St. Petersburg, FL Climate & Monthly Averages
The climate of St. Petersburg
Expect hot, humid summers and generally mild winters in St. Petersburg: that is what a humid subtropical climate means in practice. Highs peak at 88°F (31°C) in July and fall to 68°F (20°C) by January, with 10.2 hours of sun on an average day.
Climate quick facts
- Hottest month: July - highs near 88°F (31°C)
- Coldest month: January - highs near 68°F (20°C)
- Decade extremes (2015-2024): 98°F (36°C) high · 31°F (-1°C) low
- Wettest month: August (25 rainy days) · Sunniest: May (12.0 h sun/day)
- Climate type: humid subtropical
- Annual swing: 12°C between the average warmest and coolest month · day to night: 6°C
- Months averaging 30°C or hotter: 4
- Average humidity: 76%
Temperatures through the year
At its warmest, in July, St. Petersburg runs to 88°F (31°C) in the afternoon and back to 78°F (26°C) by dawn. January is the coolest month, with highs of 68°F (20°C) and lows near 55°F (13°C). Six of the twelve months pair mild highs with fewer than twelve wet days; the longest unbroken run is November through April.
Rain, sun and snow
The wettest month is August (8.5 inches (216 mm) across 25 days) and the driest March. Days and nights are about 6°C apart on average - narrower than about 87% of the cities we track. The gridded 2015-2024 daily record for this location tops out at 98°F (36°C) and bottoms at 31°F (-1°C) - decade extremes, not all-time station records.
How St. Petersburg compares
- St. Petersburg sits close to the middle of our dataset on most measures: 74°F (23°C) as an annual average, 49.5 inches (1258 mm) of precipitation and 10.2 hours of sun a day.
Ranked against every city in our dataset, each measured on the same ten-year window.
Monthly climate table
| Month | High | Low | Rain days | Precipitation | Sunshine | Daylight | Wet-day chance | Humidity |
|---|---|---|---|---|---|---|---|---|
| January | 68° | 55° | 8 | 2.9 in | 8.5 h/day | 10.6 h | 25% | 75% |
| February | 72° | 59° | 6 | 2.0 in | 9.6 h/day | 11.2 h | 22% | 78% |
| March | 76° | 63° | 6 | 1.8 in | 10.4 h/day | 11.9 h | 21% | 73% |
| April | 80° | 67° | 8 | 2.6 in | 11.5 h/day | 12.8 h | 27% | 71% |
| May | 85° | 72° | 10 | 3.2 in | 12.0 h/day | 13.5 h | 33% | 70% |
| June | 87° | 76° | 21 | 6.5 in | 11.2 h/day | 13.9 h | 71% | 78% |
| July | 88° | 78° | 25 | 6.8 in | 10.9 h/day | 13.7 h | 81% | 78% |
| August | 87° | 78° | 25 | 8.5 in | 10.4 h/day | 13.1 h | 80% | 79% |
| September | 86° | 76° | 20 | 6.8 in | 10.0 h/day | 12.3 h | 66% | 79% |
| October | 83° | 71° | 9 | 3.5 in | 9.9 h/day | 11.4 h | 30% | 74% |
| November | 77° | 65° | 6 | 2.0 in | 9.1 h/day | 10.7 h | 20% | 74% |
| December | 72° | 60° | 6 | 3.0 in | 8.5 h/day | 10.4 h | 19% | 78% |
St. Petersburg month by month
Average high and low for each month, with the bar showing where it sits in St. Petersburg's year (left is the coldest night, right is the warmest afternoon).
January
- Rain
- 8 days
- Sunshine
- 8.5 h
- Daylight
- 10.6 h
February
- Rain
- 6 days
- Sunshine
- 9.6 h
- Daylight
- 11.2 h
March
- Rain
- 6 days
- Sunshine
- 10.4 h
- Daylight
- 11.9 h
April
- Rain
- 8 days
- Sunshine
- 11.5 h
- Daylight
- 12.8 h
May
- Rain
- 10 days
- Sunshine
- 12.0 h
- Daylight
- 13.5 h
June
- Rain
- 21 days
- Sunshine
- 11.2 h
- Daylight
- 13.9 h
July
- Rain
- 25 days
- Sunshine
- 10.9 h
- Daylight
- 13.7 h
August
- Rain
- 25 days
- Sunshine
- 10.4 h
- Daylight
- 13.1 h
September
- Rain
- 20 days
- Sunshine
- 10.0 h
- Daylight
- 12.3 h
October
- Rain
- 9 days
- Sunshine
- 9.9 h
- Daylight
- 11.4 h
November
- Rain
- 6 days
- Sunshine
- 9.1 h
- Daylight
- 10.7 h
December
- Rain
- 6 days
- Sunshine
- 8.5 h
- Daylight
- 10.4 h
Warmer places to go, by month: January · February · March · April · May · June · July · August · September · October · November · December
Seasons in St. Petersburg
Spring (March through May)
Through spring, St. Petersburg is mild and warm: 80°F (27°C) by day, 67°F (20°C) after dark, and expect showers on roughly 25 days across the season. Daylight is generous - around 11.3 hours of sun a day.
Summer (June through August)
Summer sits firmly in the heat here - highs near 87°F (31°C), nights near 78°F (25°C), and rain falls on around 71 of the 90 days. Daylight is generous - around 10.8 hours of sun a day. With the moisture factored in, afternoons feel hotter than the reading suggests - the humidity and dew point converter shows why.
Fall (September through November)
Fall brings hot afternoons here - highs near 82°F (28°C), nights near 71°F (22°C), and rain falls on around 35 of the 90 days.
Winter (December through February)
Through winter, St. Petersburg is pleasantly warm: 71°F (21°C) by day, 58°F (14°C) after dark, and expect showers on roughly 20 days across the season.
Climate questions, answered
How cold does St. Petersburg get in winter?
Are nights cold in St. Petersburg?
How warm is St. Petersburg on average?
How much sun does St. Petersburg get?
Best time to visit St. Petersburg
November to April is the sweet spot for St. Petersburg - warm days, manageable rainfall and plenty of daylight line up. Expect 74°F (23°C) in the afternoon and around 7 days of rain in a typical month of it. For the same question asked the other way round, see where else is warm in November.
Pack for St. Petersburg with light clothing for the warm months, proper waterproofs rather than an umbrella - wet days are the norm here and moisture-wicking fabrics for the humidity. July nights average 78°F (26°C), so evenings rarely match the afternoons.
St. Petersburg temperature records (2015-2024)
Derived from ERA5 reanalysis data, 2015–2024. Official station records may differ. Need the precipitation in other units? The mm-to-inches rainfall converter handles it.