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April Weather in Williamstown, United States

Last updated: June 24, 2025

In April, the average temperature in Williamstown, United States hovers around 13°C (55°F), with a minimum of -3°C (27°F) and a maximum reaching 29°C (85°F). Expect some rain, as precipitation totals around 135 mm (5.3 in) over 12 days. With an average humidity of 85%, be prepared for a moist atmosphere throughout the month!

April Temperature in Williamstown

In April in Williamstown, the average temperature is 13°C (55°F), with maximums reaching 29°C (85°F) and minimums dropping as low as -3°C (27°F). This diverse temperature range makes it an ideal time for travelers to experience both mild and invigorating weather.

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 13°C (55°F), with highs reaching up to 29°C (85°F) and lows dropping to around -3°C (27°F).
JanFebMarAprMayJunJulAugSepOctNovDec343846556673777570594439
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 135 mm (5.3 in), occurring 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 135 mm (5.3 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec821231331351311681198810710491116
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 85%. With an average temperature of 13°C (55°F), this humidity feels like a heavy blanket wrapping around you, making even short walks feel exhausting and urging travelers to seek shade and refreshment frequently.

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 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 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.
JanFebMarAprMayJunJulAugSepOctNovDec357910101098643
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 Weather1°C (35°F)82 mm (3.2 inches)88%moderate
February Weather4°C (39°F)122 mm (4.8 inches)88%moderate
March Weather8°C (46°F)133 mm (5.2 inches)87%high
April Weather13°C (55°F)135 mm (5.3 inches)85%very high
May Weather19°C (66°F)131 mm (5.2 inches)81%very high
June Weather23°C (73°F)167 mm (6.6 inches)82%very high
July Weather25°C (77°F)119 mm (4.7 inches)81%very high
August Weather24°C (75°F)88 mm (3.5 inches)73%very high
September Weather21°C (71°F)107 mm (4.2 inches)73%very high
October Weather15°C (60°F)104 mm (4.1 inches)78%high
November Weather7°C (45°F)91 mm (3.6 inches)89%moderate
December Weather4°C (40°F)116 mm (4.6 inches)87%moderate

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