0 |
| 05:00 |  Overcast | 11 °C | 30% | 91% | 93% | 752 mm Hg | NW 312° 2.5 (6.83) m/s | 0 |
| 06:00 |  Overcast | 12 °C | 30% | 100% | 90% | 753 mm Hg | NW 308° 2.61 (8.03) m/s | 0 |
| 07:00 | Overcast | 12 °C | 29% | 100% | 88% | 753 mm Hg | WNW 290° 1.89 (5.19) m/s | 0.1 |
| 08:00 |  Patchy rain possible | 13 °C | 21% (0.03 mm/hr) | 69% | 83% | 754 mm Hg | WNW 283° 2.31 (5) m/s | 0.4 |
| 09:00 | Patchy rain possible | 14 °C | 18% (0.02 mm/hr) | 77% | 74% | 754 mm Hg | W 276° 2.81 (4.83) m/s | 0.9 |
| 10:00 | Overcast | 17 °C | 14% | 98% | 58% | 755 mm Hg | W 275° 3 (4.42) m/s | 1.2 |
| 11:00 |  Cloudy | 18 °C | 7% | 63% | 52% | 755 mm Hg | WSW 253° 3 (3.92) m/s | 1.3 |
| 12:00 |  Sunny | 19 °C | 3% | 24% | 49% | 755 mm Hg | SW 232° 3.5 (4.11) m/s | 3 |
| 13:00 | Overcast | 19 °C | 11% | 96% | 49% | 755 mm Hg | SW 219° 4.81 (5) m/s | 3.4 |
| 14:00 |  Partly cloudy | 19 °C | 6% | 57% | 48% | 755 mm Hg | SW 216° 4.61 (4.92) m/s | 3.4 |
| 15:00 | Sunny | 19 °C | 2% | 19% | 47% | 755 mm Hg | SSW 212° 4.81 (5.33) m/s | 2.9 |
| 16:00 | Cloudy | 19 °C | 10% | 87% | 50% | 755 mm Hg | SSW 209° 4.69 (5.19) m/s | 2 |
| 17:00 | Overcast | 16 °C | 15% | 100% | 62% | 755 mm Hg | SSW 209° 3.11 (5.22) m/s | 1.1 |
| 18:00 | Overcast | 16 °C | 17% | 100% | 66% | 755 mm Hg | S 191° 1.81 (3.89) m/s | 0.5 |
| 19:00 | Patchy rain possible | 16 °C | 19% (0.01 mm/hr) | 100% | 70% | 755 mm Hg | SSE 165° 1.89 (4.39) m/s | 0.1 |
| 20:00 |  Light rain shower | 15 °C | 46% (0.35 mm/hr) | 100% | 79% | 755 mm Hg | SSE 166° 1.89 (3.33) m/s | 0 |
| 21:00 |  Light rain shower | 13 °C | 38% (0.24 mm/hr) | 61% | 91% | 755 mm Hg | S 171° 2 (2.5) m/s | 0 |
| 22:00 | Light rain shower | 14 °C | 56% (0.53 mm/hr) | 73% | 92% | 755 mm Hg | SE 141° 2 (3.33) m/s | 0 |
| 23:00 |  Partly cloudy | 14 °C | 18% | 41% | 90% | 755 mm Hg | SE 125° 2.11 (4.22) 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.