St. Petersburg Weather in September
In September, St. Petersburg averages a high of 15°C (60°F) and a low of 9°C (48°F), from 54 years of daily records (1971–2025).
15°C
Average high
60°F
9°C
Average low
48°F
30°C
Record high
87°F · September 1, 1992
-3°C
Record low
26°F · September 28, 1976
What September Is Like in St. Petersburg
- September 2024 was the warmest September in 54 years of records, 4.2°C (7.6°F) above the long-run average.
- September in St. Petersburg has become 1.9°C (3.4°F) warmer on average: the 2010–2024 average against 1970–1989.
- The coldest September reading, -3°C (26°F) on September 28, 1976, has not been matched in 49 years.
- The September heat record, 30°C (87°F) on September 1, 1992, has stood for 33 years.
At least 1 mm of rain falls on 35% of September days, and the month averages 62 mm in total.
Warmest: 2024 (21.4°C)Latest: 2024 (21.4°C)10-year averageLong-run average (15.3°C)
Look Up a Day in September
See the weather in St. Petersburg on any September date, year by year.
Source: NOAA GHCN-Daily, St. Petersburg (1971–2025); Petrokrepost (2019–2025). Averages cover 1971–2025. How we compute this