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April Weather in Williamstown, United States

Last updated: June 24, 2025

In Williamstown, United States, the average temperature in April is a cool 7°C (44°F). Visitors can expect a minimum of -9°C (16°F) and a maximum of 26°C (79°F). During this month, the region receives about 136 mm (5.4 in) of precipitation over 14 days, contributing to a notable average humidity level of 84%.

April Temperature in Williamstown

In April in Williamstown, the average temperature is 7°C (44°F). Maximums can reach 26°C (79°F) and minimums can be as low as -9°C (16°F). This variability in temperature makes it essential for travelers to pack layers for their visit.

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 7°C (44°F), with highs reaching up to 26°C (79°F) and lows dropping to around -9°C (16°F).
JanFebMarAprMayJunJulAugSepOctNovDec232632445665706962513628
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 precipitation amount is 136 mm (5.4 in) over a span of 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 136 mm (5.4 inches) of precipitation spread over approximately 14 days.
JanFebMarAprMayJunJulAugSepOctNovDec861059413611090130103105155114115
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 84%. With an average temperature of 7°C (44°F), this humidity feels like a damp chill that seeps into your bones, making it uncomfortable for traveling and requiring extra layers to stay warm and dry.

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.
JanFebMarAprMayJunJulAugSepOctNovDec90%88%86%84%76%72%67%64%72%81%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 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.
JanFebMarAprMayJunJulAugSepOctNovDec34681010997642
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 Weather-5°C (23°F)86 mm (3.4 inches)89%moderate
February Weather-3°C (26°F)105 mm (4.1 inches)88%moderate
March Weather0°C (32°F)94 mm (3.7 inches)86%high
April Weather7°C (44°F)136 mm (5.4 inches)84%very high
May Weather13°C (56°F)110 mm (4.3 inches)76%very high
June Weather18°C (65°F)90 mm (3.5 inches)72%very high
July Weather21°C (71°F)130 mm (5.1 inches)66%very high
August Weather20°C (69°F)103 mm (4.0 inches)64%very high
September Weather17°C (62°F)105 mm (4.1 inches)72%high
October Weather10°C (51°F)155 mm (6.1 inches)81%high
November Weather2°C (37°F)113 mm (4.5 inches)87%moderate
December Weather-2°C (28°F)115 mm (4.5 inches)84%low

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