Helsinki
September
Weather in Helsinki for September 2027
Your guide to Helsinki weather in September - trends and predictions
In general, the average temperature in Helsinki at the beginning of September is 16.9 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 13 °C by the end of September.
Helsinki experiences moderate rainfall in September, with an average of 10 rainy days and a total precipitation of 69.3 mm.
Is September a good time to visit Helsinki? check out the best time to travel to Helsinki page.
Temperatures
Rain 🌧️
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20
Dry days
10
Rainy days
0
Snow days
15°/10°
Temperatures
19 km/h
Avg max wind
79 %
Avg humidity
Helsinki Weather September
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Temperatures trend during September in Helsinki
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September weather in Helsinki 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. |  Light rain | 16° /10° | 2.7 mm | 3 | |
| 3 Sept. | Patchy rain possible | 17° /11° | 0.7 mm | 3.6 | |
| 4 Sept. |  Partly cloudy | 17° /10° | 0.1 mm | 3.5 | |
| 5 Sept. |  Overcast | 18° /10° | 0.1 mm | 3.5 | |
| 6 Sept. |  Sunny | 18° /10° | 0.3 mm | 3.4 | |
| 7 Sept. | Overcast | 17° /10° | 0.1 mm | 3.3 | |
| 8 Sept. |  Cloudy | 18° /12° | 0.2 mm | 3.2 | |
| 9 Sept. | Patchy rain possible | 18° /13° | 1.7 mm | 3.1 | |
| 10 Sept. | Patchy rain possible | 17° /12° | 1 mm | 3.1 | |
| 11 Sept. | Patchy rain possible | 18° /12° | 1.9 mm | 3 | |
| 12 Sept. | Patchy rain possible | 17° /12° | 1.3 mm | 2.9 | |
| 13 Sept. |  Moderate rain at times | 16° /12° | 7.6 mm | 2.8 | |
| 14 Sept. | Light rain | 15° /10° | 6.2 mm | 2.8 | |
| 15 Sept. | Light rain | 14° /9° | 3.3 mm | 2.7 | |
| 16 Sept. | Light rain | 15° /10° | 2.9 mm | 2.6 | |
| 17 Sept. | Light rain | 15° /10° | 3.1 mm | 2.6 | |
| 18 Sept. | Patchy rain possible | 14° /8° | 1.7 mm | 2.5 | |
| 19 Sept. | Light rain | 15° /10° | 2.9 mm | 2.4 | |
| 20 Sept. | Patchy rain possible | 14° /10° | 1.7 mm | 2.3 | |
| 21 Sept. | Patchy rain possible | 15° /9° | 1.1 mm | 2.3 | |
| 22 Sept. | Cloudy | 13° /8° | 0 mm | 2.2 | |
| 23 Sept. | Light rain | 13° /8° | 2.9 mm | 2.1 | |
| 24 Sept. | Light rain | 13° /8° | 4.5 mm | 2.1 | |
| 25 Sept. | Light rain | 13° /9° | 3.7 mm | 2 | |
| 26 Sept. | Light rain | 14° /10° | 6.3 mm | 1.9 | |
| 27 Sept. | Light rain | 14° /9° | 3 mm | 1.9 | |
| 28 Sept. | Light rain | 13° /9° | 4.1 mm | 1.8 | |
| 29 Sept. | Patchy rain possible | 12° /9° | 1.4 mm | 1.8 | |
| 30 Sept. | Patchy rain possible | 12° /7° | 1 mm | 1.7 | |
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Important Notice
Our weather forecast for Helsinki 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 Helsinki forecast closer to your planned date for the most up-to-date weather information.
Change Month
Helsinki in September - FAQ
What are the expected maximum and minimum temperatures in Helsinki 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 Helsinki during September?
Moderate rainfall is anticipated in Helsinki during September, with a total of 69.3 mm spread over approximately 10 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in Helsinki during September?
The average wind speed in Helsinki during September is 19 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Helsinki
Explore the daily rainfall trends and prepare for Helsinkis September weather 💧
Typically, Helsinki has 10 rainy days in September with a total of 69.3 mm of rainfall.
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