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August Weather in Petersburg, United States

Last updated: June 24, 2025

In Petersburg, United States, the average temperature in August hovers around 15°C (59°F), with minimums dipping to 9°C (48°F) and maximums soaring up to 30°C (86°F). Prepare for a rainy month with estimated precipitation of 297 mm (11.7 in) over 20 days, contributing to an average humidity level of a staggering 111%.

August Temperature in Petersburg

In August in Petersburg, the average temperature is 15°C (59°F). Maximums can reach 30°C (86°F), while minimums can drop to as low as 9°C (48°F). This variety in temperature makes it a great time for travelers to enjoy a mix of outdoor activities and cozy indoor experiences.

August Weather in Petersburg: Daily Temperature Highs, Lows, and Averages

The chart illustrates August temperature patterns in Petersburg, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Petersburg, August typically has an average temperature of 15°C (59°F), with highs reaching up to 30°C (86°F) and lows dropping to around 9°C (48°F).
JanFebMarAprMayJunJulAugSepOctNovDec302935425055595854433732
Data source: Temperature data for Petersburg generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

August Precipitation in Petersburg

In Petersburg in August, the total precipitation amount is 297 mm (11.7 in) spread over 20 days.

August Precipitation Trends in Petersburg

The chart displays monthly precipitation patterns in Petersburg, with values for each month alongside August’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how August’s conditions compare to those of other months. In Petersburg, August typically receives around 297 mm (11.7 inches) of precipitation spread over approximately 20 days.
JanFebMarAprMayJunJulAugSepOctNovDec225177177190160206195297288276309258
Data source: Precipitation data for August generated using information from the Copernicus Climate Change Service.
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August Humidity in Petersburg

In Petersburg in August, humidity is 111%. With an average temperature of 15°C (59°F), this humidity feels like traveling through a dense fog that clings to your skin, making even the simplest activities feel exhausting and sweat-inducing.

August Average Humidity in Petersburg

This chart illustrates the average monthly humidity levels in Petersburg, with August’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In August, average humidity in Petersburg is approximately 111%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%84%86%88%88%96%110%111%104%96%92%91%
Data source: Humidity data for August generated using information from the Copernicus Climate Change Service.

August UV Index in Petersburg

In Petersburg in August, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Petersburg.

Maximum UV Index Levels in Petersburg for August

The chart shows the monthly maximum UV Index (UVI) for Petersburg in August, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In August, the maximum UV index in Petersburg typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec123566775311
Data source: Petersburg August UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How August Weather in Petersburg Compares to Other Months

Weather in Petersburg varies notably across the year, with each month offering distinct climate conditions. This page compares August’s weather to other months in Petersburg, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Petersburg, showing how August’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (30°F)225 mm (8.9 inches)88%low
February Weather-2°C (29°F)176 mm (6.9 inches)84%low
March Weather1°C (35°F)177 mm (7.0 inches)86%moderate
April Weather5°C (42°F)190 mm (7.5 inches)88%moderate
May Weather10°C (50°F)160 mm (6.3 inches)88%high
June Weather13°C (55°F)206 mm (8.1 inches)96%high
July Weather15°C (59°F)195 mm (7.7 inches)110%high
August Weather15°C (59°F)297 mm (11.7 inches)111%high
September Weather12°C (54°F)288 mm (11.3 inches)104%moderate
October Weather6°C (44°F)276 mm (10.9 inches)96%moderate
November Weather3°C (38°F)309 mm (12.2 inches)92%low
December Weather0°C (33°F)258 mm (10.2 inches)91%low

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