| Month | High | Low | Rain | Wet days | Score |
|---|---|---|---|---|---|
| January | 20.6° | 13° | 52.7mm | 8 | 84 |
| February | 22.5° | 14.8° | 42.2mm | 6.4 | 87 |
| March | 24.8° | 17.2° | 56.3mm | 6 | 88 |
| April | 27.5° | 20° | 45.7mm | 4.9 | 88 |
| May | 30.2° | 22.9° | 64.6mm | 5.6 | 76 |
| June | 31.7° | 25.1° | 172.5mm | 13.4 | 54 |
| July | 32.2° | 25.9° | 195.4mm | 15.7 | 49 |
| August | 32.3° | 26° | 213.3mm | 16.5 | 49 |
| September | 31.4° | 25.2° | 178.5mm | 14.1 | 54 |
| October | 28.9° | 22.6° | 43.8mm | 6 | 80 |
| November | 25° | 18.1° | 38.1mm | 5.1 | 90 |
| December | 22.3° | 15.2° | 57.3mm | 5.9 | 88 |
January in St. Petersburg averages a daily high of 20.6°C with nights around 13°C. Expect roughly 8 wet days totalling 52.7mm. Comfortable conditions for being outdoors all day.
February in St. Petersburg averages a daily high of 22.5°C with nights around 14.8°C. Expect roughly 6.4 wet days totalling 42.2mm. Comfortable conditions for being outdoors all day.
March in St. Petersburg averages a daily high of 24.8°C with nights around 17.2°C. Expect roughly 6 wet days totalling 56.3mm. Comfortable conditions for being outdoors all day.
April in St. Petersburg averages a daily high of 27.5°C with nights around 20°C. Expect roughly 4.9 wet days totalling 45.7mm. Comfortable conditions for being outdoors all day.
May in St. Petersburg averages a daily high of 30.2°C with nights around 22.9°C. Expect roughly 5.6 wet days totalling 64.6mm. Comfortable conditions for being outdoors all day.
June in St. Petersburg averages a daily high of 31.7°C with nights around 25.1°C. Expect roughly 13.4 wet days totalling 172.5mm. Demanding conditions — pack for it and plan indoor options.
July in St. Petersburg averages a daily high of 32.2°C with nights around 25.9°C. Expect roughly 15.7 wet days totalling 195.4mm. Demanding conditions — pack for it and plan indoor options.
August in St. Petersburg averages a daily high of 32.3°C with nights around 26°C. Expect roughly 16.5 wet days totalling 213.3mm. Demanding conditions — pack for it and plan indoor options.
September in St. Petersburg averages a daily high of 31.4°C with nights around 25.2°C. Expect roughly 14.1 wet days totalling 178.5mm. Demanding conditions — pack for it and plan indoor options.
October in St. Petersburg averages a daily high of 28.9°C with nights around 22.6°C. Expect roughly 6 wet days totalling 43.8mm. Comfortable conditions for being outdoors all day.
November in St. Petersburg averages a daily high of 25°C with nights around 18.1°C. Expect roughly 5.1 wet days totalling 38.1mm. Comfortable conditions for being outdoors all day.
December in St. Petersburg averages a daily high of 22.3°C with nights around 15.2°C. Expect roughly 5.9 wet days totalling 57.3mm. Comfortable conditions for being outdoors all day.
Each month scores out of 100. It starts at 100 and loses points for daytime highs outside a 20–27°C band, for wet days, and for nights below 2°C. Nothing else is weighted in — no crowd data, no prices, no opinion. St. Petersburg peaks at 90.
Based on 30 years of records, November–April scores highest for comfort in St. Petersburg, balancing daytime temperature against rainfall.
August is the warmest, averaging a daily high of 32.3°C.
August is the wettest, averaging 213.3mm of rain across roughly 16.5 wet days.
January is the coolest month, with average daily highs around 20.6°C.