April Weather in Williamstown, United States

Last updated: June 24, 2025

In April, the average temperature in Williamstown, United States hovers around 5°C (42°F). Expect a wide range of conditions, with minimum temperatures dipping to -9°C (17°F) and maximums reaching up to 25°C (78°F). This month also brings 117 mm (4.6 in) of precipitation over approximately 14 days, contributing to an average humidity level of 84%. Stay prepared for a mix of chilly days and warmer spells!

April Temperature in Williamstown

In April in Williamstown, the average temperature is 5°C (42°F). Maximums can reach 25°C (78°F), and minimums can be as low as -9°C (17°F). Be prepared for a wide range of temperatures during your travels, packing layers to ensure comfort in both warm and chilly conditions.

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

The chart illustrates April temperature patterns in Williamstown, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Williamstown, April typically has an average temperature of 5°C (42°F), with highs reaching up to 25°C (78°F) and lows dropping to around -9°C (17°F).

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

April Precipitation in Williamstown

In Williamstown in April, the precipitation amount is 117 mm (4.6 in) spread over 14 days.

April Precipitation Trends in Williamstown

The chart displays monthly precipitation patterns in Williamstown, 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 Williamstown, April typically receives around 117 mm (4.6 inches) of precipitation spread over approximately 14 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

April Humidity in Williamstown

In Williamstown in April, humidity is 84%. With an average temperature of 5°C (42°F), this humidity feels like a thick blanket wrapping around you, making every step feel heavier while traveling.

April Average Humidity in Williamstown

This chart illustrates the average monthly humidity levels in Williamstown, 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 Williamstown is approximately 84%, 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 Williamstown

In Williamstown in April, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Williamstown.

Maximum UV Index Levels in Williamstown for April

The chart shows the monthly maximum UV Index (UVI) for Williamstown 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 Williamstown typically reaches 8, which falls under the very high exposure category.

Data source: Williamstown 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 Williamstown Compares to Other Months

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

This table compares monthly weather conditions in Williamstown, showing how April’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-7°C (19°F)	77 mm (3.0 inches)	89%	low
February Weather	-6°C (22°F)	80 mm (3.2 inches)	88%	moderate
March Weather	-2°C (29°F)	71 mm (2.8 inches)	86%	moderate
April Weather	5°C (42°F)	117 mm (4.6 inches)	84%	very high
May Weather	12°C (55°F)	96 mm (3.8 inches)	76%	very high
June Weather	17°C (64°F)	97 mm (3.8 inches)	72%	very high
July Weather	20°C (69°F)	140 mm (5.5 inches)	66%	very high
August Weather	19°C (67°F)	98 mm (3.9 inches)	64%	very high
September Weather	15°C (60°F)	71 mm (2.8 inches)	72%	high
October Weather	9°C (48°F)	141 mm (5.6 inches)	81%	moderate
November Weather	1°C (33°F)	104 mm (4.1 inches)	87%	moderate
December Weather	-5°C (24°F)	88 mm (3.4 inches)	84%	low