St.-Petersburg (Saint Petersburg)
September
Weather in St.-Petersburg for September 2025
Your guide to St.-Petersburg weather in September - trends and predictions
Пожарная опасность - See hour by hour.
Until now, September 2025 in St.-Petersburg is slightly cooler than the historical average by -1 °C.
The forecast for the next days in St.-Petersburg predicts a temperature of 13.8 °C, which is cooler than the historical average.
In general, the average temperature in St.-Petersburg at the beginning of September is 21.6 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 12 °C by the end of September.
St.-Petersburg experiences moderate rainfall in September, with an average of 8 rainy days and a total precipitation of 29.2 mm.
Official Weather Alert ⚠️
Temperatures
Rain 🌧️
22
Dry days
8
Rainy days
0
Snow days
20°/11°
Temperatures
16 km/h
Avg max wind
70 %
Avg humidity
St.-Petersburg Weather September
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Temperatures trend during September in St.-Petersburg
See the weather trend as well as the moving average line
September weather in St.-Petersburg day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. |  Light rain shower | 20° /12° | 2.4 mm | 5 | |
| 2 Sept. |  Cloudy | 22° /11° | 0.1 mm | 5 | |
| 3 Sept. |  Moderate or heavy rain shower | 22° /11° | 4.1 mm | 6 | |
| 4 Sept. |  Partly cloudy | 22° /12° | 0.7 mm | 6 | |
| 5 Sept. | Patchy rain possible | 22° /13° | 0.2 mm | 5 | |
| 6 Sept. | Cloudy | 22° /11° | 0.1 mm | 5 | |
| 7 Sept. |  Sunny | 21° /10° | 0 mm | 6 | |
| 8 Sept. | Sunny | 22° /11° | 0 mm | 6 | |
| 9 Sept. | Partly cloudy | 23° /10° | 0 mm | 6 | |
| 10 Sept. | Partly cloudy | 24° /12° | 0 mm | 6 | |
| 11 Sept. | Partly cloudy | 23° /12° | 0.1 mm | 6 | |
| 12 Sept. | Sunny | 23° /13° | 0.2 mm | 6 | |
| 13 Sept. | Cloudy | 23° /13° | 0.6 mm | 6 | |
| 14 Sept. |  Moderate rain | 22° /11° | 2.5 mm | 5 | |
| 15 Sept. |  Overcast | 20° /10° | 0.1 mm | 5 | |
| 16 Sept. | Patchy rain possible | 18° /14° | 1.7 mm | 0.3 | |
| 17 Sept. | Patchy rain possible | 15° /10° | 0.2 mm | 0.4 | |
| 18 Sept. | Patchy rain possible | 18° /9° | 1.4 mm | 0.5 | |
| 19 Sept. | Patchy rain possible | 16° /10° | 4.5 mm | 0.3 | |
| 20 Sept. | Patchy rain possible | 17° /11° | 2.3 mm | 0.2 | |
| 21 Sept. | Patchy rain possible | 16° /9° | 0.5 mm | 3 | |
| 22 Sept. | Partly cloudy | 13° /9° | 0 mm | 4 | |
| 23 Sept. | Patchy rain possible | 10° /8° | 0.2 mm | 2 | |
| 24 Sept. | Patchy rain possible | 9° /7° | 1.7 mm | 2 | |
| 25 Sept. | Patchy rain possible | 13° /9° | 0.4 mm | 3 | |
| 26 Sept. | Patchy rain possible | 15° /8° | 0.3 mm | 3 | |
| 27 Sept. | Patchy rain possible | 13° /6° | 0.3 mm | 2 | |
| 28 Sept. | Patchy rain possible | 12° /8° | 0.9 mm | 2 | |
| 29 Sept. | Patchy rain possible | 8° /5° | 0.1 mm | 2 | |
| 30 Sept. | Light rain shower | 14° /8° | 2.7 mm | 4 | |
| Next | |||||
Important Notice
Our weather forecast for St.-Petersburg 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 St.-Petersburg forecast closer to your planned date for the most up-to-date weather information.
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St.-Petersburg in September - FAQ
What are the expected maximum and minimum temperatures in St.-Petersburg during September?
Enjoy moderate daytime temperatures of up to 20° and cooler nights around 11°. Ideal for a range of outdoor activities, from hiking to city tours.
How much rainfall should be expected in St.-Petersburg during September?
In September, St.-Petersburg can expect light to moderate rainfall, totaling 29.2 mm across approximately 8 days. Occasional showers are possible, and planning ahead for them could be helpful.
What are the typical wind conditions in St.-Petersburg during September?
The average wind speed in St.-Petersburg during September is 16 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in St.-Petersburg
Explore the daily rainfall trends and prepare for St.-Petersburgs September weather 💧
UV exposure in St.-Petersburg during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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