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St. Petersburg (FL)
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United States weather

Weather in St. Petersburg, Florida for September 2025

Your guide to St. Petersburg weather in September - trends and predictions

    Temperatures

  • Until now, September 2025 in St. Petersburg is slightly cooler than the historical average by -1.5 °F.

  • The forecast for the next days in St. Petersburg predicts temperatures to be around 30 °F, close to the historical average.

  • In general, the average temperature in St. Petersburg at the beginning of September is 30.9 °F. As the month progressed, temperatures tended to moderately fall, reaching an average of 29.4 °F by the end of September.

    • Rain 🌧️

  • St. Petersburg experiences heavy rainfall in September, with over 20 rainy days and an average total precipitation 233.3 mm.

    • More

  • New! Chat with our AI weatherman - it’s amazing and free.

Average dry days
2
Dry days
Average rainy days
28
Rainy days
Average snowy days
0
Snow days
Average temperatures
31°/26°
Temperatures
Average wind speed
24 km/h
Avg max wind
Average humidity
73 %
Avg humidity

St. Petersburg Weather September

Move between months or click on a day
August
October
Sun.Mon.Tue.Wed.Thu.Fri.Sat.
1
Moderate or heavy rain shower
30°
2
Overcast
31°
3
Partly cloudy
31°
4
Partly cloudy
31°
5
Overcast
31°
6
Overcast
31°
7
Partly cloudy
31°
8
Thundery outbreaks possible
29°
9
Patchy rain possible
29°
10
Moderate or heavy rain shower
30°
11
Thundery outbreaks possible
30°
12
Fog
31°
13
Partly cloudy
31°
14
Sunny
32°
15
Sunny
31°
16
Patchy rain possible
31°
17
Patchy rain possible
31°
18
Patchy rain possible
25°
19
Patchy rain possible
29°
20
Sunny
30°
21
Sunny
30°
22
Patchy rain possible
31°
23
Patchy rain possible
30°
24
Moderate rain
27°
25
Patchy rain possible
29°
26
Patchy rain possible
30°
27
Light rain shower
29°
28
Light rain shower
29°
29
Light rain shower
31°
30
Patchy rain possible
31°

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

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
Sept. 1 Moderate or heavy rain shower
Moderate or heavy rain shower
 30° /25° 4.5 mm 7
Sept. 2 Overcast
Overcast
 31° /25° 13 mm 7
Sept. 3 Partly cloudy
Partly cloudy
 31° /25° 2.1 mm 7
Sept. 4 Partly cloudy
Partly cloudy
 31° /25° 8.5 mm 7
Sept. 5 Overcast
Overcast
 31° /25° 8 mm 7
Sept. 6 Overcast
Overcast
 31° /26° 10.4 mm 7
Sept. 7 Partly cloudy
Partly cloudy
 31° /26° 21 mm 7
Sept. 8 Thundery outbreaks possible
Thundery outbreaks possible
 29° /26° 4.2 mm 7
Sept. 9 Patchy rain possible
Patchy rain possible
 29° /24° 21.9 mm 7
Sept. 10 Moderate or heavy rain shower
Moderate or heavy rain shower
 30° /25° 18.3 mm 6
Sept. 11 Thundery outbreaks possible
Thundery outbreaks possible
 30° /25° 9 mm 6
Sept. 12 Fog
Fog
 31° /25° 0.7 mm 7
Sept. 13 Partly cloudy
Partly cloudy
 31° /23° 0 mm 2.1
Sept. 14 Sunny
Sunny
 32° /23° 0 mm 2.1
Sept. 15 Sunny
Sunny
 31° /24° 0 mm 2.2
Sept. 16 Patchy rain possible
Patchy rain possible
 31° /25° 0.1 mm 2.2
Sept. 17 Patchy rain possible
Patchy rain possible
 31° /25° 1 mm 1.9
Sept. 18 Patchy rain possible
Patchy rain possible
 25° /24° 1.4 mm 0
Sept. 19 Patchy rain possible
Patchy rain possible
 29° /24° 1.2 mm 6
Sept. 20 Sunny
Sunny
 30° /25° 0 mm 7
Sept. 21 Sunny
Sunny
 30° /27° 0 mm 7
Sept. 22 Patchy rain possible
Patchy rain possible
 31° /27° 0.3 mm 6
Sept. 23 Patchy rain possible
Patchy rain possible
 30° /26° 1.2 mm 6
Sept. 24 Moderate rain
Moderate rain
 27° /25° 8.8 mm 6
Sept. 25 Patchy rain possible
Patchy rain possible
 29° /25° 3.1 mm 6
Sept. 26 Patchy rain possible
Patchy rain possible
 30° /26° 0.4 mm 6
Sept. 27 Light rain shower
Light rain shower
 29° /27° 27.2 mm 7
Sept. 28 Light rain shower
Light rain shower
 29° /26° 10 mm 6
Sept. 29 Light rain shower
Light rain shower
 31° /25° 11.3 mm 7
Sept. 30 Patchy rain possible
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.
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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 26°, suitable for diverse activities and preferences.
How much rainfall should be expected in St. Petersburg during September?
Significant rainfall exceeding 233.3 mm is expected in St. Petersburg during September, occurring over more than 28 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 24 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

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Location coordinates 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.

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