January Weather in Watertown, United States

Last updated: June 24, 2025

In January, the average temperature in Watertown, United States hovers around 5°C (41°F). Expect a range from a chilly -14°C (7°F) at the lowest to a mild 24°C (75°F) at the highest. The month brings 109 mm (4.3 in) of precipitation over 11 days, contributing to a rather humid atmosphere with an average humidity of 87%.

January Temperature in Watertown

In January in Watertown, the average temperature is 5°C (41°F). Maximums can reach 24°C (75°F) and minimums can be as low as -14°C (7°F). Be prepared for a wide range of temperatures, making it essential to pack layers for your travels.

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

The chart illustrates January 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, January typically has an average temperature of 5°C (41°F), with highs reaching up to 24°C (75°F) and lows dropping to around -14°C (7°F).

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

January Precipitation in Watertown

In Watertown in January, the precipitation amount is 109 mm (4.3 in), occurring over a span of 11 days.

January Precipitation Trends in Watertown

The chart displays monthly precipitation patterns in Watertown, with values for each month alongside January’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how January’s conditions compare to those of other months. In Watertown, January typically receives around 109 mm (4.3 inches) of precipitation spread over approximately 11 days.

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

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Millimeters (mm) Inches (in)

January Humidity in Watertown

In Watertown in January humidity is 87%. With an average temperature of 5°C (41°F), this humidity feels like a heavy, damp blanket enveloping you, making every step seem laborious and the chill more biting, which can be quite challenging for traveling.

January Average Humidity in Watertown

This chart illustrates the average monthly humidity levels in Watertown, with January’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In January, average humidity in Watertown is approximately 87%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for January generated using information from the Copernicus Climate Change Service.

January UV Index in Watertown

In Watertown in January, the maximum UV index is 3, which corresponds to a moderate Exposure Category. The time to burn is approximately 30 minutes. For more details on the hourly UV index in Watertown, you can check the information here.

Maximum UV Index Levels in Watertown for January

The chart shows the monthly maximum UV Index (UVI) for Watertown in January, 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 January, the maximum UV index in Watertown typically reaches 3, which falls under the moderate exposure category.

Data source: Watertown January 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 January 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 January’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 January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	5°C (41°F)	109 mm (4.3 inches)	87%	moderate
February Weather	8°C (46°F)	190 mm (7.5 inches)	87%	high
March Weather	12°C (53°F)	176 mm (6.9 inches)	85%	high
April Weather	15°C (60°F)	151 mm (5.9 inches)	82%	very high
May Weather	21°C (70°F)	123 mm (4.8 inches)	83%	very high
June Weather	25°C (76°F)	149 mm (5.9 inches)	82%	extreme
July Weather	26°C (80°F)	131 mm (5.1 inches)	78%	extreme
August Weather	25°C (78°F)	124 mm (4.9 inches)	67%	very high
September Weather	23°C (74°F)	130 mm (5.1 inches)	64%	very high
October Weather	17°C (64°F)	140 mm (5.5 inches)	74%	high
November Weather	9°C (49°F)	81 mm (3.2 inches)	87%	moderate
December Weather	8°C (46°F)	151 mm (6.0 inches)	88%	moderate