Climate Insights for Watertown

The climate in Watertown is cool. The average annual temperature is 9°C and approximately 1266mm of precipitation falls per year. Watertown receives a notable amount of rainfall throughout the year, including during its driest month. Watertown is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: July, August, June. The coldest months are January, February, December, when temperatures can drop to -7°C. Watertown experiences heavy snowfall, typically from January through December.

Temperatures in Watertown vary considerably across the year, with a 33°C difference between the coldest and warmest months. The warmest month is July, when average highs reach 26°C and the mean temperature sits around 22°C. The coldest month is January, when overnight lows fall to -7°C and the daily average is -4°C. Daily temperature variation is modest, with an average difference of 7°C between highs and lows. The sharpest temperature change occurs between October and November, with a 7°C shift in average temperatures.

Watertown is a fairly wet location, receiving approximately 1266mm of precipitation annually, which averages out to around 105mm per month. The wettest month is October, averaging 141mm of rainfall. July and December also tend to see above-average precipitation. The driest month is September, with just 75mm. That's 67mm less than October, the wettest month. Rainfall is relatively evenly distributed throughout the year, so there is no pronounced dry or wet season to plan around. Watertown receives heavy snowfall, accumulating around 209cm annually from January through December. The snowiest month is January, with approximately 55cm. Winter travel should account for significant snow cover.

Watertown is mildly breezy, with an average annual wind speed of 13km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is November, averaging 15km/h, though still comfortable for most outdoor activities. The calmest conditions occur in July, with average winds dropping to 10km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 5km/h gap between the calmest and windiest months. Wind tends to be stronger during winter months, driven by seasonal pressure systems. The seasonal averages break down to 14km/h in winter, 13km/h in spring, 11km/h in summer, 13km/h in autumn.

It is currently summer in Watertown, which began on June 21, 2026. Watertown is in the Northern Hemisphere, where spring begins in March, summer in June, autumn in September, and winter in December. The warmest period peaks in July at around 26°C, while the coldest stretch bottoms out in January near -7°C. Autumn is next, beginning on September 23, 2026 (7 days from now).

The best time to visit Watertown is during June and September, when the weather is most comfortable for travellers. During these months, average temperatures hover around 18°C with modest rainfall averaging 85mm per month. By contrast, July can be uncomfortably hot with highs reaching 26°C, while January is the coldest period with lows dropping to -7°C. Despite being the best months overall, some rain is still likely. Pack a waterproof layer and plan a mix of indoor and outdoor activities.

The table below shows monthly climate averages for Watertown based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Snow is measured in centimetres (cm) and reflects average monthly snowfall accumulation. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.