May is one of the warmer months of the year in Saint Petersburg, with average highs near 30.4°C and lows around 21.3°C (mean 25.9°C). It is one of the drier months, averaging 74 mm of rainfall and 69% relative humidity across the period.
May is one of the warmer months of the year in Saint Petersburg. Across 45 years of records, the warmest May in Saint Petersburg was 2024 — when the month averaged 28.6°C — while the coldest was 1983 at 23.9°C. Typical May days reach 30.4°C with nights near 21.3°C. The long-term trend is warming, about 0.4°C per decade.
May is one of the drier months in Saint Petersburg, averaging 74 mm of rainfall. The wettest May on record was 2018 with 256 mm, while the driest was 2000 at 11 mm.
Relative humidity in Saint Petersburg during May averages 69%. The most humid May was 1991 at 80%, and the least humid was 1981 at 61%.
May receives about 6.8 kWh/m²/day of solar energy in Saint Petersburg. The sunniest May was 2021 at 7.3 kWh/m²/day, and the cloudiest was 2018 at 5.6.
Average wind speed in Saint Petersburg during May is 2.7 m/s. The windiest May was 2007 at 3.4 m/s, while the calmest were 2003 and 2025 at 2.2 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 25.2°C | 25.7°C | 25.9°C | 26.1°C | 27.0°C | +1.8°C |
| Avg High | 29.9°C | 30.0°C | 30.5°C | 30.6°C | 31.6°C | +1.7°C |
| Avg Low | 20.5°C | 21.4°C | 21.2°C | 21.6°C | 22.4°C | +1.9°C |
| Avg Rain | 65 mm | 65 mm | 61 mm | 108 mm | 67 mm | +1 mm |
May temperatures in Saint Petersburg have risen by about 2.2°C between 1981–1985 and 2021–2025.
May has ranged from a record low of 13.2°C (1999) to a record high of 35.9°C (1990).
Rainfall in May is one of the drier months, averaging 74 mm, with a wettest year of 256 mm.
A good time to visit Saint Petersburg
May is a good time to visit Saint Petersburg, with days averaging 30.4°C and nights around 21.3°C (mean 25.9°C, warmer than Saint Petersburg's yearly average) and moderate rainfall. April and November are marginally more temperate, but May still suits most travellers.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 32.1°C | 27.9°C | 23.7°C | 35.2°C | 19.5°C | 83 mm | 67% | 2.2 m/s | 6.6 |
| 2024 🔥 | 33.4°C | 28.6°C | 23.8°C | 35.6°C | 21.1°C | 34 mm | 67% | 2.6 m/s | 7 |
| 2023 | 31.0°C | 26.3°C | 21.6°C | 33.8°C | 18.5°C | 101 mm | 68% | 2.7 m/s | 7 |
| 2022 | 31.3°C | 26.8°C | 22.4°C | 33.4°C | 17.5°C | 79 mm | 69% | 2.6 m/s | 7 |
| 2021 | 31.8°C | 26.8°C | 21.8°C | 33.8°C | 17.7°C | 15 mm | 62% | 3.1 m/s | 7.3 |
| 2020 | 29.9°C | 25.5°C | 21.1°C | 33.3°C | 14.3°C | 88 mm | 70% | 2.9 m/s | 6.9 |
| 2019 | 32.2°C | 27.3°C | 22.4°C | 35.7°C | 19.4°C | 76 mm | 68% | 2.5 m/s | 7 |
| 2018 🌧️ | 28.4°C | 24.9°C | 21.3°C | 31.9°C | 17.8°C | 256 mm | 79% | 3 m/s | 5.6 |
| 2017 | 31.5°C | 26.8°C | 22.0°C | 35.7°C | 17.3°C | 68 mm | 65% | 3.2 m/s | 7 |
| 2016 | 29.8°C | 25.5°C | 21.2°C | 32.5°C | 15.6°C | 132 mm | 68% | 2.5 m/s | 7 |
| 2015 | 31.3°C | 26.5°C | 21.8°C | 33.6°C | 16.0°C | 81 mm | 68% | 2.8 m/s | 7.2 |
| 2014 | 29.5°C | 25.2°C | 20.8°C | 31.9°C | 16.2°C | 170 mm | 73% | 2.5 m/s | 6.7 |
| 2013 | 29.3°C | 24.8°C | 20.3°C | 33.0°C | 16.0°C | 75 mm | 68% | 2.9 m/s | 6.7 |
| 2012 | 31.2°C | 26.8°C | 22.3°C | 34.6°C | 19.7°C | 104 mm | 66% | 2.6 m/s | 6.7 |
| 2011 | 31.5°C | 26.4°C | 21.3°C | 34.7°C | 16.5°C | 39 mm | 63% | 2.6 m/s | 7.2 |
| 2010 | 30.8°C | 26.6°C | 22.5°C | 33.0°C | 19.7°C | 84 mm | 73% | 2.5 m/s | 7 |
| 2009 | 28.8°C | 25.3°C | 21.8°C | 33.0°C | 18.3°C | 246 mm | 76% | 2.6 m/s | 6.3 |
| 2008 | 30.7°C | 26.0°C | 21.2°C | 34.3°C | 15.6°C | 31 mm | 68% | 3.1 m/s | 6.9 |
| 2007 | 30.4°C | 25.4°C | 20.4°C | 32.4°C | 16.2°C | 13 mm | 63% | 3.4 m/s | 6.8 |
| 2006 | 30.1°C | 25.6°C | 21.0°C | 34.1°C | 16.1°C | 33 mm | 66% | 2.7 m/s | 6.8 |
| 2005 | 28.8°C | 24.6°C | 20.4°C | 32.5°C | 14.9°C | 93 mm | 75% | 2.5 m/s | 6.5 |
| 2004 | 31.1°C | 26.2°C | 21.2°C | 34.3°C | 16.2°C | 39 mm | 65% | 2.6 m/s | 7 |
| 2003 | 29.9°C | 26.3°C | 22.7°C | 32.2°C | 20.3°C | 70 mm | 75% | 2.2 m/s | 6.9 |
| 2002 | 32.2°C | 26.9°C | 21.7°C | 35.3°C | 17.2°C | 55 mm | 65% | 3.2 m/s | 6.9 |
| 2001 | 30.6°C | 25.4°C | 20.3°C | 33.4°C | 17.5°C | 21 mm | 65% | 3 m/s | 7.1 |
| 2000 | 32.3°C | 26.9°C | 21.5°C | 34.7°C | 16.8°C | 11 mm | 62% | 2.9 m/s | 7.1 |
| 1999 | 30.2°C | 25.5°C | 20.7°C | 33.2°C | 13.2°C | 61 mm | 68% | 2.7 m/s | 6.9 |
| 1998 | 29.4°C | 25.4°C | 21.3°C | 32.6°C | 17.4°C | 46 mm | 75% | 2.4 m/s | 6.4 |
| 1997 | 28.8°C | 25.0°C | 21.1°C | 31.2°C | 14.5°C | 89 mm | 75% | 2.6 m/s | 6.4 |
| 1996 | 30.7°C | 26.1°C | 21.6°C | 33.8°C | 15.5°C | 70 mm | 71% | 2.5 m/s | 6.7 |
| 1995 | 32.2°C | 27.7°C | 23.1°C | 34.6°C | 19.9°C | 38 mm | 68% | 2.8 m/s | 7 |
| 1994 | 30.3°C | 26.0°C | 21.8°C | 32.4°C | 15.7°C | 38 mm | 68% | 2.6 m/s | 6.9 |
| 1993 | 29.4°C | 24.6°C | 19.8°C | 32.5°C | 16.4°C | 46 mm | 68% | 2.8 m/s | 6.7 |
| 1992 | 29.0°C | 24.1°C | 19.2°C | 31.6°C | 14.0°C | 29 mm | 68% | 2.9 m/s | 6.8 |
| 1991 | 29.1°C | 26.0°C | 22.9°C | 31.1°C | 20.3°C | 178 mm | 80% | 2.6 m/s | 6 |
| 1990 | 31.3°C | 26.7°C | 22.1°C | 35.9°C | 18.9°C | 58 mm | 68% | 2.9 m/s | 6.3 |
| 1989 | 31.1°C | 26.0°C | 20.9°C | 34.9°C | 16.1°C | 28 mm | 64% | 2.9 m/s | 6.8 |
| 1988 | 29.2°C | 24.3°C | 19.5°C | 33.2°C | 15.7°C | 42 mm | 67% | 3 m/s | 6.6 |
| 1987 | 28.9°C | 24.7°C | 20.5°C | 32.3°C | 16.6°C | 101 mm | 75% | 2.6 m/s | 6.6 |
| 1986 | 31.0°C | 25.9°C | 20.7°C | 35.8°C | 17.4°C | 48 mm | 64% | 2.6 m/s | 6.7 |
| 1985 | 31.0°C | 26.3°C | 21.6°C | 34.2°C | 18.6°C | 37 mm | 64% | 2.6 m/s | 6.7 |
| 1984 | 29.0°C | 24.9°C | 20.8°C | 32.1°C | 15.7°C | 106 mm | 71% | 2.8 m/s | 6.1 |
| 1983 ❄️ | 28.2°C | 23.9°C | 19.7°C | 32.2°C | 15.6°C | 62 mm | 73% | 2.7 m/s | — |
| 1982 | 29.1°C | 24.5°C | 20.0°C | 32.2°C | 16.7°C | 119 mm | 70% | 2.9 m/s | — |
| 1981 | 31.4°C | 26.0°C | 20.5°C | 35.2°C | 16.4°C | 45 mm | 61% | 3.1 m/s | — |
Actual recorded May data for each year, 1981–2025 — sourced from NASA POWER.
The average high in May is around 30.4°C with lows near 21.3°C (mean 25.9°C), based on 45 years of NASA POWER data.
May averages 74 mm of rainfall in Saint Petersburg, one of the drier months. The wettest on record was 256 mm in 2018.
The hottest May reached 35.9°C in 1990. The coldest dipped to 13.2°C in 1999.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average May temperatures have risen by about 2.2°C. Daytime highs moved from 29.7°C to 31.9°C and overnight lows from 20.5°C to 22.7°C over the same span.
May is one of the warmer months of the year in Saint Petersburg and one of the drier months, so plan for around 30.4°C daytime highs and 21.3°C at night.
Not quite — May is the 8th coolest month in Saint Petersburg, averaging 25.9°C.
For May in Saint Petersburg, pack light, breathable clothing and sun protection, with typical highs of 30.4°C and lows of 21.3°C. Bring an umbrella or light rain jacket too.
Relative humidity in May averages 69% — moderately humid.
Average wind speed in May is 2.7 m/s. The windiest May on record averaged 3.4 m/s (2007).
The wettest May on record was 2018 with 256 mm. On average, May sees 74 mm.
All figures are derived from NASA POWER (Prediction Of Worldwide Energy Resources), based on MERRA-2 satellite reanalysis, covering 1981–2025.
Explore how the weather in Saint Petersburg behaves each May, based on 45 years of NASA POWER climate data from 1981 to 2025. This page breaks down average temperatures, rainfall, humidity, wind and solar radiation for May specifically, along with year-by-year records and how the month has changed over the decades.
