May
OK
15.5°C / 6.4°C
17 rain days
cool, very wet
Best time to visit St. Petersburg
St. Petersburg, Russia — ranked month by month from data: temperature, rainfall, snow, and peak hazard seasons. Every month has trade-offs — pick what you can tolerate.
Best · May & April
About St. Petersburg
Saint Petersburg, formerly known as Petrograd (Петроград), and later Leningrad (Ленинград), is the second-largest city in Russia, after Moscow, the nation's capital. Situated on the Neva River at the head of the Gulf of Finland on the Baltic Sea, its area of 1,439 square kilometers (556 sq mi) makes it the smallest administrative division of Russia by area. The city had a population of 5,601,911 residents as of 2021, with more than 6.4 million people living in the metropolitan area.
— condensed from Wikipedia ("Saint Petersburg")
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Going to St. Petersburg in May?
See exactly what to pack for May's weather — a climate-based list, not generic advice.
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OK — shoulder months
April
OK
8.9°C / 0.1°C
16 rain days
chilly, very wet
Months to skip
June
Skip
20.4°C / 12.1°C
19 rain days
mild, very wet
- extremely wet (19 rain days)
August
Skip
20.8°C / 13.4°C
21 rain days
mild, very wet
- extremely wet (21 rain days)
July
Skip
21.9°C / 14.3°C
22 rain days
mild, very wet
- extremely wet (22 rain days)
September
Skip
15.3°C / 9°C
20 rain days
cool, very wet
- extremely wet (20 rain days)
October
Skip
8°C / 3.2°C
21 rain days
chilly, very wet
- extremely wet (21 rain days)
November
Skip
2.2°C / -1.1°C
20 rain days
cold, freezing nights, very wet
- freezing at night (-1.1°C)
- extremely wet (20 rain days)
March
Skip
2.6°C / -4.3°C
18 rain days
cold, freezing nights, very wet
- freezing at night (-4.3°C)
- extremely wet (18 rain days)
December
Skip
-0.8°C / -4.3°C
20 rain days
cold, freezing nights, very wet
- freezing at night (-4.3°C)
- extremely wet (20 rain days)
February
Skip
-1.5°C / -6.3°C
18 rain days
cold, freezing nights, very wet
- bitterly cold (overnight -6.3°C)
- extremely wet (18 rain days)
January
Skip
-3.3°C / -7.5°C
21 rain days
cold, freezing nights, very wet
- bitterly cold (overnight -7.5°C)
- extremely wet (21 rain days)
How we ranked these
Each month is scored on temperature comfort (18–27°C avg high is the sweet spot), rainfall (more rain days = lower score), snow days, and peak hazard seasons (hurricanes, monsoons, etc.). Green-tier months are within ideal range with no major issues. Yellow are workable but with trade-offs. Red has at least one significant problem — extreme heat or cold, heavy rain, or peak storm season.