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May Weather in Harrisburg, United States

Last updated: June 24, 2025

In Harrisburg, United States, the average temperature in May hovers around 13°C (56°F). Temperatures can range from a chilly 1°C (33°F) to a warm 30°C (86°F). During this month, expect 64 mm (2.5 in) of precipitation over approximately 8 days, accompanied by an average humidity of 83%. Prepare accordingly to enjoy this diverse climate!

May Temperature in Harrisburg

In May in Harrisburg, the average temperature is 13°C (56°F). The maximum can reach 30°C (86°F), while the minimum can drop as low as 1°C (33°F). Travelers should be prepared for a wide range of temperatures and pack accordingly.

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

The chart illustrates May temperature patterns in Harrisburg, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Harrisburg, May typically has an average temperature of 13°C (56°F), with highs reaching up to 30°C (86°F) and lows dropping to around 1°C (33°F).
JanFebMarAprMayJunJulAugSepOctNovDec414145505662686963534641
Data source: Temperature data for Harrisburg 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 Harrisburg

In Harrisburg in May, the precipitation amount is 64 mm (2.5 in) over the course of 8 days.

May Precipitation Trends in Harrisburg

The chart displays monthly precipitation patterns in Harrisburg, 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 Harrisburg, May typically receives around 64 mm (2.5 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec1601921401256448367191143195
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Harrisburg

In Harrisburg in May humidity is 83%. With an average temperature of 13°C (56°F), this humidity feels like a damp blanket wrapping around you, making travel a bit uncomfortable as the air feels heavy and the moisture clings to your skin.

May Average Humidity in Harrisburg

This chart illustrates the average monthly humidity levels in Harrisburg, 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 Harrisburg is approximately 83%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%84%85%83%83%84%82%74%71%81%87%87%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Harrisburg

In Harrisburg 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 Harrisburg.

Maximum UV Index Levels in Harrisburg for May

The chart shows the monthly maximum UV Index (UVI) for Harrisburg 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 Harrisburg typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec246710101098532
Data source: Harrisburg 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 Harrisburg Compares to Other Months

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

This table compares monthly weather conditions in Harrisburg, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather5°C (42°F)160 mm (6.3 inches)85%low
February Weather5°C (41°F)192 mm (7.5 inches)84%moderate
March Weather7°C (45°F)140 mm (5.5 inches)85%high
April Weather10°C (50°F)125 mm (4.9 inches)83%high
May Weather13°C (56°F)64 mm (2.5 inches)83%very high
June Weather17°C (62°F)48 mm (1.9 inches)83%very high
July Weather20°C (68°F)2 mm (0.1 inches)82%very high
August Weather20°C (69°F)6 mm (0.2 inches)74%very high
September Weather17°C (63°F)71 mm (2.8 inches)71%very high
October Weather11°C (53°F)91 mm (3.6 inches)81%moderate
November Weather8°C (46°F)143 mm (5.6 inches)87%moderate
December Weather5°C (41°F)195 mm (7.7 inches)87%low

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