Saint Petersburg weather in August
In August, Saint Petersburg has an average high of 20 °C69 °F and an average low of 13 °C55 °F, with about 98 mm3.8 in of precipitation. It is the 2nd warmest month of the year and ranks 2nd for precipitation.
How August compares with other months
Compared with July, August is 1.8 °C3.2 °F cooler on average. Compared with September, August is 5 °C8.9 °F warmer on average and wetter by 35 mm1.4 in. Daylight lasts about 15.6 hours around the middle of the month. Average relative humidity is 83% and the average cloud amount 64%.
Is August a good time to visit Saint Petersburg?
Yes — August is one of the most comfortable months to visit Saint Petersburg by our comfort score, which favours average highs of 21–28 °C, lows above 5 °C, little rain and moderate humidity.
What to wear in August
For Saint Petersburg in August, pack light layers — T-shirts plus a light sweater or jacket and an umbrella or light rain jacket.
August in nearby places
| Place | High °C°F | Low °C°F | Precip. mmin |
|---|---|---|---|
| Saint Petersburg | 2069 | 1355 | 983.8 |
| Velikiy Novgorod | 2170 | 1355 | 983.8 |
| Pskov | 2170 | 1355 | 973.8 |
| Lahti | 2068 | 1253 | 722.9 |
| Vantaa | 2169 | 1355 | 702.8 |
| Helsinki | 1966 | 1560 | 712.8 |
| Petrozavodsk | 1966 | 1355 | 1124.4 |
| Espoo | 1967 | 1559 | 732.9 |
| Tallinn | 2069 | 1559 | 722.8 |
Other months in Saint Petersburg
- January−6 °C20 °F / −11 °C11 °F
- February−5 °C23 °F / −11 °C12 °F
- March0 °C32 °F / −6 °C21 °F
- April8 °C46 °F / 0 °C32 °F
- May15 °C60 °F / 7 °C44 °F
- June19 °C66 °F / 11 °C52 °F
- July22 °C72 °F / 15 °C58 °F
- August20 °C69 °F / 13 °C55 °F
- September15 °C59 °F / 8 °C47 °F
- October7 °C45 °F / 2 °C36 °F
- November1 °C33 °F / −3 °C27 °F
- December−4 °C25 °F / −8 °C18 °F
Frequently asked questions
How warm is Saint Petersburg in August?
In August the average high in Saint Petersburg is 20 °C (69 °F) and the average low is 13 °C (55 °F).
Does it rain a lot in Saint Petersburg in August?
On average about 98 mm (3.8 in) of precipitation falls in August; it ranks 2nd of the 12 months.
Is August the warmest month in Saint Petersburg?
No. The warmest month in Saint Petersburg is July, with an average high of 22 °C (72 °F). The coldest month is January, with an average low of -11 °C (11 °F).
How long is the day in Saint Petersburg in August?
In the middle of August the day in Saint Petersburg lasts about 15.6 hours from sunrise to sunset. The value is calculated from the position of the city and the sun.
How humid is Saint Petersburg in August?
The average relative humidity in August is about 83%. This is a long-term average for the whole day.
How cloudy is Saint Petersburg in August?
On average about 64% of the sky is covered by cloud in August. This is the mean cloud amount from satellite data, not the number of sunny days.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station, so they can differ from airport records — most of all on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.