Click on a day for an hourly weather forecast
The temperatures in Saint Petersburg in September are quite cold with temperatures between 9°C and 15°C, warm clothes are a must.
You can expect about 3 to 8 days of rain in Saint Petersburg during the month of September. It’s a good idea to bring along your umbrella so that you don’t get caught in poor weather.
Our weather forecast can give you a great sense of what weather to expect in Saint Petersburg in September 2025.
If you’re planning to visit Saint Petersburg in the near future, we highly recommend that you review the 14 day weather forecast for Saint Petersburg before you arrive.
| Month | Temperatures | Rainy Days | Dry Days | Snowy Days | Rainfall | Weather | More details |
|---|---|---|---|---|---|---|---|
| January | -5° / -9° | 4 | 4 | 23 | 50 mm | Awful | Saint Petersburg in January |
| February | -3° / -8° | 3 | 3 | 23 | 60 mm | Awful | Saint Petersburg in February |
| March | 0° / -5° | 7 | 5 | 20 | 50 mm | Awful | Saint Petersburg in March |
| April | 8° / 1° | 7 | 14 | 9 | 63 mm | Awful | Saint Petersburg in April |
| May | 16° / 7° | 6 | 24 | 1 | 63 mm | Good | Saint Petersburg in May |
| June | 20° / 11° | 5 | 25 | 0 | 73 mm | Good | Saint Petersburg in June |
| July | 23° / 14° | 5 | 26 | 0 | 83 mm | Perfect | Saint Petersburg in July |
| August | 21° / 13° | 6 | 25 | 0 | 101 mm | Good | Saint Petersburg in August |
| September | 15° / 9° | 5 | 25 | 0 | 60 mm | Good | Saint Petersburg in September |
| October | 8° / 3° | 8 | 19 | 5 | 65 mm | Awful | Saint Petersburg in October |
| November | 3° / 0° | 8 | 13 | 10 | 66 mm | Awful | Saint Petersburg in November |
| December | -2° / -5° | 6 | 5 | 22 | 61 mm | Awful | Saint Petersburg in December |