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April Weather in Petersburg, United States

Last updated: June 24, 2025

In April, the average temperature in Petersburg, United States hovers around 9°C (48°F). While it can dip to a chilly -7°C (21°F), you might also experience warmer spells peaking at 28°C (83°F). Prepare for some wet days, as 89 mm (3.5 in) of precipitation can be expected over 13 days, with humidity levels averaging a high 87%.

April Temperature in Petersburg

In April in Petersburg, the average temperature is 9°C (48°F), with maximums reaching 28°C (83°F) and minimums dropping as low as -7°C (21°F). Be prepared for a wide range of temperatures while traveling, so layering your clothing would be a smart choice.

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

The chart illustrates April 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, April typically has an average temperature of 9°C (48°F), with highs reaching up to 28°C (83°F) and lows dropping to around -7°C (21°F).
JanFebMarAprMayJunJulAugSepOctNovDec272838486071757367554033
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.

April Precipitation in Petersburg

In Petersburg in April, the precipitation amount is 89 mm (3.5 in) distributed over 13 days.

April Precipitation Trends in Petersburg

The chart displays monthly precipitation patterns in Petersburg, with values for each month alongside April’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how April’s conditions compare to those of other months. In Petersburg, April typically receives around 89 mm (3.5 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec65677789126861057359998254
Data source: Precipitation data for April generated using information from the Copernicus Climate Change Service.
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April Humidity in Petersburg

In Petersburg in April humidity is 87%. With an average temperature of 9°C (48°F), this humidity feels like a damp chill that seeps into your bones, making outdoor exploration uncomfortable and requiring extra layers and careful planning for any activities.

April Average Humidity in Petersburg

This chart illustrates the average monthly humidity levels in Petersburg, with April’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In April, average humidity in Petersburg is approximately 87%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%87%87%88%81%82%81%78%78%82%89%86%
Data source: Humidity data for April generated using information from the Copernicus Climate Change Service.

April UV Index in Petersburg

In Petersburg in April, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Petersburg.

Maximum UV Index Levels in Petersburg for April

The chart shows the monthly maximum UV Index (UVI) for Petersburg in April, 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 April, the maximum UV index in Petersburg typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec25599101098642
Data source: Petersburg April 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 April 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 April’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 April’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-3°C (28°F)65 mm (2.6 inches)88%low
February Weather-2°C (29°F)67 mm (2.6 inches)87%moderate
March Weather3°C (38°F)77 mm (3.0 inches)87%moderate
April Weather9°C (48°F)89 mm (3.5 inches)87%very high
May Weather16°C (60°F)126 mm (5.0 inches)81%very high
June Weather21°C (71°F)86 mm (3.4 inches)82%very high
July Weather24°C (75°F)105 mm (4.1 inches)81%very high
August Weather23°C (73°F)73 mm (2.9 inches)78%very high
September Weather19°C (67°F)59 mm (2.3 inches)78%very high
October Weather13°C (55°F)99 mm (3.9 inches)82%high
November Weather4°C (40°F)82 mm (3.2 inches)89%moderate
December Weather1°C (33°F)54 mm (2.1 inches)86%low

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