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Chatham (MA) Weather and Climate: A Comprehensive Guide

Chatham experiences great temperature shifts. The city's weather can transition from warm days to cold weather. It is also known for its large amounts of rain/snowfall. Now, let’s explore all the climate details to give you a full picture.

Average maximum day and minimum night temperature

The climate in Chatham is known for significant temperature differences throughout the year, making the weather dynamic. Typically, average maximum daytime temperatures range from a comfortable 25°C in July to a chilly 3°C in the coolest month, February.

Nights are cooler, with lows often dropping to around -4°C during the colder months. Check out our detailed temperature page for more information.

Temperature ranges by month

Precipitation and rainy days

Chatham has a notably wet climate with abundant precipitation, recording 1172 mm of rain/snowfall per year. Chatham offers a pleasant mix of wetter and slightly drier months. The difference in precipitation between December (128 mm) and August (71 mm) is not too significant, making the climate enjoyable for visitors and residents alike.

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

Sunshine over the year

For those who appreciate different seasons, Chatham serves as an ideal destination. Expect longer, more sun-filled days in July with an average of 10.0 hours of sunshine daily, and embrace the darker days in January, offering only 4.9 hours of daily sunlight. Visit our detailed sunshine hours page for more information.

Monthly hours of sunshine

Data from: Nantucket, the United States of America (45 KM, 28 Miles).

Daily hours of sunshine

Data from: Nantucket, the United States of America (45 KM, 28 Miles).

Forecast for Chatham (MA)

Sat   Dec 21
2°C | -6°C
N 5 m/s
1.7 mm
overcast and small chance of slight rain

overcast and small chance of slight rain

Sun   Dec 22
-4°C | -8°C
NW 4 m/s
1.8 mm
overcast and  chance of slight snow

overcast and chance of slight snow

Mon   Dec 23
1°C | -7°C
W 2 m/s
1.2 mm
broken clouds and  chance of slight rain

broken clouds and chance of slight rain

The best time of year to visit Chatham in the United States of America

During the months of June, July, August and September you are most likely to experience good weather with pleasant average temperatures that fall between 20°C and 26°C.

Other facts from our historical weather data:
  • Which is the warmest month in Chatham?
    July has an average maximum temperature of 25°C and is the warmest month of the year.
  • Which is the coldest month in Chatham?
    The coldest month is February with an average maximum temperature of 3°C.
  • Which is the wettest month in Chatham?
    December tops the wettest month list with 128 mm of rainfall.
  • Which is the driest month in Chatham?
    August is the driest month with 71 mm of precipitation.
  • Which is the sunniest month in Chatham?
    July is the sunniest month with an average of 301 hours of sunshine.

  • No idea where to travel to this year? We have a tool that recommends destinations based on your ideal conditions. Find out where to go with our weather planner.