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Weather in Chatham, MA · National Weather Service + NOAA

Chatham has milder winters than most of Massachusetts

Chatham has chilly winters and pleasant summers. A typical July afternoon reaches 77°, a January night drops to 25°, and about 25 inches of snow falls in a normal winter. In November, a normal day reaches 52° and a normal night drops to 39°.

Winter 41°/28°Spring 53°/39°Summer 75°/61°Fall 61°/48°
Right now
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Sunrise 6:13 am · sunset 4:33 pm

Getting the latest forecast from the National Weather Service…

What stands out about Chatham’s weather

Read from 30 years of NOAA records. Each one opens the full story on the Climate page.

Climate →
Milder winters than most of MassachusettsJanuary nights average 25°, milder than 536 of 541 Massachusetts towns.Cool summersJuly afternoons average 77°, cooler than 97% of U.S. towns.A long growing season221 frost-free days, from Apr 5 to Nov 15.Warming faster than mostThe last 30 years averaged 2.1° warmer than the 1900s, a bigger shift than 96% of U.S. towns.
A normal year

Where today sits in Chatham’s year

Typical highs and lows month by month, from 30 years of NOAA records.

Full climate →
Winter
41° / 28°
7 days with an inch or more of snow
Spring
53° / 39°
Last frost around Apr 5
Summer
75° / 61°
90° days are rare
Fall now
61° / 48°
First frost around Nov 15
13 daysuntil the usual first frost (Nov 15)
Best months to be outside
JunJulAugSep
Highs of 62–84° and lows of 40° or more
How much snow does Chatham get?About 25 inches a winter.When is it wettest?December, with 4.7 inches.Is it warmer than it used to be?+2.1° vs. the 20th century.

Weather talk

Road reports, first frosts and storm memories from neighbors in Chatham.

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Forecast, conditions and alerts: National Weather Service. Climate: NOAA NCEI U.S. Climate Normals, 1991–2020 and 1901–2000. Temperatures and rainfall come from NOAA’s gridded normals for Chatham itself (about a 3-mile square). Snow, frost dates and day counts: the NOAA station at Chatham, MA (4 mi). Sunrise and sunset are calculated from the town’s position. Normals are 30-year averages, not a forecast.