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May Weather in Williamsport, United States

Last updated: June 24, 2025

In May, the average temperature in Williamsport, United States is a pleasant 18°C (65°F). However, be prepared for a range: temperatures can dip to a chilly 1°C (34°F) or soar as high as 33°C (92°F). You'll likely encounter some rain, with an average precipitation amount of 132 mm (5.2 in) spread over 14 days, and the average humidity sits at a cozy 78%.

May Temperature in Williamsport

In May in Williamsport, the average temperature is 18°C (65°F), with maximums reaching 33°C (92°F) and minimums dropping as low as 1°C (34°F). It's a great time to visit Williamsport, offering a pleasant climate for outdoor activities and exploration.

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

The chart illustrates May temperature patterns in Williamsport, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Williamsport, May typically has an average temperature of 18°C (65°F), with highs reaching up to 33°C (92°F) and lows dropping to around 1°C (34°F).
JanFebMarAprMayJunJulAugSepOctNovDec353945556573797670604539
Data source: Temperature data for Williamsport 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 Williamsport

In Williamsport in May, the precipitation amount is 132 mm (5.2 in) over a span of 14 days.

May Precipitation Trends in Williamsport

The chart displays monthly precipitation patterns in Williamsport, 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 Williamsport, May typically receives around 132 mm (5.2 inches) of precipitation spread over approximately 14 days.
JanFebMarAprMayJunJulAugSepOctNovDec619488104132100127981051008494
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Williamsport

In Williamsport in May, humidity is 78%. With an average temperature of 18°C (65°F), this humidity feels like a warm, enveloping blanket, making travel quite muggy and potentially uncomfortable, as it can leave you feeling sticky and fatigued more quickly than usual.

May Average Humidity in Williamsport

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

In Williamsport 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 Williamsport.

Maximum UV Index Levels in Williamsport for May

The chart shows the monthly maximum UV Index (UVI) for Williamsport 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 Williamsport typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec357910101098743
Data source: Williamsport 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 Williamsport Compares to Other Months

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

This table compares monthly weather conditions in Williamsport, showing how May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather2°C (35°F)61 mm (2.4 inches)86%moderate
February Weather4°C (39°F)94 mm (3.7 inches)86%moderate
March Weather7°C (45°F)88 mm (3.5 inches)86%high
April Weather13°C (55°F)104 mm (4.1 inches)84%very high
May Weather18°C (65°F)132 mm (5.2 inches)78%very high
June Weather23°C (74°F)100 mm (3.9 inches)79%very high
July Weather26°C (79°F)127 mm (5.0 inches)70%very high
August Weather25°C (77°F)98 mm (3.9 inches)59%very high
September Weather21°C (71°F)105 mm (4.1 inches)68%very high
October Weather16°C (60°F)100 mm (3.9 inches)80%high
November Weather7°C (45°F)84 mm (3.3 inches)86%moderate
December Weather4°C (39°F)94 mm (3.7 inches)85%moderate

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