April Weather in Watertown, United States

Last updated: June 24, 2025

In Watertown, United States, the average temperature in April is a pleasant 21°C (70°F). Expect a range of temperatures, with minimums dipping to 3°C (38°F) and maximums rising to 34°C (94°F). This month, you can anticipate 75 mm (3.0 in) of precipitation spread over 8 days, contributing to an average humidity of 76%.

April Temperature in Watertown

In April in Watertown, the average temperature is 21°C (70°F). Maximums can reach 34°C (94°F) and minimums can be as low as 3°C (38°F). Be sure to pack accordingly, as the weather can vary dramatically throughout the day.

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 21°C (70°F), with highs reaching up to 34°C (94°F) and lows dropping to around 3°C (38°F).

Data source: Temperature data for Watertown generated using information from the Copernicus Climate Change Service.

April Precipitation in Watertown

In Watertown in April, the total precipitation amount is 75 mm (3.0 in) over the course of 8 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 75 mm (3.0 inches) of precipitation spread over approximately 8 days.

Data source: Precipitation data for April generated using information from the Copernicus Climate Change Service.

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

April Humidity in Watertown

In Watertown in April, humidity is 76%. With an average temperature of 21°C (70°F), this humidity feels like a warm, muggy embrace that can make outdoor activities feel more strenuous, prompting travelers to take frequent breaks and seek shade to stay comfortable during their adventures.

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 76%, offering insight into how humid the weather typically is during this month.

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 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 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 10, which falls under the very high exposure category.

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.
	Temperature	Precipitation	Humidity	UV
January Weather	13°C (55°F)	54 mm (2.1 inches)	85%	moderate
February Weather	16°C (61°F)	73 mm (2.9 inches)	82%	high
March Weather	18°C (65°F)	36 mm (1.4 inches)	80%	very high
April Weather	21°C (70°F)	75 mm (3.0 inches)	76%	very high
May Weather	24°C (76°F)	76 mm (3.0 inches)	73%	extreme
June Weather	26°C (80°F)	158 mm (6.2 inches)	74%	extreme
July Weather	27°C (81°F)	175 mm (6.9 inches)	80%	extreme
August Weather	27°C (81°F)	184 mm (7.2 inches)	79%	extreme
September Weather	26°C (80°F)	140 mm (5.5 inches)	83%	very high
October Weather	23°C (74°F)	65 mm (2.6 inches)	77%	very high
November Weather	17°C (62°F)	64 mm (2.5 inches)	84%	high
December Weather	14°C (58°F)	103 mm (4.1 inches)	88%	moderate