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May Weather in Chambersburg, United States

Last updated: June 24, 2025

In Chambersburg, United States, the average temperature in May is a pleasant 17°C (63°F). However, temperatures can vary widely, with a minimum of -1°C (31°F) and a maximum reaching 32°C (90°F). Expect about 117 mm (4.6 in) of precipitation over approximately 14 days, and be prepared for a relatively high average humidity of 78%.

May Temperature in Chambersburg

In May in Chambersburg, the average temperature is 17°C (63°F), with maximums reaching up to 32°C (90°F) and minimums dropping as low as -1°C (31°F). It's essential to pack layers and be prepared for varying weather conditions while enjoying your travels.

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

The chart illustrates May temperature patterns in Chambersburg, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Chambersburg, May typically has an average temperature of 17°C (63°F), with highs reaching up to 32°C (90°F) and lows dropping to around -1°C (31°F).
JanFebMarAprMayJunJulAugSepOctNovDec323642526371777468584336
Data source: Temperature data for Chambersburg 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 Chambersburg

In Chambersburg in May, the precipitation amount is 117 mm (4.6 in) spread over 14 days.

May Precipitation Trends in Chambersburg

The chart displays monthly precipitation patterns in Chambersburg, 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 Chambersburg, May typically receives around 117 mm (4.6 inches) of precipitation spread over approximately 14 days.
JanFebMarAprMayJunJulAugSepOctNovDec62999010611792128931251088293
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Chambersburg

In Chambersburg in May, humidity is 78%. With an average temperature of 17°C (63°F), this humidity feels like a warm, enveloping blanket, making traveling slightly uncomfortable as you navigate the sticky air, prompting the need for frequent breaks in cooler, shaded areas.

May Average Humidity in Chambersburg

This chart illustrates the average monthly humidity levels in Chambersburg, 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 Chambersburg 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 Chambersburg

In Chambersburg 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 Chambersburg.

Maximum UV Index Levels in Chambersburg for May

The chart shows the monthly maximum UV Index (UVI) for Chambersburg 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 Chambersburg typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec357910101098642
Data source: Chambersburg 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 Chambersburg Compares to Other Months

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

This table compares monthly weather conditions in Chambersburg, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather0°C (32°F)61 mm (2.4 inches)86%moderate
February Weather2°C (36°F)99 mm (3.9 inches)86%moderate
March Weather5°C (42°F)90 mm (3.5 inches)86%high
April Weather11°C (53°F)106 mm (4.2 inches)84%very high
May Weather17°C (63°F)117 mm (4.6 inches)78%very high
June Weather22°C (71°F)92 mm (3.6 inches)79%very high
July Weather25°C (77°F)128 mm (5.0 inches)70%very high
August Weather24°C (75°F)93 mm (3.7 inches)59%very high
September Weather20°C (68°F)124 mm (4.9 inches)68%very high
October Weather14°C (58°F)108 mm (4.3 inches)80%high
November Weather6°C (43°F)82 mm (3.2 inches)86%moderate
December Weather2°C (37°F)93 mm (3.7 inches)85%low

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