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April Weather in Williamstown, United States

Last updated: June 24, 2025

In Williamstown, United States, the average temperature in April hovers around 11°C (52°F), with a range from a chilly -3°C (26°F) to a warm 29°C (85°F). During this time, you can expect about 110 mm (4.4 in) of precipitation spread over 12 days, leading to an average humidity of 83%. Be prepared for a mix of cool and warm conditions!

April Temperature in Williamstown

In April in Williamstown, the average temperature is 11°C (52°F). Maximum temperatures can reach 29°C (85°F), while minimums can drop as low as -3°C (26°F). It's advisable to pack a range of clothing to accommodate both warm and cold conditions during your travels.

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 11°C (52°F), with highs reaching up to 29°C (85°F) and lows dropping to around -3°C (26°F).
JanFebMarAprMayJunJulAugSepOctNovDec323541526271767468584336
Data source: Temperature data for Williamstown 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 Williamstown

In Williamstown, in April, the total precipitation amount is 110 mm (4.4 in) over the course of 12 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 110 mm (4.4 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec74107981111271061521401151149895
Data source: Precipitation data for April generated using information from the Copernicus Climate Change Service.
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April Humidity in Williamstown

In Williamstown in April humidity is 83%. With an average temperature of 11°C (52°F), this humidity feels like a damp chill that can make outdoor activities uncomfortable, often leading travelers to seek shelter indoors or to dress in layered clothing to stay warm while exploring the area.

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 83%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%85%85%83%75%74%65%62%66%79%87%85%
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 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 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 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356910101098642
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.
 TemperaturePrecipitationHumidityUV
January Weather0°C (32°F)74 mm (2.9 inches)87%moderate
February Weather1°C (35°F)107 mm (4.2 inches)85%moderate
March Weather5°C (41°F)98 mm (3.8 inches)85%high
April Weather11°C (52°F)110 mm (4.4 inches)83%very high
May Weather17°C (62°F)127 mm (5.0 inches)75%very high
June Weather21°C (71°F)106 mm (4.2 inches)73%very high
July Weather25°C (76°F)152 mm (6.0 inches)65%very high
August Weather23°C (74°F)140 mm (5.5 inches)62%very high
September Weather20°C (68°F)115 mm (4.5 inches)66%very high
October Weather14°C (58°F)114 mm (4.5 inches)79%high
November Weather6°C (43°F)98 mm (3.9 inches)87%moderate
December Weather2°C (36°F)94 mm (3.7 inches)85%low

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