September weather forecast
Saint Petersburg, Russia

A stunning night panorama of the lit Kazan Cathedral in Saint Petersburg, Russia
A stunning night panorama of the lit Kazan Cathedral in Saint Petersburg, Russia

Weather in September

September, the first month of the autumn in Saint Petersburg, is also a moderate month, with an average temperature varying between 15°C (59°F) and 8.8°C (47.8°F).

Temperature

In September, the average high-temperature decreases from an agreeable 20.8°C (69.4°F) in August to a moderate 15°C (59°F). In Saint Petersburg, the average low-temperature is 8.8°C (47.8°F).

Humidity

The average relative humidity in September is 80%.

Rainfall

In Saint Petersburg, in September, it is raining for 20 days, with typically 64mm (2.52") of accumulated precipitation. Throughout the year, there are 173 rainfall days, and 662mm (26.06") of precipitation is accumulated.

Snowfall

In Saint Petersburg, Russia, snow does not fall in May through September.

Sea temperature

In September, the average sea temperature is 14°C (57.2°F).
Note: Swimming in 14°C (57.2°F) is considered life-threatening. Even a few minutes in 13°C (55.4°F) water is uncomfortable, and swimming below 10°C (50°F) may cause total loss of breathing control and cold shock, depending on a person's physique.

Daylight

In Saint Petersburg, Russia, the average length of the day in September is 12h and 52min.
On the first day of September, sunrise is at 05:53 and sunset at 20:03. On the last day of the month, sunrise is at 07:01 and sunset at 18:35 MSK.

Sunshine

In September, the average sunshine in Saint Petersburg, Russia, is 4.3h.

UV index

In Saint Petersburg, the average daily maximum UV index in September is 3. A UV Index reading of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV rays for the ordinary person.
Note: The daily maximum UV index of 3 in September interpret into the following advice:
Take precautions - Protection against sun damage is advised. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects.
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FAQ

What is the temperature in September in Saint Petersburg?

In Saint Petersburg, Russia, in September, the average high-temperature is 15°C (59°F), and the average low-temperature is 8.8°C (47.8°F).

What is the average humidity in September in Saint Petersburg?

The average relative humidity in September in Saint Petersburg is 80%.

How many days does it rain in September in Saint Petersburg?

In Saint Petersburg, Russia, in September, it is raining for 20 days, with typically 64mm (2.52") of accumulated precipitation.

When it does not snow in Saint Petersburg?

May through September are months without snowfall in Saint Petersburg.

Does it snow in Saint Petersburg in September?

In Saint Petersburg, Russia, in September, it doesn't snow. In October, it regularly snows.

What is the water temperature in September in Saint Petersburg?

In Saint Petersburg, the average seawater temperature in September is 14°C (57.2°F). Swimming in 14°C (57.2°F) is considered life-threatening. Even a few minutes in 13°C (55.4°F) water is uncomfortable, and swimming below 10°C (50°F) may cause total loss of breathing control and cold shock, depending on a person's physique.

How many hours of daylight does Saint Petersburg have in September?

The average day length in September in Saint Petersburg is 12h and 52min.

When are sunrise and sunset in September in Saint Petersburg?

In September, on the first day of the month, sunrise is at 05:53 and sunset at 20:03. On the last day of the month, in Saint Petersburg, Russia, sunrise is at 07:01 and sunset at 18:35 MSK.

How many hours of sunshine does Saint Petersburg have in September?

The average sunshine duration in September in Saint Petersburg, Russia, is 4.3h.

What is the UV index intensity in September in Saint Petersburg?

In Saint Petersburg, the average daily maximum UV index in September is 3. A UV Index estimate of 3 to 5 represents a moderate health threat from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average sunshine
Average UV index

Average temperature in September
Saint Petersburg, Russia

Average temperature in September - Saint Petersburg, Russia
  • Average high temperature in September: 15°C

The warmest month (with the highest average high temperature) is July (23°C).
The months with the lowest average high temperature are January and February (-3°C).

  • Average low temperature in September: 8.8°C

The month with the highest average low temperature is July (15°C).
The coldest month (with the lowest average low temperature) is February (-8.5°C).

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Average humidity in September
Saint Petersburg, Russia

Average humidity in September - Saint Petersburg, Russia
  • Average humidity in September: 80%

The month with the highest relative humidity is December (87%).
The month with the lowest relative humidity is May (65%).

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Average rainfall in September
Saint Petersburg, Russia

Average rainfall in September - Saint Petersburg, Russia
  • Average rainfall in September: 64mm

The wettest month (with the highest rainfall) is August (83mm).
The driest month (with the least rainfall) is April (31mm).

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Average rainfall days in September
Saint Petersburg, Russia

Average rainfall days in September - Saint Petersburg, Russia
  • Average rainfall days in September: 20 days

The months with the highest number of rainy days are September and October (20 days).
The month with the least rainy days is February (7 days).

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Average snowfall days in September
Saint Petersburg, Russia

Average snowfall days in September - Saint Petersburg, Russia
  • Average snowfall days in September: 0 days

The months with the highest number of snowfall days are January, February and December (17 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

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Average sea temperature in September
Saint Petersburg, Russia

Average sea temperature in September - Saint Petersburg, Russia
  • Average sea temperature in September: 14°C

The best month for swimming (with the highest average sea temperature) is July (19°C).
The coldest month (with the lowest average sea temperature) is February (-0.3°C).

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Average daylight in September /
Average sunshine in September
Saint Petersburg, Russia

Average daylight in September / Average sunshine in September - Saint Petersburg, Russia
  • Average daylight in September: 12h and 52min

The month with the longest days is June (Average daylight: 18h and 41min).
The month with the shortest days is December (Average daylight: 6h and 4min).

  • Average sunshine in September: 4h and 18min

The month with the most sunshine is June (Average sunshine: 9h and 12min).
The month with the least sunshine is December (Average sunshine: 0h and 24min).

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Average UV index in September
Saint Petersburg, Russia

Average UV index in September - Saint Petersburg, Russia
  • Average UV index in September: 3

The months with the highest UV index are June and July (UV index 5).
The months with the lowest UV index are January, November and December (UV index 0).

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