Climate and monthly weather forecast
Chatham, MA

The calm blue water and white sand on a typical beach in Cape Cod, with a visible path and a far view of the high Chatham Lighthouse, Massachusetts
The calm blue water and white sand on a typical beach in Cape Cod, with a visible path and a far view of the high Chatham Lighthouse, Massachusetts

Weather in January

January, like December, in Chatham, Massachusetts, is a wintry winter month, with an average temperature varying between 31.6°F (-0.2°C) and 39°F (3.9°C). January and February, with an average high-temperature of 39°F (3.9°C), are the coldest months. Weather in January »

Weather in February

February, the last month of the winter in Chatham, is also a wintry month, with temperature in the range of an average low of 32°F (0°C) and an average high of 39°F (3.9°C). The coldest months are January and February, with an average high-temperature of 39°F (3.9°C). Weather in February »

Weather in March

March, the first month of the spring in Chatham, is still a cold month, with an average temperature varying between 35.4°F (1.9°C) and 41°F (5°C). In Chatham, the average high-temperature in March is practically the same as in February - a still wintry 41°F (5°C). Weather in March »

Weather in April

April in Chatham, Massachusetts, is a chilly spring month, with an average temperature varying between 42.4°F (5.8°C) and 46.9°F (8.3°C). In April, the average high-temperature marginally rises from a wintry 41°F (5°C) in March to a frosty 46.9°F (8.3°C). Weather in April »

Weather in May

The last month of the spring, May, is a cool month in Chatham, Massachusetts, with temperature in the range of an average low of 50.5°F (10.3°C) and an average high of 54.3°F (12.4°C). In Chatham, Massachusetts, the average high-temperature in May marginally rises from a frosty 46.9°F (8.3°C) in April to a fresh 54.3°F (12.4°C). Weather in May »

Weather in June

June, the first month of the summer in Chatham, is a comfortable month, with temperature in the range of an average high of 63°F (17.2°C) and an average low of 58.8°F (14.9°C). In June, the average high-temperature slightly increases from a cool 54.3°F (12.4°C) in May to a comfortable 63°F (17.2°C). Weather in June »

Weather in July

July in Chatham, Massachusetts, is an agreeable summer month, with temperature in the range of an average high of 70.3°F (21.3°C) and an average low of 67.1°F (19.5°C). In Chatham, the average high-temperature in July marginally rises from an enjoyable 63°F (17.2°C) in June to a pleasant 70.3°F (21.3°C). Weather in July »

Weather in August

The last month of the summer, August, is also an agreeable month in Chatham, Massachusetts, with an average temperature varying between 71.6°F (22°C) and 68.2°F (20.1°C). The warmest month is August, with an average high-temperature of 71.6°F (22°C) and an average low-temperature of 68.2°F (20.1°C). Weather in August »

Weather in September

The first month of the autumn, September, is still a comfortable month in Chatham, Massachusetts, with an average temperature varying between 63.3°F (17.4°C) and 66.6°F (19.2°C). In September, the average high-temperature is almost the same as in August - an enjoyable 66.6°F (19.2°C). Weather in September »

Weather in October

October, the same as September, in Chatham, Massachusetts, is a moderate autumn month, with an average temperature fluctuating between 59.5°F (15.3°C) and 54.9°F (12.7°C). In October, the average high-temperature slightly decreases from a comfortable 66.6°F (19.2°C) in September to a mild 59.5°F (15.3°C). Weather in October »

Weather in November

November, the last month of the autumn in Chatham, is another cool month, with an average temperature varying between 51.3°F (10.7°C) and 45.5°F (7.5°C). In Chatham, the average high-temperature in November slightly decreases from a moderate 59.5°F (15.3°C) in October to a cool 51.3°F (10.7°C). Weather in November »

Weather in December

The first month of the winter, December, is still a chilly month in Chatham, Massachusetts, with an average temperature fluctuating between 44.4°F (6.9°C) and 37.6°F (3.1°C). In December, the average high-temperature slightly decreases from a fresh 51.3°F (10.7°C) in November to a chilly 44.4°F (6.9°C). Weather in December »
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FAQ

What is the coldest month in Chatham?

The coldest months in Chatham, Massachusetts, are January and February, with an average high-temperature of 39°F (3.9°C).

How much does it rain in Chatham?

Throughout the year, there are 142.4 rainfall days, and 22.09" (561mm) of precipitation is accumulated.

When does it snow in Chatham?

Months with snowfall in Chatham, Massachusetts, are January through April, November and December.

How many days does it snow in Chatham?

Throughout the year, there are 20.8 snowfall days, and 4.37" (111mm) of snow is accumulated.

What is the month with the lowest UV index in Chatham?

The months with the lowest UV index are January through March, November and December, with an average maximum UV index of 2.

What is the snowiest month in Chatham?

The month with the most snowfall is February, when snow falls for 5 days and typically aggregates up to 1.38" (35mm) of snow.

What is the month with the coldest ocean in Chatham?

March is the month with the coldest seawater in Chatham, Massachusetts, with an average ocean temperature of 39.9°F (4.4°C).

When is Daylight Saving Time (DST) in Chatham?

On Sunday, March 13. 2022, at 2:00 am, Daylight Saving Time starts, and the time zone changes from EST to EDT. Daylight Saving Time ends Sunday, November 6. 2022, at 2:00 am, and the time zone reverts from EDT to EST.

When it does not snow in Chatham?

In Chatham, snow does not fall in May through October.

What is the most humid month in Chatham?

The months with the highest humidity in Chatham are June and July, with an average relative humidity of 85%.

When are the longest days in Chatham?

With an average of 15h and 9min of daylight, June has the longest days of the year.

What is the month with the highest UV index in Chatham?

July and August, with an average maximum UV index of 6, are months with the highest UV index.

What is the warmest month in Chatham?

With an average high-temperature of 71.6°F (22°C) and an average low-temperature of 68.2°F (20.1°C), August is the warmest month.

What month is the ocean warmest in Chatham?

August is the month with the warmest seawater in Chatham, Massachusetts, with an average ocean temperature of 67.6°F (19.8°C).

What month has the most sunshine in Chatham?

The month with the most sunshine in Chatham, Massachusetts, is August, with an average of 10.7h of sunshine.

What is the rainiest month in Chatham?

October is the month with the most rainfall. Rain falls for 13.4 days and accumulates 2.83" (72mm) of precipitation.

What is the least humid month in Chatham?

November is the least humid month, with an average relative humidity of 74%.

What is the driest month in Chatham?

November is the month with the least rainfall in Chatham. Rain falls for 11.5 days and accumulates 1.46" (37mm) of precipitation.

What is the month with the shortest days in Chatham?

The month with the shortest days in Chatham, Massachusetts, is December, with an average of 9h and 13min of daylight.

What is the month with the least sunshine in Chatham?

The month with the least sunshine is December, with an average of 4.3h of sunshine.

Average temperature
Chatham, MA

Average temperature - Chatham, MA

The warmest month (with the highest average high temperature) is August (71.6°F).
The months with the lowest average high temperature are January and February (39°F).

The month with the highest average low temperature is August (68.2°F).
The coldest month (with the lowest average low temperature) is January (31.6°F).

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Average pressure
Chatham, MA

Average pressure - Chatham, MA

The month with the highest atmospheric pressure is November (30.06"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).

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Average wind speed
Chatham, MA

Average wind speed - Chatham, MA

The windiest month (with the highest average wind speed) is January (18mph).
The calmest month (with the lowest average wind speed) is August (11.4mph).

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Average humidity
Chatham, MA

Average humidity - Chatham, MA

The months with the highest relative humidity are June and July (85%).
The month with the lowest relative humidity is November (74%).

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Average rainfall
Chatham, MA

Average rainfall - Chatham, MA

The wettest month (with the highest rainfall) is October (2.83").
The driest month (with the least rainfall) is November (1.46").

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Average rainfall days
Chatham, MA

Average rainfall days - Chatham, MA

The month with the highest number of rainy days is May (14.6 days).
The month with the least rainy days is February (8.3 days).

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Average snowfall
Chatham, MA

Average snowfall - Chatham, MA

The month with the highest snowfall is February (1.38").
The months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days
Chatham, MA

Average snowfall days - Chatham, MA

The month with the highest number of snowfall days is January (6 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

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Average sea temperature
Chatham, MA

Average sea temperature - Chatham, MA

The best month for swimming (with the highest average sea temperature) is August (67.6°F).
The coldest month (with the lowest average sea temperature) is March (39.8°F).

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Average daylight / Average sunshine
Chatham, MA

Average daylight / Average sunshine - Chatham, MA

The month with the longest days is June (Average daylight: 15h and 9min).
The month with the shortest days is December (Average daylight: 9h and 13min).

The month with the most sunshine is August (Average sunshine: 10h and 42min).
The month with the least sunshine is December (Average sunshine: 4h and 18min).

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Average sunshine days
Chatham, MA

Average sunshine days - Chatham, MA

The month with the most sunshine days is August (17.6 days).
The month with the least sunshine days is January (13 days).

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Average UV index
Chatham, MA

Average UV index - Chatham, MA

The months with the highest UV index are July and August (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).

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Average visibility
Chatham, MA

Average visibility - Chatham, MA

The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).

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