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 31.6 °F. As the month progressed, temperatures tended to moderately fall, reaching an average of 30.3 °F by the end of September.
Expect significant rainfall in St. Petersburg during September, with an average of 19 rainy days.
- New! Chat with our AI weatherman - it’s amazing and free.
11
Dry days
19
Rainy days
0
Snow days
31°/25°
Temperatures
23 km/h
Avg max wind
72 %
Avg humidity
St. Petersburg in September average weather
Move between months or click on a day
| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  31° | 2  32° | 3  31° | 4 32° | 5 32° | 6 31° | 7 32° |
| 8  30° | 9  30° | 10 31° | 11 31° | 12  32° | 13 30° | 14 31° |
| 15 31° | 16 30° | 17 30° | 18 31° | 19 31° | 20 30° | 21  31° |
| 22 31° | 23  33° | 24 32° | 25 31° | 26  29° | 27 29° | 28 29° |
| 29 31° | 30 31° |
You can click on date
Access St. Petersburg weather forecasts with a simple click. Select any date for comprehensive insights on temperature, rainfall, and wind conditions.
Temperatures trend during September in St. Petersburg
See the weather trend as well as the moving average line
September weather day by day
Click on a date for more information
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| Sept. 1 | Moderate or heavy rain shower | 31° /26° | 6.7 mm | 7 | |
| Sept. 2 | Overcast | 32° /25° | 2.2 mm | 7 | |
| Sept. 3 | Partly cloudy | 31° /25° | 3.1 mm | 8 | |
| Sept. 4 | Partly cloudy | 32° /25° | 4 mm | 8 | |
| Sept. 5 | Overcast | 32° /25° | 5.7 mm | 7 | |
| Sept. 6 | Overcast | 31° /26° | 0.1 mm | 7 | |
| Sept. 7 | Partly cloudy | 32° /26° | 1.6 mm | 8 | |
| Sept. 8 | Thundery outbreaks possible | 30° /26° | 6.3 mm | 7 | |
| Sept. 9 | Patchy rain possible | 30° /25° | 2.5 mm | 7 | |
| Sept. 10 | Patchy rain possible | 31° /26° | 5.9 mm | 7 | |
| Sept. 11 | Thundery outbreaks possible | 31° /26° | 10.2 mm | 7 | |
| Sept. 12 | Fog | 32° /26° | 1.1 mm | 7 | |
| Sept. 13 | Partly cloudy | 30° /26° | 1.3 mm | 7 | |
| Sept. 14 | Partly cloudy | 31° /27° | 1 mm | 7 | |
| Sept. 15 | Mist | 31° /26° | 1.2 mm | 7 | |
| Sept. 16 | Moderate or heavy rain shower | 30° /25° | 12.3 mm | 7 | |
| Sept. 17 | Overcast | 30° /25° | 0.9 mm | 7 | |
| Sept. 18 | Moderate or heavy rain shower | 31° /27° | 4.3 mm | 7 | |
| Sept. 19 | Light rain shower | 31° /25° | 2.7 mm | 8 | |
| Sept. 20 | Light rain shower | 30° /25° | 8.4 mm | 8 | |
| Sept. 21 | Light drizzle | 31° /23° | 24.6 mm | 8 | |
| Sept. 22 | Patchy rain possible | 31° /23° | 11.7 mm | 8 | |
| Sept. 23 | Cloudy | 33° /24° | 0 mm | 8 | |
| Sept. 24 | Moderate or heavy rain shower | 32° /24° | 8.2 mm | 8 | |
| Sept. 25 | Thundery outbreaks possible | 31° /25° | 22 mm | 7 | |
| Sept. 26 | Patchy light rain with thunder | 29° /25° | 33.5 mm | 7 | |
| Sept. 27 | Light rain shower | 29° /27° | 27.2 mm | 7 | |
| Sept. 28 | Light rain shower | 29° /26° | 10 mm | 6 | |
| Sept. 29 | Light rain shower | 31° /25° | 11.3 mm | 7 | |
| Sept. 30 | Patchy rain possible | 31° /25° | 3.1 mm | 8 | |
| 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.
St. Petersburg in September - FAQ
What are the expected maximum and minimum temperatures in St. Petersburg during September?
During September, expect a variety of temperatures with highs around 31° and lows near 25°, suitable for diverse activities and preferences.
How much rainfall should be expected in St. Petersburg during September?
Significant rainfall exceeding 135.4 mm is expected in St. Petersburg during September, occurring over more than 19 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in St. Petersburg during September?
The average wind speed in St. Petersburg during September is 23 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 ☀️
Quick links
You are here
Where is St. Petersburg?Get accurate weather forecasts for St. Petersburg, located at latitude 27.771 and longitude -82.679. Stay updated with localized weather information tailored for St. Petersburg.
Related locations
Select a location for accurate weather forecast
More Locations Found a mistake?
We appreciate your attention to details. Tell us here.