Last updated: June 24, 2025
In Petersburg, United States, the average temperature in September hovers around 19°C (67°F), with highs reaching up to 32°C (90°F) and lows dipping to a chilly 1°C (35°F). Expect around 108 mm (4.2 in) of precipitation spread across 9 days, along with an average humidity level of 68%.
In September in Petersburg, the average temperature is 19°C (67°F). Maximum temperatures can reach 32°C (90°F), while minimums can drop to as low as 1°C (35°F). It’s advisable to pack layers to stay comfortable while exploring the diverse climate.
In Petersburg in September, the precipitation amount is 108 mm (4.2 in) spread over 9 days.
In Petersburg in September, humidity is 68%. With an average temperature of 19°C (67°F), this humidity feels like a warm, enveloping blanket, making travel pleasant yet slightly muggy, which can be refreshing while exploring but may require occasional breaks to stay comfortable.
In Petersburg in September, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Petersburg.
UV Risk Categories
Weather in Petersburg varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Petersburg, focusing on differences in temperature, rainfall, humidity, and UV levels.
Temperature | Precipitation | Humidity | UV | |
---|---|---|---|---|
January Weather | 0°C (33°F) | 62 mm (2.4 inches) | 86% | moderate |
February Weather | 3°C (38°F) | 94 mm (3.7 inches) | 86% | moderate |
March Weather | 6°C (43°F) | 77 mm (3.0 inches) | 86% | high |
April Weather | 11°C (52°F) | 103 mm (4.0 inches) | 84% | very high |
May Weather | 16°C (62°F) | 124 mm (4.9 inches) | 78% | very high |
June Weather | 21°C (69°F) | 100 mm (4.0 inches) | 79% | very high |
July Weather | 24°C (75°F) | 89 mm (3.5 inches) | 70% | very high |
August Weather | 22°C (72°F) | 95 mm (3.8 inches) | 59% | very high |
September Weather | 19°C (67°F) | 108 mm (4.2 inches) | 68% | very high |
October Weather | 14°C (57°F) | 106 mm (4.2 inches) | 80% | high |
November Weather | 6°C (42°F) | 64 mm (2.5 inches) | 86% | moderate |
December Weather | 3°C (37°F) | 87 mm (3.4 inches) | 85% | moderate |