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May Weather in Petersburg, United States

Last updated: June 24, 2025

In Petersburg, United States, the average temperature in May hovers around 16°C (62°F), with fluctuations that can see minimums dip to -2°C (29°F) and soar up to 31°C (88°F). Expect 124 mm (4.9 in) of precipitation spread over 14 days, contributing to an average humidity of 78%. Prepare for a mix of weather as you embrace the unique climate of this region!

May Temperature in Petersburg

In May in Petersburg, the average temperature is 16°C (62°F). The maximum can reach 31°C (88°F), and the minimum can be as low as -2°C (29°F). This makes it advisable for travelers to pack for both warm and chilly conditions while exploring.

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 16°C (62°F), with highs reaching up to 31°C (88°F) and lows dropping to around -2°C (29°F).
JanFebMarAprMayJunJulAugSepOctNovDec323742526269747266574237
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 124 mm (4.9 in) over a span of 14 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 124 mm (4.9 inches) of precipitation spread over approximately 14 days.
JanFebMarAprMayJunJulAugSepOctNovDec62947710312410189951081066487
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 78%. With an average temperature of 16°C (62°F), this humidity feels like a warm blanket wrapping around you, making outdoor activities enjoyable yet slightly sticky. Travelers may find the weather pleasantly mild, though they'll appreciate having light, breathable clothing on hand to stay comfortable while exploring.

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 78%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%86%86%84%78%79%70%59%68%80%87%85%
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.
JanFebMarAprMayJunJulAugSepOctNovDec35710101010108753
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 Weather0°C (33°F)62 mm (2.4 inches)86%moderate
February Weather3°C (38°F)94 mm (3.7 inches)86%moderate
March Weather6°C (43°F)77 mm (3.0 inches)86%high
April Weather11°C (52°F)103 mm (4.0 inches)84%very high
May Weather16°C (62°F)124 mm (4.9 inches)78%very high
June Weather21°C (69°F)100 mm (4.0 inches)79%very high
July Weather24°C (75°F)89 mm (3.5 inches)70%very high
August Weather22°C (72°F)95 mm (3.8 inches)59%very high
September Weather19°C (67°F)108 mm (4.2 inches)68%very high
October Weather14°C (57°F)106 mm (4.2 inches)80%high
November Weather6°C (42°F)64 mm (2.5 inches)86%moderate
December Weather3°C (37°F)87 mm (3.4 inches)85%moderate

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