St.-Petersburg
September
Weather in St.-Petersburg for September 2025
Your guide to St.-Petersburg weather in September - trends and predictions
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 17.4 °C by the end of September.
The climate of St.-Petersburg in September is notably wet, with an average of 11 rainy days.
Is September a good time to visit St.-Petersburg? check out the best time to travel to St.-Petersburg page.
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19
Dry days
11
Rainy days
0
Snow days
20°/11°
Temperatures
18 km/h
Avg max wind
73 %
Avg humidity
St.-Petersburg in September average weather
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| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  21° | 2  22° | 3  22° | 4  23° | 5 23° | 6 20° | 7 20° |
| 8  22° | 9 22° | 10 24° | 11 23° | 12  24° | 13 24° | 14  23° |
| 15  20° | 16 22° | 17 22° | 18 17° | 19 21° | 20  17° | 21 18° |
| 22 17° | 23 19° | 24 19° | 25 19° | 26 19° | 27 17° | 28 18° |
| 29 16° | 30 14° |
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Temperatures trend during September in St.-Petersburg
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 | 21° /13° | 3.7 mm | 5 | |
| 2 Sept. | Cloudy | 22° /12° | 0.1 mm | 5 | |
| 3 Sept. | Moderate or heavy rain shower | 22° /13° | 6.2 mm | 6 | |
| 4 Sept. | Partly cloudy | 23° /12° | 0 mm | 7 | |
| 5 Sept. | Patchy rain possible | 23° /12° | 0.3 mm | 6 | |
| 6 Sept. | Cloudy | 20° /10° | 0.2 mm | 5 | |
| 7 Sept. | Partly cloudy | 20° /9° | 0 mm | 6 | |
| 8 Sept. | Mist | 22° /11° | 0 mm | 6 | |
| 9 Sept. | Partly cloudy | 22° /10° | 0 mm | 6 | |
| 10 Sept. | Partly cloudy | 24° /11° | 0 mm | 7 | |
| 11 Sept. | Partly cloudy | 23° /13° | 0.1 mm | 6 | |
| 12 Sept. | Sunny | 24° /14° | 0.3 mm | 6 | |
| 13 Sept. | Cloudy | 24° /14° | 0.9 mm | 6 | |
| 14 Sept. | Moderate rain | 23° /11° | 3.6 mm | 6 | |
| 15 Sept. | Overcast | 20° /10° | 0 mm | 6 | |
| 16 Sept. | Partly cloudy | 22° /10° | 0 mm | 6 | |
| 17 Sept. | Light rain shower | 22° /11° | 0.8 mm | 5 | |
| 18 Sept. | Mist | 17° /8° | 0 mm | 4 | |
| 19 Sept. | Patchy rain possible | 21° /8° | 1.2 mm | 5 | |
| 20 Sept. | Light rain | 17° /12° | 1.6 mm | 4 | |
| 21 Sept. | Patchy rain possible | 18° /10° | 0.1 mm | 5 | |
| 22 Sept. | Cloudy | 17° /7° | 0 mm | 4 | |
| 23 Sept. | Patchy rain possible | 19° /9° | 0.8 mm | 4 | |
| 24 Sept. | Light rain shower | 19° /10° | 0.4 mm | 5 | |
| 25 Sept. | Overcast | 19° /11° | 0.1 mm | 5 | |
| 26 Sept. | Overcast | 19° /11° | 1.4 mm | 5 | |
| 27 Sept. | Patchy rain possible | 17° /11° | 3.3 mm | 4 | |
| 28 Sept. | Mist | 18° /12° | 0.8 mm | 4 | |
| 29 Sept. | Sunny | 16° /8° | 0.9 mm | 5 | |
| 30 Sept. | Light rain shower | 14° /8° | 2.7 mm | 4 | |
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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.
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 43.2 mm across approximately 11 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 18 km/h, suggesting breezy to windy conditions, depending on your activities.
What to pack to St.-Petersburg in September?
As you prepare for your trip to St.-Petersburg 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 St.-Petersburg, 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 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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