Climate averages 1991–2020
St. Petersburg weather
in August.
A hot, wet month: the warmest and the wettest of the year.
Long-term climate patterns, not a forecast for a particular trip.
August is a hot month in St. Petersburg: daytime highs average 29.9°C and nights cool to about 25.6°C. By daytime temperature it is the warmest month of the year.
Expect about 146 mm of rain on roughly 21 days, which makes August a wet month (the wettest month of the year). Daylight, from sunrise to sunset, lasts about 13 h 08 min on an average August day.
The nearest other city in this atlas is Largo (19 km away). In August its highs average 29.3°C, 0.6°C cooler than St. Petersburg, with 146 mm of rain.
Among the 498 cities listed in the United States, St. Petersburg ranks joint 247th of 498 for the warmest August highs and joint 469th of 498 for the driest August (rainfall, lowest first). The mean August high of those 498 cities is 29.9°C; St. Petersburg is level with that mean.
From August to September, average highs fall by 0.6°C to 29.2°C, and monthly rainfall falls from 146 mm to 139 mm.
The annual picture
August in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
St. Petersburg climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 19.2°C13.3°C | 13.3°C | 64 | 6.3 | 10.611 h |
| February | 20.1°C14.3°C | 14.3°C | 49 | 5.8 | 11.211 h |
| March | 22.1°C16.2°C | 16.2°C | 57 | 6.0 | 12.012 h |
| April | 25.0°C19.2°C | 19.2°C | 44 | 5.1 | 12.813 h |
| May | 27.9°C22.1°C | 22.1°C | 53 | 6.7 | 13.514 h |
| June | 29.4°C24.7°C | 24.7°C | 136 | 16.1 | 13.914 h |
| July | 29.8°C25.5°C | 25.5°C | 135 | 20.0 | 13.714 h |
| August, selected | 29.9°C25.6°C | 25.6°C | 146 | 21.2 | 13.113 h |
| September | 29.2°C24.7°C | 24.7°C | 139 | 15.8 | 12.312 h |
| October | 27.0°C21.8°C | 21.8°C | 63 | 7.1 | 11.512 h |
| November | 23.4°C17.8°C | 17.8°C | 42 | 4.2 | 10.811 h |
| December | 20.8°C15.1°C | 15.1°C | 53 | 5.6 | 10.410 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
August in nearby cities
- Largo in AugustUnited States · 19 kmHigh 29.3°C · Low 26.1°C · 146 mm rain
- Clearwater in AugustUnited States · 25 kmHigh 29.3°C · Low 26.0°C · 146 mm rain
- Town 'n' Country in AugustUnited States · 28 kmHigh 30.2°C · Low 25.2°C · 178 mm rain
- Tampa in AugustUnited States · 29 kmHigh 30.6°C · Low 24.4°C · 178 mm rain
- Brandon in AugustUnited States · 43 kmHigh 31.1°C · Low 24.2°C · 145 mm rain
- Lakeland in AugustUnited States · 78 kmHigh 31.1°C · Low 23.8°C · 159 mm rain
- Spring Hill in AugustUnited States · 80 kmHigh 30.9°C · Low 24.1°C · 207 mm rain
- Fort Myers in AugustUnited States · 152 kmHigh 31.2°C · Low 24.4°C · 164 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for St. Petersburg) is explained once on the St. Petersburg year overview and on the Sources, method and limits page.