St Petersburg weather in September 2025

Q: How warm is it in St Petersburg in September?

Daytime temperatures usually reach 15°C in St Petersburg in September, falling to 8°C at night.

Q: How sunny is it in St Petersburg in September?

There are normally 4 hours of bright sunshine each day in St Petersburg in September - that's 34% of daylight hours.

Q: How warm is the sea around St Petersburg in September?

The average sea temperature around St Petersburg in September is 13°C.

Q: Does it rain in St Petersburg in September?

There are usually 17 days with some rain in St Petersburg in September and the average monthly rainfall is 70mm.

Expect 59°F daytime maximum temperatures in the shade with on average 4 hours of sunshine per day in St Petersburg in September. Check more long-term weather averages for St Petersburg in September before you book your next holiday to Russia (Europe) in 2025/2026.

59
59°F max day temperature
4
4 hours of sunshine per day
17
17 days with some rainfall
46
46°F min night temperature
13
13 hours of daylight per day
0
No heat & humidity
2.8
2.8 inches of monthly rainfall
3
3 (Moderate) UV index
55
55°F sea temperature

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The September weather guide for Russia (Europe) (St Petersburg) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.

Metric (°C) | Imperial (°F)

How warm is it in St Petersburg in September?

Daytime temperatures usually reach 59°F in St Petersburg in September, falling to 46°F at night.

How sunny is it in St Petersburg in September?

There are normally 4 hours of bright sunshine each day in St Petersburg in September - that's 34% of daylight hours.

How warm is the sea around St Petersburg in September?

The average sea temperature around St Petersburg in September is 55°F.

Does it rain in St Petersburg in September?

There are usually 17 days with some rain in St Petersburg in September and the average monthly rainfall is 2.8 inches.

St Petersburg September sunrise & sunset times

Browse the sunrise and sunset times for St Petersburg in September 2025. Select a month to view St Petersburg sunrise and sunset times for the next 12 months.

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