Plymouth (MA) Weather & Climate: Best Time to Visit

Depending on the time of the year, temperatures range from comfortable to chilly in Plymouth. Average daytime temperatures reach a comfortable 28°C (82°F) in July. In January, the coolest month of the year, temperatures drop to a chilly 4°C (39°F).

At night, temperatures range from around 18°C (64°F) in July to -7°C (19°F) in January.

Check out our detailed temperature page for more information.

Temperature ranges by month

Plymouth has a relatively rain/snowy climate with high precipitation levels, averaging 1331 mm (52 in) of rain/snowfall annually. Despite minor fluctuations, Plymouth enjoys fairly consistent precipitation throughout the year. In December, you can expect around 133 mm (5.2 in) of precipitation, while in September, Plymouth receives about 89 mm (3.5 in). For more details, please visit our Plymouth Precipitation page.

The mean monthly precipitation over the year, including rain, hail, and snow

The average number of days each month with precipitation

Plymouth can be enjoyed more throughout the sunniest month of May under a blue sky, with approximately 10.0 hours of sunshine daily. In contrast, the city experiences much darker days in December, with only 4.7 hours of sunlight per day.

Visit our detailed sunshine hours page for more information.

Monthly hours of sunshine

Daily hours of sunshine

Daily percentage of sunshine

The relative humidity is high throughout the year in Plymouth.

The city experiences its highest humidity in August, reaching 72%. In February, the humidity drops to its lowest level at 62%. What does this mean? Read our detailed page on humidity levels for further details.

Relative humidity over the year