April Weather in Williamsport, United States

Last updated: June 24, 2025

In April, the average temperature in Williamsport, United States hovers around 11°C (52°F). Expect a chilly minimum of -6°C (21°F), while days can warm up to a balmy 29°C (84°F). Be prepared for 104 mm (4.1 in) of precipitation spread over 11 days, and brace yourself for an average humidity level of 87%, creating a rather damp atmosphere.

April Temperature in Williamsport

In April in Williamsport, the average temperature is 11°C (52°F). Maximums can reach 29°C (84°F), and minimums can drop as low as -6°C (21°F). Be prepared for a wide range of temperatures during your travels, making layers essential for comfort.

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 11°C (52°F), with highs reaching up to 29°C (84°F) and lows dropping to around -6°C (21°F).

Data source: Temperature data for Williamsport generated using information from the Copernicus Climate Change Service.

April Precipitation in Williamsport

In Williamsport in April, the precipitation amount is 104 mm (4.1 in) over the course of 11 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 104 mm (4.1 inches) of precipitation spread over approximately 11 days.

Data source: Precipitation data for April generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

April Humidity in Williamsport

In Williamsport in April, humidity is 87%. With an average temperature of 11°C (52°F), this humidity feels like a damp chill that can make your clothes cling uncomfortably, leaving you feeling slightly weighed down while exploring the area.

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 87%, offering insight into how humid the weather typically is during this month.

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.

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.
	Temperature	Precipitation	Humidity	UV
January Weather	-2°C (29°F)	76 mm (3.0 inches)	85%	moderate
February Weather	0°C (32°F)	77 mm (3.1 inches)	85%	moderate
March Weather	6°C (42°F)	112 mm (4.4 inches)	86%	high
April Weather	11°C (52°F)	104 mm (4.1 inches)	87%	very high
May Weather	18°C (64°F)	151 mm (5.9 inches)	81%	very high
June Weather	23°C (74°F)	103 mm (4.0 inches)	82%	extreme
July Weather	25°C (77°F)	93 mm (3.7 inches)	81%	very high
August Weather	23°C (74°F)	106 mm (4.2 inches)	79%	very high
September Weather	21°C (70°F)	67 mm (2.6 inches)	78%	very high
October Weather	14°C (58°F)	116 mm (4.6 inches)	81%	high
November Weather	5°C (42°F)	76 mm (3.0 inches)	89%	moderate
December Weather	2°C (36°F)	61 mm (2.4 inches)	86%	low