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May Weather in Watertown, United States

Last updated: June 24, 2025

In May, the average temperature in Watertown, United States hovers around 21°C (70°F), creating a pleasant atmosphere for outdoor activities. However, temperatures can vary significantly, ranging from a chilly 3°C (37°F) to a scorching 34°C (93°F). Expect 123 mm (4.8 in) of precipitation spread over 13 days, contributing to an average humidity level of 83%.

May Temperature in Watertown

In May in Watertown, the average temperature is 21°C (70°F). Maximum temperatures can reach 34°C (93°F), while minimums can drop to as low as 3°C (37°F). Be prepared for a variety of weather conditions when traveling during this time.

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 21°C (70°F), with highs reaching up to 34°C (93°F) and lows dropping to around 3°C (37°F).
JanFebMarAprMayJunJulAugSepOctNovDec414653597076807874634946
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 123 mm (4.8 in) over the course of 13 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 123 mm (4.8 inches) of precipitation spread over approximately 13 days.
JanFebMarAprMayJunJulAugSepOctNovDec10919017615112314913112413014081152
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 83%. With an average temperature of 21°C (70°F), this humidity feels like you’re enveloped in a warm, tropical embrace, making it essential to stay hydrated and take breaks during your travels.

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 83%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%87%85%82%83%82%78%67%64%75%87%89%
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.
JanFebMarAprMayJunJulAugSepOctNovDec36710101111109753
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 Weather5°C (41°F)109 mm (4.3 inches)87%moderate
February Weather8°C (46°F)190 mm (7.5 inches)87%high
March Weather12°C (53°F)176 mm (6.9 inches)85%high
April Weather15°C (60°F)151 mm (5.9 inches)82%very high
May Weather21°C (70°F)123 mm (4.8 inches)83%very high
June Weather25°C (76°F)149 mm (5.9 inches)82%extreme
July Weather26°C (80°F)131 mm (5.1 inches)78%extreme
August Weather25°C (78°F)124 mm (4.9 inches)67%very high
September Weather23°C (74°F)130 mm (5.1 inches)64%very high
October Weather17°C (64°F)140 mm (5.5 inches)74%high
November Weather9°C (49°F)81 mm (3.2 inches)87%moderate
December Weather8°C (46°F)151 mm (6.0 inches)88%moderate

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