5-day weather forecast Helsinki 21-08-2026
Weather forecast Helsinki today 21.08.2026: sunny, temperature from 10 °C to 20 °C.
Precipitation probability 63%. Wind up to 5.39 m/s (gusts 7.83 m/s). Air humidity 47–96%, atmospheric pressure 751–757 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
Fri, Aug 21, 2026
| Temperature | Rain chance | Cloud cover | Humidity | Pressure | Wind | UV Index | ||
|---|---|---|---|---|---|---|---|---|
| 00:00 |  Mist | 11 °C | 20% | 7% | 96% | 751 mm Hg | NNW 335° 2.11 (2.33) m/s | 0 |
| 01:00 | Mist | 11 °C | 21% | 10% | 96% | 752 mm Hg | NNW 327° 2.31 (3) m/s | 0 |
| 02:00 | Mist | 10 °C | 21% | 11% | 96% | 752 mm Hg | NW 322° 2.31 (3.22) m/s | 0 |
| 03:00 | Mist | 10 °C | 20% | 8% | 95% | 752 mm Hg | NNW 327° 2.39 (4) m/s | 0 |
| 04:00 | Mist | 10 °C | 19% | 5% | 94% | 752 mm Hg | NW 323° 2.11 (2.5) m/s | 0 |
| 05:00 |  Clear | 10 °C | 15% | 7% | 94% | 753 mm Hg | NW 310° 1.69 (1.81) m/s | 0 |
| 06:00 |  Sunny | 10 °C | 16% | 11% | 94% | 753 mm Hg | WNW 290° 2 (2.11) m/s | 0 |
| 07:00 | Sunny | 11 °C | 14% | 12% | 90% | 754 mm Hg | WNW 298° 1.89 (3.19) m/s | 0.1 |
| 08:00 | Sunny | 13 °C | 9% | 6% | 80% | 754 mm Hg | WNW 301° 1.69 (3.19) m/s | 0.3 |
| 09:00 | Sunny | 15 °C | 6% | 8% | 70% | 754 mm Hg | W 260° 1.89 (3.42) m/s | 0.7 |
| 10:00 | Sunny | 17 °C | 4% | 5% | 63% | 755 mm Hg | WSW 240° 2.31 (3.81) m/s | 1.6 |
| 11:00 | Sunny | 18 °C | 3% | 4% | 58% | 755 mm Hg | SW 225° 2.89 (4) m/s | 2.4 |
| 12:00 | Sunny | 19 °C | 3% | 2% | 54% | 755 mm Hg | SW 217° 3.19 (4.03) m/s | 3 |
| 13:00 | Sunny | 20 °C | 2% | 7% | 50% | 755 mm Hg | SSW 208° 3.69 (4.42) m/s | 3.4 |
| 14:00 |  Partly cloudy | 20 °C | 4% | 39% | 50% | 755 mm Hg | SSW 203° 4.89 (5.42) m/s | 3.1 |
| 15:00 |  Overcast | 20 °C | 12% | 99% | 53% | 755 mm Hg | SSW 212° 5.39 (5.92) m/s | 2.6 |
| 16:00 | Overcast | 19 °C | 13% | 100% | 54% | 755 mm Hg | SW 220° 4.81 (6.53) m/s | 2.1 |
| 17:00 | Overcast | 20 °C | 11% | 100% | 47% | 755 mm Hg | SW 227° 4.61 (6.14) m/s | 1.3 |
| 18:00 | Overcast | 18 °C | 14% | 100% | 57% | 756 mm Hg | SW 222° 5.39 (7.83) m/s | 0.6 |
| 19:00 |  Patchy rain possible | 17 °C | 26% (0.12 mm/hr) | 100% | 66% | 756 mm Hg | SSW 200° 3.61 (7.11) m/s | 0.2 |
| 20:00 |  Light drizzle | 14 °C | 63% (0.55 mm/hr) | 100% | 82% | 756 mm Hg | SSW 194° 2.89 (6.03) m/s | 0 |
| 21:00 |  Patchy rain possible | 14 °C | 30% (0.01 mm/hr) | 100% | 89% | 757 mm Hg | S 169° 1.61 (2.53) m/s | 0 |
| 22:00 |  Overcast | 14 °C | 28% | 100% | 88% | 757 mm Hg | SSE 165° 2.11 (4.25) m/s | 0 |
| 23:00 | Patchy rain possible | 14 °C | 41% (0.13 mm/hr) | 100% | 89% | 757 mm Hg | SSE 154° 2.61 (5.81) m/s | 0 |
Fri, Aug 21, 2026
Frequently asked questions about the 5-day weather in Helsinki
What will the weather be like in Helsinki over the next 5 days?
Over the next 5 days in Helsinki the temperature is expected to range from about 10 to 20 °C. See the detailed hourly forecast for each of the 5 days in the charts above.
On which of the next 5 days will it rain in Helsinki?
The chance of rain in Helsinki over the next 5 days reaches 90%. Check the 5-day precipitation chart above to see exactly which days and hours bring rain.
How accurate is the 5-day weather forecast for Helsinki?
A 5-day forecast is fairly reliable: the first 2–3 days are usually very accurate, while days 4–5 may be refined. The data is updated several times a day, so check back before important plans.
Which of the next 5 days in Helsinki will be the warmest and which the coolest?
Over the next 5 days the temperature in Helsinki ranges from about 10 to 20 °C. Compare the warmest and coolest day on the temperature chart above.
Will it be windy in Helsinki over the next 5 days?
Over the next 5 days the wind in Helsinki picks up to 9 m/s. The windiest days are easy to spot on the wind chart above.
Which day of the week in Helsinki is best for a walk or a trip?
For a walk or a trip, pick the days with the lowest chance of rain (up to 90%) and light wind — easy to compare on the 5-day charts above.
How can I best use the 5-day forecast for Helsinki?
The first 2–3 days are reliable enough for firm decisions, while days 4–5 are a guide that sharpens as they approach. The forecast is updated several times a day, so check again before important plans.
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.