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May Weather in Harrisburg, United States

Last updated: June 24, 2025

In Harrisburg, United States, the average temperature in May is a pleasant 22°C (71°F). However, you can expect a temperature range with a minimum of 5°C (41°F) and a maximum reaching 36°C (96°F). During this month, precipitation averages 113 mm (4.5 in) across approximately 11 days, contributing to an average humidity of 83%. Prepare for a warm and somewhat humid experience!

May Temperature in Harrisburg

In May in Harrisburg, the average temperature is 22°C (71°F). The maximum can reach 36°C (96°F), and the minimum can be as low as 5°C (41°F). This makes it a great time for travelers to experience pleasant weather while being prepared for both warmth and cooler evenings.

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 22°C (71°F), with highs reaching up to 36°C (96°F) and lows dropping to around 5°C (41°F).
JanFebMarAprMayJunJulAugSepOctNovDec434954627177817974655147
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 total precipitation amount is 113 mm (4.5 in), spread over a period of 11 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 113 mm (4.5 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec9211683103113821141051339290120
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 22°C (71°F), this humidity feels like a warm blanket wrapping around you, making travel a bit sticky but still enjoyable, as long as you stay hydrated and take breaks in the shade.

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.
JanFebMarAprMayJunJulAugSepOctNovDec86%85%84%82%83%82%80%74%75%79%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.
JanFebMarAprMayJunJulAugSepOctNovDec46810101110109853
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 Weather6°C (44°F)92 mm (3.6 inches)86%moderate
February Weather9°C (49°F)116 mm (4.6 inches)85%high
March Weather12°C (54°F)83 mm (3.3 inches)84%very high
April Weather17°C (62°F)103 mm (4.0 inches)82%very high
May Weather22°C (71°F)113 mm (4.5 inches)83%very high
June Weather25°C (77°F)82 mm (3.2 inches)82%extreme
July Weather27°C (81°F)114 mm (4.5 inches)80%very high
August Weather26°C (79°F)105 mm (4.1 inches)74%very high
September Weather23°C (75°F)133 mm (5.2 inches)75%very high
October Weather18°C (65°F)92 mm (3.6 inches)79%very high
November Weather10°C (51°F)90 mm (3.5 inches)87%moderate
December Weather8°C (47°F)120 mm (4.7 inches)87%moderate

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