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 18.7 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 15.4 °C by the end of September.
The climate of Uusimaa in September is notably wet, with an average of 13 rainy days.
Is September a good time to visit Uusimaa? check out the best time to travel to Uusimaa page.
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17
Dry days
13
Rainy days
0
Snow days
17°/12°
Temperatures
21 km/h
Avg max wind
83 %
Avg humidity
Uusimaa in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  17° | 2 17° | 3 19° | 4  20° | 5 21° | 6  18° | 7  19° |
| 8 20° | 9  20° | 10 20° | 11 19° | 12 19° | 13  18° | 14 17° |
| 15 16° | 16 18° | 17 18° | 18 15° | 19 19° | 20 18° | 21 17° |
| 22 15° | 23 15° | 24 17° | 25 16° | 26 16° | 27 16° | 28  16° |
| 29 14° | 30 13° |
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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. | Light rain shower | 17° /12° | 4.3 mm | 4 | |
| 2 Sept. | Light rain shower | 17° /12° | 7.4 mm | 4 | |
| 3 Sept. | Light rain shower | 19° /13° | 1.4 mm | 5 | |
| 4 Sept. | Cloudy | 20° /13° | 0 mm | 5 | |
| 5 Sept. | Patchy rain possible | 21° /13° | 0.3 mm | 5 | |
| 6 Sept. | Sunny | 18° /12° | 0 mm | 6 | |
| 7 Sept. | Partly cloudy | 19° /11° | 0 mm | 6 | |
| 8 Sept. | Cloudy | 20° /14° | 0 mm | 5 | |
| 9 Sept. | Overcast | 20° /14° | 0 mm | 5 | |
| 10 Sept. | Cloudy | 20° /14° | 1.2 mm | 5 | |
| 11 Sept. | Sunny | 19° /14° | 4.8 mm | 5 | |
| 12 Sept. | Sunny | 19° /14° | 0.1 mm | 5 | |
| 13 Sept. | Moderate rain | 18° /13° | 17 mm | 4 | |
| 14 Sept. | Overcast | 17° /11° | 11.1 mm | 4 | |
| 15 Sept. | Overcast | 16° /10° | 1.4 mm | 4 | |
| 16 Sept. | Overcast | 18° /11° | 0 mm | 4 | |
| 17 Sept. | Light rain shower | 18° /10° | 0.9 mm | 5 | |
| 18 Sept. | Overcast | 15° /8° | 0 mm | 4 | |
| 19 Sept. | Light rain shower | 19° /11° | 0.9 mm | 5 | |
| 20 Sept. | Light rain shower | 18° /11° | 1.6 mm | 5 | |
| 21 Sept. | Patchy rain possible | 17° /11° | 0 mm | 5 | |
| 22 Sept. | Sunny | 15° /10° | 0 mm | 5 | |
| 23 Sept. | Light rain shower | 15° /10° | 5.3 mm | 4 | |
| 24 Sept. | Patchy rain possible | 17° /12° | 0.6 mm | 5 | |
| 25 Sept. | Overcast | 16° /11° | 1.5 mm | 4 | |
| 26 Sept. | Patchy rain possible | 16° /12° | 10.1 mm | 4 | |
| 27 Sept. | Patchy rain possible | 16° /12° | 8.8 mm | 4 | |
| 28 Sept. | Mist | 16° /10° | 11.7 mm | 4 | |
| 29 Sept. | Partly cloudy | 14° /9° | 0.3 mm | 4 | |
| 30 Sept. | Light rain shower | 13° /8° | 1.7 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?
Enjoy moderate daytime temperatures of up to 17° and cooler nights around 12°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in Uusimaa during September?
Moderate rainfall is anticipated in Uusimaa during September, with a total of 75.3 mm spread over approximately 13 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 21 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 💧
UV exposure in Uusimaa during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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