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April Weather in Watertown, United States

Last updated: June 24, 2025

In April, the average temperature in Watertown, United States hovers around 7°C (46°F). Be prepared for a range of weather, as temperatures can dip as low as -9°C (16°F) and soar up to 27°C (81°F). With 103 mm (4.1 in) of precipitation spread over 12 days, expect some wet weather. The average humidity remains high at 85%, making it a rather damp time of year.

April Temperature in Watertown

In April in Watertown, the average temperature is 7°C (46°F), with maximums reaching up to 27°C (81°F) and minimums dipping as low as -9°C (16°F). This diverse range of temperatures makes it essential for travelers to pack layers to stay comfortable during their visit.

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

The chart illustrates April temperature patterns in Watertown, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Watertown, April typically has an average temperature of 7°C (46°F), with highs reaching up to 27°C (81°F) and lows dropping to around -9°C (16°F).
JanFebMarAprMayJunJulAugSepOctNovDec212335455970747165513629
Data source: Temperature data for Watertown 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 Watertown

In Watertown in April, the total precipitation amount is 103 mm (4.1 in), occurring over the course of 12 days.

April Precipitation Trends in Watertown

The chart displays monthly precipitation patterns in Watertown, 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 Watertown, April typically receives around 103 mm (4.1 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec51495710312111310294991144345
Data source: Precipitation data for April generated using information from the Copernicus Climate Change Service.
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April Humidity in Watertown

In Watertown in April humidity is 85%. With an average temperature of 7°C (46°F), this humidity feels like a damp chill that seeps into your bones, making outdoor exploration feel much colder than it actually is.

April Average Humidity in Watertown

This chart illustrates the average monthly humidity levels in Watertown, 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 Watertown is approximately 85%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%85%85%85%78%80%78%76%79%83%88%82%
Data source: Humidity data for April generated using information from the Copernicus Climate Change Service.

April UV Index in Watertown

In Watertown 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 Watertown.

Maximum UV Index Levels in Watertown for April

The chart shows the monthly maximum UV Index (UVI) for Watertown 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 Watertown typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec34589101098532
Data source: Watertown 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 Watertown Compares to Other Months

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

This table compares monthly weather conditions in Watertown, showing how April’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-6°C (22°F)51 mm (2.0 inches)85%moderate
February Weather-5°C (23°F)49 mm (1.9 inches)85%moderate
March Weather2°C (36°F)57 mm (2.3 inches)85%moderate
April Weather7°C (46°F)103 mm (4.1 inches)85%very high
May Weather15°C (59°F)121 mm (4.8 inches)78%very high
June Weather21°C (70°F)113 mm (4.5 inches)80%very high
July Weather23°C (74°F)102 mm (4.0 inches)78%very high
August Weather22°C (71°F)94 mm (3.7 inches)76%very high
September Weather18°C (65°F)99 mm (3.9 inches)79%very high
October Weather11°C (51°F)114 mm (4.5 inches)83%moderate
November Weather2°C (37°F)43 mm (1.7 inches)88%moderate
December Weather-2°C (30°F)45 mm (1.8 inches)81%low

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