Uusimaa (Helsinki)
September
Weather in Uusimaa for September 2025
Your guide to Uusimaa weather in September - trends and predictions
In general, the average temperature in Uusimaa at the beginning of September is 16.4 °C. As the month progressed, temperatures tended to noticeably cool down, reaching an average of 13.4 °C by the end of September.
Uusimaa in September brings notable rainfall, with an average of 17 rainy days and a total precipitation of 64.1 mm.
Is September a good time to visit Uusimaa? check out the best time to travel to Uusimaa page.
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Temperatures
Rain 🌧️
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13
Dry days
17
Rainy days
0
Snow days
15°/9°
Temperatures
18 km/h
Avg max wind
77 %
Avg humidity
Uusimaa in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  16° | 2 15° | 3 16° | 4  16° | 5  17° | 6  18° | 7 17° |
| 8  18° | 9 19° | 10 17° | 11 18° | 12  17° | 13  16° | 14 15° |
| 15 14° | 16 15° | 17 15° | 18 14° | 19 16° | 20 14° | 21 14° |
| 22 13° | 23 14° | 24 14° | 25 14° | 26 14° | 27 14° | 28 14° |
| 29 12° | 30 12° |
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Temperatures trend during September in Uusimaa
See the weather trend as well as the moving average line
September weather day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. | Patchy rain possible | 16° /10° | 2.3 mm | 4 | |
| 2 Sept. | Patchy rain possible | 15° /9° | 4.1 mm | 4 | |
| 3 Sept. | Patchy rain possible | 16° /10° | 0.8 mm | 4 | |
| 4 Sept. | Partly cloudy | 16° /9° | 0 mm | 4 | |
| 5 Sept. | Sunny | 17° /9° | 0.2 mm | 4 | |
| 6 Sept. | Overcast | 18° /9° | 0.4 mm | 5 | |
| 7 Sept. | Overcast | 17° /9° | 0 mm | 5 | |
| 8 Sept. | Cloudy | 18° /10° | 0 mm | 5 | |
| 9 Sept. | Overcast | 19° /11° | 0.2 mm | 5 | |
| 10 Sept. | Partly cloudy | 17° /11° | 0.6 mm | 5 | |
| 11 Sept. | Patchy rain possible | 18° /11° | 2.6 mm | 5 | |
| 12 Sept. | Moderate rain at times | 17° /12° | 0.9 mm | 4 | |
| 13 Sept. | Moderate rain | 16° /11° | 9.4 mm | 4 | |
| 14 Sept. | Partly cloudy | 15° /10° | 7.6 mm | 4 | |
| 15 Sept. | Overcast | 14° /8° | 2.9 mm | 4 | |
| 16 Sept. | Overcast | 15° /9° | 1.8 mm | 3 | |
| 17 Sept. | Overcast | 15° /9° | 1.9 mm | 4 | |
| 18 Sept. | Overcast | 14° /7° | 0.1 mm | 4 | |
| 19 Sept. | Overcast | 16° /8° | 0.5 mm | 4 | |
| 20 Sept. | Overcast | 14° /9° | 0.8 mm | 4 | |
| 21 Sept. | Cloudy | 14° /8° | 0 mm | 4 | |
| 22 Sept. | Cloudy | 13° /7° | 0 mm | 4 | |
| 23 Sept. | Overcast | 14° /8° | 3.8 mm | 3 | |
| 24 Sept. | Patchy rain possible | 14° /9° | 2.7 mm | 4 | |
| 25 Sept. | Overcast | 14° /9° | 1.5 mm | 4 | |
| 26 Sept. | Patchy rain possible | 14° /9° | 5.1 mm | 4 | |
| 27 Sept. | Sunny | 14° /9° | 4.4 mm | 4 | |
| 28 Sept. | Sunny | 14° /8° | 6.2 mm | 4 | |
| 29 Sept. | Patchy rain possible | 12° /8° | 2 mm | 4 | |
| 30 Sept. | Partly cloudy | 12° /7° | 1.4 mm | 4 | |
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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.
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 9°, 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 64.1 mm spread over approximately 17 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.
What to pack to Uusimaa in September?
As you prepare for your trip to Uusimaa in September, it's important to consider the typical weather patterns for the time of year. Below is a carefully tailored packing list to ensure that your time in Uusimaa, during September, is comfortable and enjoyable, regardless of the weather conditions.
- Clothing
- Warm Clothing: Sweaters, hoodies, long pants
- Rain Gear: Lightweight, waterproof clothing
- Footwear
- Waterproof Shoes
- Accessories
- Scarves: To protect you from the cold wind
- Gloves/Mittens: Essential for cold weather
- Warm Hats: Warm hats for insulation in cold weather
- Umbrellas/Raincoats: For rainy days
September rainfall patterns in Uusimaa
Explore the daily rainfall trends and prepare for Uusimaas September weather 💧
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