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April Weather in Williamsport, United States

Last updated: June 24, 2025

In April, the average temperature in Williamsport, United States hovers around 12°C (53°F). Temperatures can dip as low as -5°C (23°F) but can also soar to 29°C (85°F). Be prepared for some rain, as the area experiences an average precipitation of 126 mm (5.0 in) over 13 days. Coupled with an average humidity of 85%, it’s wise to plan accordingly for both warm and wet conditions!

April Temperature in Williamsport

In April, in Williamsport, the average temperature is 12°C (53°F). The maximum can reach 29°C (85°F) and the minimum can be as low as -5°C (23°F). Be prepared for a range of temperatures if you're planning to travel during this month.

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

The chart illustrates April 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, April typically has an average temperature of 12°C (53°F), with highs reaching up to 29°C (85°F) and lows dropping to around -5°C (23°F).
JanFebMarAprMayJunJulAugSepOctNovDec323644536572777470594338
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.

April Precipitation in Williamsport

In Williamsport in April, the precipitation amount is 126 mm (5.0 in) over the course of 13 days.

April Precipitation Trends in Williamsport

The chart displays monthly precipitation patterns in Williamsport, 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 Williamsport, April typically receives around 126 mm (5.0 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec81110123126127130109919110296104
Data source: Precipitation data for April generated using information from the Copernicus Climate Change Service.
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April Humidity in Williamsport

In Williamsport in April, humidity is 85%. With an average temperature of 12°C (53°F), this humidity feels like a damp embrace, making travel somewhat uncomfortable as you navigate the thick, moist air that clings to your skin.

April Average Humidity in Williamsport

This chart illustrates the average monthly humidity levels in Williamsport, 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 Williamsport is approximately 85%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%88%87%85%81%82%81%73%73%78%89%87%
Data source: Humidity data for April generated using information from the Copernicus Climate Change Service.

April UV Index in Williamsport

In Williamsport 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 Williamsport.

Maximum UV Index Levels in Williamsport for April

The chart shows the monthly maximum UV Index (UVI) for Williamsport 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 Williamsport typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356910101098643
Data source: Williamsport 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 Williamsport Compares to Other Months

Weather in Williamsport varies notably across the year, with each month offering distinct climate conditions. This page compares April’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 April’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather0°C (33°F)81 mm (3.2 inches)88%moderate
February Weather2°C (37°F)109 mm (4.3 inches)88%moderate
March Weather7°C (44°F)123 mm (4.8 inches)87%high
April Weather12°C (53°F)126 mm (5.0 inches)85%very high
May Weather18°C (65°F)127 mm (5.0 inches)81%very high
June Weather22°C (73°F)130 mm (5.1 inches)82%very high
July Weather25°C (77°F)109 mm (4.3 inches)81%very high
August Weather24°C (75°F)91 mm (3.6 inches)73%very high
September Weather21°C (70°F)91 mm (3.6 inches)73%very high
October Weather15°C (59°F)102 mm (4.0 inches)78%high
November Weather6°C (43°F)96 mm (3.8 inches)89%moderate
December Weather3°C (38°F)104 mm (4.1 inches)87%moderate

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