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May Weather in Petersburg, United States

Last updated: June 24, 2025

In May, the average temperature in Petersburg, United States hovers around 21°C (71°F), though it can dip as low as 3°C (38°F) and soar to a steamy high of 34°C (93°F). Expect about 110 mm (4.3 in) of precipitation spread over 12 days, with an average humidity of 83%, creating a lush and vibrant atmosphere.

May Temperature in Petersburg

In May in Petersburg, the average temperature is 21°C (71°F), with maximums reaching up to 34°C (93°F) and minimums dropping as low as 3°C (38°F). This diverse temperature range makes Petersburg an ideal destination for travelers seeking both warm and cool experiences.

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

The chart illustrates May 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, May typically has an average temperature of 21°C (71°F), with highs reaching up to 34°C (93°F) and lows dropping to around 3°C (38°F).
JanFebMarAprMayJunJulAugSepOctNovDec424754607077807874644946
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.

May Precipitation in Petersburg

In Petersburg in May, the precipitation amount is 110 mm (4.3 in) over a span of 12 days.

May Precipitation Trends in Petersburg

The chart displays monthly precipitation patterns in Petersburg, with values for each month alongside May’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how May’s conditions compare to those of other months. In Petersburg, May typically receives around 110 mm (4.3 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec11418218515211013414211510911471144
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Petersburg

In Petersburg in May humidity is 83%. With an average temperature of 21°C (71°F), this humidity feels like walking through a warm mist, making travel both refreshing and slightly uncomfortable as the air clings to your skin and you find yourself needing to take frequent breaks to hydrate.

May Average Humidity in Petersburg

This chart illustrates the average monthly humidity levels in Petersburg, with May’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In May, average humidity in Petersburg is approximately 83%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%87%85%82%83%82%78%67%64%75%87%89%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Petersburg

In Petersburg in May, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Petersburg.

Maximum UV Index Levels in Petersburg for May

The chart shows the monthly maximum UV Index (UVI) for Petersburg in May, 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 May, the maximum UV index in Petersburg typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec46810101111109753
Data source: Petersburg May 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 May 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 May’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 May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather6°C (42°F)114 mm (4.5 inches)87%moderate
February Weather8°C (47°F)182 mm (7.2 inches)87%high
March Weather12°C (54°F)185 mm (7.3 inches)85%very high
April Weather16°C (60°F)152 mm (6.0 inches)82%very high
May Weather21°C (71°F)110 mm (4.3 inches)83%very high
June Weather25°C (77°F)134 mm (5.3 inches)82%extreme
July Weather26°C (80°F)142 mm (5.6 inches)78%extreme
August Weather26°C (79°F)115 mm (4.5 inches)67%very high
September Weather23°C (75°F)109 mm (4.3 inches)64%very high
October Weather18°C (64°F)114 mm (4.5 inches)74%high
November Weather10°C (50°F)71 mm (2.8 inches)87%moderate
December Weather8°C (47°F)144 mm (5.7 inches)88%moderate

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