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May Weather in Watertown, United States

Last updated: June 24, 2025

In Watertown, United States, the average temperature in May is a comfortable 15°C (60°F), with minimums dropping to 1°C (34°F) and maximums soaring to 33°C (92°F). Expect about 110 mm (4.3 in) of precipitation spread over 12 days, contributing to an average humidity of 69%. Get ready for a month that balances warmth with a bit of wetness!

May Temperature in Watertown

In May in Watertown, the average temperature is 15°C (60°F), with maximums reaching up to 33°C (92°F) and minimums dropping as low as 1°C (34°F). This makes it an ideal time for travelers to experience a diverse range of weather conditions, so be sure to pack for both warm and cool temperatures.

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

The chart illustrates May 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, May typically has an average temperature of 15°C (60°F), with highs reaching up to 33°C (92°F) and lows dropping to around 1°C (34°F).
JanFebMarAprMayJunJulAugSepOctNovDec313439495969757467574335
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.

May Precipitation in Watertown

In Watertown in May, the precipitation amount is 110 mm (4.3 in) over a span of 12 days.

May Precipitation Trends in Watertown

The chart displays monthly precipitation patterns in Watertown, with values for each month alongside May’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how May’s conditions compare to those of other months. In Watertown, May typically receives around 110 mm (4.3 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec699392130111991439510513893124
Data source: Precipitation data for May generated using information from the Copernicus Climate Change Service.
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May Humidity in Watertown

In Watertown in May, humidity is 69%. With an average temperature of 15°C (60°F), this humidity feels like a cool, damp embrace that can make outdoor activities feel slightly heavier and more exhausting, but still inviting for exploring the charming sights and sounds of the area.

May Average Humidity in Watertown

This chart illustrates the average monthly humidity levels in Watertown, with May’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In May, average humidity in Watertown is approximately 69%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%82%81%78%70%69%62%65%68%74%82%80%
Data source: Humidity data for May generated using information from the Copernicus Climate Change Service.

May UV Index in Watertown

In Watertown in May, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Watertown.

Maximum UV Index Levels in Watertown for May

The chart shows the monthly maximum UV Index (UVI) for Watertown in May, 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 May, the maximum UV index in Watertown typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356810101098642
Data source: Watertown May 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 May 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 May’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 May’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather0°C (32°F)69 mm (2.7 inches)84%moderate
February Weather1°C (34°F)93 mm (3.7 inches)82%moderate
March Weather4°C (39°F)91 mm (3.6 inches)81%high
April Weather9°C (49°F)130 mm (5.1 inches)78%very high
May Weather15°C (60°F)110 mm (4.3 inches)69%very high
June Weather20°C (69°F)99 mm (3.9 inches)69%very high
July Weather24°C (75°F)143 mm (5.6 inches)62%very high
August Weather23°C (74°F)94 mm (3.7 inches)65%very high
September Weather19°C (67°F)105 mm (4.1 inches)68%very high
October Weather14°C (57°F)138 mm (5.4 inches)74%high
November Weather6°C (44°F)93 mm (3.7 inches)82%moderate
December Weather2°C (36°F)124 mm (4.9 inches)80%low

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