Monthly climate guide
Saint Petersburg weather in September
September in Saint Petersburg is typically mild, with average daytime highs around 15°C (60°F) and night-time lows near 9°C (48°F). The month usually brings about 66 mm of rain (some rain) and is often cloudy. Daytime highs are 5°C cooler than August and 8°C warmer than October.
What stands out in September
- It cools down fast from here: October is about 8°C cooler.
- Compared with Astrakhan, Saint Petersburg runs roughly 10°C cooler this month.
- Seasonally, September counts as early autumn in Saint Petersburg.
Avg high
15°C
60°F
Avg low
9°C
48°F
Rainfall
66 mm
some rain
Humidity
87%
relative
Sky
70%
cloud · often cloudy
Saint Petersburg weather by month
Show the monthly averages as a table
| Month | Avg high | Avg low | Rain | Humidity | Cloud cover |
|---|---|---|---|---|---|
| January | -6°C / 20°F | -11°C / 12°F | 53 mm | 98% | 84% |
| February | -4°C / 24°F | -10°C / 14°F | 42 mm | 98% | 81% |
| March | 0°C / 32°F | -6°C / 21°F | 44 mm | 93% | 70% |
| April | 7°C / 45°F | 0°C / 32°F | 58 mm | 85% | 67% |
| May | 15°C / 59°F | 6°C / 44°F | 73 mm | 78% | 61% |
| June | 19°C / 66°F | 11°C / 52°F | 81 mm | 78% | 65% |
| July | 21°C / 70°F | 14°C / 57°F | 108 mm | 82% | 69% |
| August | 20°C / 68°F | 13°C / 55°F | 107 mm | 83% | 63% |
| September | 15°C / 60°F | 9°C / 48°F | 66 mm | 87% | 70% |
| October | 7°C / 45°F | 3°C / 37°F | 69 mm | 92% | 78% |
| November | 1°C / 34°F | -2°C / 28°F | 62 mm | 96% | 86% |
| December | -3°C / 27°F | -7°C / 20°F | 60 mm | 97% | 88% |
What to pack for September
- A warm sweater or fleece for layering
- A mid-weight jacket
- A small travel umbrella, just in case
Is September a good time to visit Saint Petersburg?
Compare the months in the chart above to find your ideal window.
Best time to visit Saint Petersburg →Other Russia cities in September
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Saint Petersburg weather in September. WeatherCompare, 2026 (NASA POWER / ERA5, 2011–2020 monthly averages). https://weathercompare.eu/weather/russia/saint-petersburg/september
<a href="https://weathercompare.eu/weather/russia/saint-petersburg/september">Saint Petersburg weather in September</a> (WeatherCompare)
<iframe src="https://weathercompare.eu/embed/russia/saint-petersburg" width="300" height="160" style="border:0;border-radius:12px" loading="lazy" title="Saint Petersburg weather in September"></iframe> <p style="font-size:12px"><a href="https://weathercompare.eu/weather/russia/saint-petersburg/september">Saint Petersburg weather in September</a> – WeatherCompare</p>
Saint Petersburg in September: quick answers
Is September a good time to visit Saint Petersburg?
Yes. September is one of the best months for Saint Petersburg, with highs around 15°C and about 66 mm of rain.
How warm is Saint Petersburg in September?
Average highs are about 15°C (60°F) and average lows about 9°C (48°F), based on 10 years of daily data.
Does it rain a lot in Saint Petersburg in September?
Saint Petersburg typically gets around 66 mm of rain in September — some rain.
Figures are long-term averages for the area around Saint Petersburg (NASA POWER / ERA5, 2011–2020), not a forecast for a specific year. For upcoming days, see the live multi-source forecast.