Uusimaa (Helsinki)
September
Weather in Uusimaa for September 2026
Your guide to Uusimaa weather in September - trends and predictions
Wind warning for sea areas - See hour by hour.
Until now, September 2026 in Uusimaa is slightly cooler than the historical average by 0.5 °C.
The forecast for the next days in Uusimaa predicts temperatures to be around 14 °C, close to the historical average.
In general, the average temperature in Uusimaa at the beginning of September is 17.3 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 13.6 °C by the end of September.
Uusimaa experiences moderate rainfall in September, with an average of 9 rainy days and a total precipitation of 62.1 mm.
Official Weather Alert ⚠️
Temperatures
Rain 🌧️
21
Dry days
9
Rainy days
0
Snow days
15°/10°
Temperatures
18 km/h
Avg max wind
78 %
Avg humidity
Uusimaa Weather September
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What’s the Weather Like in Uusimaa This September?
Discover the average temperatures and weather trends across Uusimaa’s cities this September.
Temperatures trend during September in Uusimaa
See the weather trend as well as the moving average line
September weather in Uusimaa day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. |  Patchy rain possible | 17° /11° | 1.5 mm | 3 | |
| 2 Sept. | Patchy rain possible | 16° /9° | 2.7 mm | 3 | |
| 3 Sept. | Patchy rain possible | 17° /10° | 0.7 mm | 4 | |
| 4 Sept. |  Partly cloudy | 17° /10° | 0.1 mm | 4 | |
| 5 Sept. |  Overcast | 18° /10° | 0.1 mm | 4 | |
| 6 Sept. |  Sunny | 18° /10° | 0.3 mm | 4 | |
| 7 Sept. | Overcast | 18° /9° | 0.1 mm | 4 | |
| 8 Sept. |  Cloudy | 18° /12° | 0.2 mm | 4 | |
| 9 Sept. | Sunny | 19° /12° | 1.7 mm | 4 | |
| 10 Sept. | Partly cloudy | 18° /11° | 1 mm | 4 | |
| 11 Sept. | Overcast | 18° /11° | 1.9 mm | 4 | |
| 12 Sept. |  Moderate rain at times | 17° /11° | 1.3 mm | 4 | |
| 13 Sept. | Moderate rain at times | 16° /11° | 7.6 mm | 3 | |
| 14 Sept. | Partly cloudy | 16° /10° | 6.2 mm | 4 | |
| 15 Sept. | Overcast | 15° /8° | 3.3 mm | 3 | |
| 16 Sept. | Overcast | 15° /10° | 2.9 mm | 3 | |
| 17 Sept. | Light rain shower | 15° /9° | 3.1 mm | 4 | |
| 18 Sept. | Overcast | 15° /8° | 1.7 mm | 3 | |
| 19 Sept. | Patchy rain possible | 16° /9° | 2.9 mm | 3 | |
| 20 Sept. | Overcast | 15° /9° | 1.7 mm | 3 | |
| 21 Sept. | Patchy rain possible | 15° /9° | 1.1 mm | 3 | |
| 22 Sept. | Cloudy | 14° /7° | 0 mm | 3 | |
| 23 Sept. | Overcast | 13° /7° | 2.9 mm | 3 | |
| 24 Sept. | Partly cloudy | 13° /8° | 2.1 mm | 4 | |
| 25 Sept. | Light rain shower | 12° /11° | 7.4 mm | 0.8 | |
| 26 Sept. | Light rain shower | 13° /11° | 7.1 mm | 1.5 | |
| 27 Sept. |  Mist | 13° /11° | 1.8 mm | 1.4 | |
| 28 Sept. | Mist | 14° /8° | 0 mm | 4 | |
| 29 Sept. | Sunny | 15° /12° | 0 mm | 4 | |
| 30 Sept. | Partly cloudy | 15° /11° | 0 mm | 5 | |
| Next | |||||
Important Notice
Our weather forecast for Uusimaa in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Uusimaa forecast closer to your planned date for the most up-to-date weather information.
Change Month
Uusimaa in September - FAQ
What are the expected maximum and minimum temperatures in Uusimaa during September?
During September, expect a variety of temperatures with highs around 15° and lows near 10°, suitable for diverse activities and preferences.
How much rainfall should be expected in Uusimaa during September?
Moderate rainfall is anticipated in Uusimaa during September, with a total of 62.1 mm spread over approximately 9 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in Uusimaa during September?
The average wind speed in Uusimaa during September is 18 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Uusimaa
Explore the daily rainfall trends and prepare for Uusimaas September weather 💧
Typically, Uusimaa has 9 rainy days in September with a total of 62.1 mm of rainfall.
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