Chatham
Massachusetts, USA
Long-term weather forecast
Long-term weather forecast

Monthly weather forecast and climate
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
January, like December, in Chatham, Massachusetts, is a wintry winter month, with average temperature ranging between min 24.1°F (-4.4°C) and max 37.6°F (3.1°C). The coldest month is January, with an average high-temperature of 37.6°F (3.1°C) and an average low-temperature of 24.1°F (-4.4°C). Weather in January »
The last month of the winter, February, is another cold month in Chatham, Massachusetts, with temperature in the range of an average low of 25°F (-3.9°C) and an average high of 38.3°F (3.5°C). In Chatham, the average high-temperature in February is relatively the same as in January - a still cold 38.3°F (3.5°C). Weather in February »

The first month of the spring, March, is a chilly month in Chatham, Massachusetts, with average temperature varying between 30.7°F (-0.7°C) and 42.8°F (6°C). In March, the average high-temperature is practically the same as in February - a frosty 42.8°F (6°C). Weather in March »

April is a fresh spring month in Chatham, Massachusetts, with average temperature ranging between min 39.6°F (4.2°C) and max 50.5°F (10.3°C). In Chatham, Massachusetts, the average high-temperature slightly increases, from a chilly 42.8°F (6°C) in March, to a fresh 50.5°F (10.3°C). Weather in April »

May, the last month of the spring, in Chatham, is a mild month, with temperature in the range of an average high of 59°F (15°C) and an average low of 48°F (8.9°C). In May, the average high-temperature marginally rises, from a fresh 50.5°F (10.3°C) in April, to a moderate 59°F (15°C). Weather in May »

June, the first month of the summer, in Chatham, is an agreeable month, with average temperature ranging between min 56.7°F (13.7°C) and max 68.4°F (20.2°C). In Chatham, Massachusetts, the average high-temperature in June rises, from a moderate 59°F (15°C) in May, to a pleasant 68.4°F (20.2°C). Weather in June »

July is a warm summer month in Chatham, Massachusetts, with average temperature ranging between min 62.8°F (17.1°C) and max 74.8°F (23.8°C). July is the warmest month, with an average high-temperature of 74.8°F (23.8°C) and an average low-temperature of 62.8°F (17.1°C). Weather in July »

August, the last month of the summer, in Chatham, is also a moderately hot month, with average temperature varying between 74.7°F (23.7°C) and 62.6°F (17°C). In Chatham, the average high-temperature is almost the same as in July - a still moderately hot 74.7°F (23.7°C). Weather in August »

September, the first month of the autumn, in Chatham, is also an agreeable month, with average temperature fluctuating between 57.7°F (14.3°C) and 69.4°F (20.8°C). In September, the average high-temperature is almost the same as in August - a pleasant 69.4°F (20.8°C). Weather in September »

October, like September, is another mild autumn month in Chatham, Massachusetts, with average temperature varying between 47.8°F (8.8°C) and 60.1°F (15.6°C). In October, the average high-temperature decreases, from a pleasant 69.4°F (20.8°C) in September, to a mild 60.1°F (15.6°C). Weather in October »

November, the last month of the autumn, in Chatham, is another cool month, with average temperature varying between 39.6°F (4.2°C) and 51.6°F (10.9°C). In Chatham, Massachusetts, the average high-temperature in November marginally drops, from a mild 60.1°F (15.6°C) in October, to a fresh 51.6°F (10.9°C). Weather in November »

The first month of the winter, December, is also a frosty month in Chatham, Massachusetts, with average temperature ranging between max 42.8°F (6°C) and min 30.2°F (-1°C). In December, the average high-temperature slightly decreases, from a fresh 51.6°F (10.9°C) in November, to a frosty 42.8°F (6°C). Weather in December »

What is the coldest month in Chatham?

With an average high-temperature of 37.6°F (3.1°C) and an average low-temperature of 24.1°F (-4.4°C), January is the coldest month in Chatham.

How many days does it rain in Chatham?

In Chatham, during the entire year, the rain falls for 124 days and collects up to 47" (1195mm) of precipitation.

When does it snow in Chatham?

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

How much does it snow in Chatham?

Throughout the year, 26.6" (675.6mm) of snow is accumulated.

What is the month with the least sunshine in Chatham?

January, November and December, with an average of 5h of sunshine, are months with the least sunshine.

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

Months with the lowest UV index are January and December, with an average maximum UV index of 1.

What is the snowiest month in Chatham?

February is the month with the most snowfall, with 10.3" (261.6mm) of accumulated snow.

What is the wettest month in Chatham?

March is the month with the most rainfall in Chatham, Massachusetts. Rain falls for 12 days and accumulates 4.9" (123.2mm) of precipitation.

When is the ocean coldest 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). For swimming, this is considered very dangerous and immediately life-threatening. Total loss of breathing control instantly occurs, and clear thinking becomes almost impossible. A specialized swimsuit is obligatory to minimize thermal loss.

When are the longest days in Chatham?

The month with the longest days in Chatham, Massachusetts, is June, with an average of 15.2h of daylight.

What are the months with the most sunshine in Chatham?

Months with the most sunshine in Chatham, Massachusetts, are June and July, with an average of 9h of sunshine.

When is the highest UV index in Chatham?

June through August, with an average maximum UV index of 8, are months with the highest UV index in Chatham.

What is the warmest month in Chatham?

July is the warmest month in Chatham, Massachusetts, with an average high-temperature of 74.8°F (23.8°C) and an average low-temperature of 62.8°F (17.1°C).

What is the driest month in Chatham?

The month with the least rainfall in Chatham is August when the rain falls for 8 days and typically collects 3.2" (81.3mm) of precipitation.

What is the month with the warmest ocean in Chatham?

The month with the warmest seawater in Chatham is August, with an average ocean temperature of 67.6°F (19.8°C). For most, swimming in 67.6°F (19.8°C) is not an enjoyable activity. Furthermore, controlling your breathing becomes progressively more difficult as the water temperature decreases from 69.8°F (21°C) to 59°F (15°C).

What is the month with the shortest days in Chatham?

The month with the shortest days in Chatham is December, with an average of 9.2h of daylight.
Average temperature - Chatham, MA
Average rainfall - Chatham, MA
Average rainfall days - Chatham, MA
Average snowfall - 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).

Average daylight / Average sunshine - Chatham, MA