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Weather in St.-Petersburg for September 2026

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

    Official Weather Alert ⚠️

  • Other Dangers Warning - See hour by hour.

    • Temperatures

  • Until now, September 2026 in St.-Petersburg is cooler than usual, with temperatures averaging 16.4 °C, this is 4.1 °C below the typical seasonal average.

  • Expect cooler weather in the next days in St.-Petersburg with the forecast suggesting a temperature of 16.1 °C, lower than the historical average.

  • In general, the average temperature in St.-Petersburg at the beginning of September is 20.4 °C. As the month progressed, temperatures tended to significantly cool down, reaching an average of 15.6 °C by the end of September.

    • Rain 🌧️

  • St.-Petersburg experiences moderate rainfall in September, with an average of 7 rainy days and a total precipitation of 24.4 mm.

Average dry days
23
Dry days
Average rainy days
7
Rainy days
Average snowy days
0
Snow days
Average temperatures
19°/10°
Temperatures
Average wind speed
16 km/h
Avg max wind
Average humidity
72 %
Avg humidity

St.-Petersburg Weather September

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

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
1 Sept. Mist
Mist
 20° /12° 1.8 mm 4
2 Sept. Cloudy
Cloudy
 21° /11° 0.2 mm 4
3 Sept. Moderate or heavy rain shower
Moderate or heavy rain shower
 21° /11° 4.2 mm 5
4 Sept. Partly cloudy
Partly cloudy
 20° /11° 6.8 mm 4
5 Sept. Patchy rain possible
Patchy rain possible
 21° /12° 0.4 mm 4
6 Sept. Cloudy
Cloudy
 20° /10° 0.2 mm 4
7 Sept. Sunny
Sunny
 20° /9° 0 mm 5
8 Sept. Sunny
Sunny
 21° /10° 0 mm 4
9 Sept. Partly cloudy
Partly cloudy
 23° /11° 0.6 mm 5
10 Sept. Patchy rain possible
Patchy rain possible
 17° /11° 9.9 mm 0.5
11 Sept. Light rain shower
Light rain shower
 15° /9° 4.6 mm 1
12 Sept. Patchy rain possible
Patchy rain possible
 15° /9° 1.7 mm 1.9
13 Sept. Sunny
Sunny
 16° /8° 6.9 mm 2.2
14 Sept. Mist
Mist
 16° /11° 0.5 mm 5
15 Sept. Overcast
Overcast
 16° /11° 0 mm 4
16 Sept. Overcast
Overcast
 18° /10° 0 mm 5
17 Sept. Overcast
Overcast
 13° /10° 2.3 mm 3
18 Sept. Mist
Mist
 16° /11° 0.3 mm 5
19 Sept. Overcast
Overcast
 16° /11° 0 mm 4
20 Sept. Sunny
Sunny
 18° /10° 0 mm 5
21 Sept. Cloudy
Cloudy
 18° /9° 0 mm 5
22 Sept. Sunny
Sunny
 17° /8° 0 mm 5
23 Sept. Overcast
Overcast
 15° /9° 0.1 mm 4
24 Sept. Light rain shower
Light rain shower
 15° /7° 0.7 mm 4
25 Sept. Overcast
Overcast
 17° /8° 0.1 mm 4
26 Sept. Overcast
Overcast
 17° /10° 0.9 mm 4
27 Sept. Patchy rain possible
Patchy rain possible
 16° /9° 2.2 mm 4
28 Sept. Mist
Mist
 16° /9° 0.5 mm 4
29 Sept. Sunny
Sunny
 15° /6° 0.6 mm 4
30 Sept. Light rain shower
Light rain shower
 13° /5° 1.8 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 19° and cooler nights around 10°. 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 24.4 mm across approximately 7 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 💧
Typically, St.-Petersburg has 7 rainy days in September with a total of 24.4 mm of rainfall.

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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Location coordinates Where is St.-Petersburg?

Get accurate weather forecasts for St.-Petersburg, located at latitude 59.939 and longitude 30.314. Stay updated with localized weather information tailored for St.-Petersburg.

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