Saint Petersburg is warmest in July, averaging 22° by day and 14° at night. The wettest month is August with 115 mm, and the year brings about 836 mm in total.
Month by month
| Month | High | Low | Rain | Sea | Daylight | Good for |
|---|---|---|---|---|---|---|
| January | -6° | -11° | 50 mm | 0° | 6.4 h | Cool |
| February | -4° | -10° | 56 mm | -1° | 8.7 h | Cool |
| March | 0° | -6° | 56 mm | -0° | 11.3 h | Cool |
| April | 7° | -0° | 57 mm | 3° | 14.2 h | Cool |
| May | 14° | 6° | 62 mm | 9° | 16.8 h | Mild |
| June | 21° | 11° | 84 mm | 15° | 18.4 h | Sightseeing |
| July | 22° | 14° | 93 mm | 18° | 17.7 h | Sightseeing |
| August | 21° | 13° | 115 mm | 19° | 15.3 h | Mild |
| September | 16° | 9° | 51 mm | 15° | 12.5 h | Mild |
| October | 9° | 3° | 84 mm | 9° | 9.7 h | Cool |
| November | 1° | -2° | 69 mm | 5° | 7.1 h | Cool |
| December | -5° | -7° | 59 mm | 2° | 5.6 h | Cool |
High and low are average daily maximum and minimum, rain is typical monthly total, sea is the average surface temperature, daylight is the hours between sunrise and sunset mid-month. Climate normals from NASA POWER and NOAA MUR — averages, not promises.
When to go
Beach weather: No month in Saint Petersburg combines swimming warmth with dry skies.
Walking the city: June and July — highs of 21–22° and no more than 93 mm of rain a month.