Climate Insights for Cohasset

The climate in Cohasset is temperate. The average annual temperature is 11°C and approximately 1287mm of precipitation falls per year. Cohasset receives a notable amount of rainfall throughout the year, including during its driest month. Cohasset is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: August, July, September. The coldest months are February, January, March, when temperatures can drop to -1°C. Snowfall occurs from January to December, with around 81cm accumulating over the season.

Temperatures in Cohasset vary considerably across the year, with a 24°C difference between the coldest and warmest months. August is the warmest month, though highs remain moderate at 23°C with a mean of 21°C. The coldest month is February, when overnight lows fall to -1°C and the daily average is 1°C. Daily temperature variation is modest, with an average difference of 4°C between highs and lows. The sharpest temperature change occurs between October and November, with a 6°C shift in average temperatures.

Cohasset is a fairly wet location, receiving approximately 1287mm of precipitation annually, which averages out to around 107mm per month. The wettest month is December, averaging 148mm of rainfall. October and January also tend to see above-average precipitation. The driest month is August, with just 65mm. That's 83mm less than December, the wettest month. Rainfall is relatively evenly distributed throughout the year, so there is no pronounced dry or wet season to plan around. Snowfall is a regular feature from January to December, with around 81cm accumulating over the season. February typically sees the most snow at around 26cm.

Cohasset is moderately windy, with an average annual wind speed of 30km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is January, averaging 35km/h, which can feel quite blustery and may affect outdoor activities. The calmest conditions occur in August, with average winds dropping to 23km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 12km/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 34km/h in winter, 31km/h in spring, 24km/h in summer, 30km/h in autumn.

It is currently spring in Cohasset, which began on March 20, 2026. Cohasset 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 August at around 23°C, while the coldest stretch bottoms out in February near -1°C. Summer is next, beginning on June 21, 2026 — 89 days from now.

The best time to visit Cohasset is during June, July, August and September, when the weather is most comfortable for travellers. During these months, average temperatures hover around 19°C with modest rainfall averaging 83mm per month. By contrast, February can be quite cold with temperatures dropping to -1°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 Cohasset 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.