Monthly weather forecast and climate
Boston, MA

A beautiful natural park with the George Washington Monument in Boston, Massachusetts
A beautiful natural park with the George Washington Monument in Boston, Massachusetts

Weather in January

January, like December, in Boston, Massachusetts, is another cold winter month, with average temperature ranging between min 22.6°F (-5.2°C) and max 34.2°F (1.2°C). January is the coldest month, with an average high-temperature of 34.2°F (1.2°C) and an average low-temperature of 22.6°F (-5.2°C). Weather in January »

Weather in February

The last month of the winter, February, is also a wintry month in Boston, Massachusetts, with average temperature ranging between max 36.5°F (2.5°C) and min 23.5°F (-4.7°C). In February, the average high-temperature is practically the same as in January - a still wintry 36.5°F (2.5°C). Weather in February »

Weather in March

The first month of the spring, March, is a frosty month in Boston, Massachusetts, with average temperature fluctuating between 30.9°F (-0.6°C) and 43.5°F (6.4°C). In March, the average high-temperature slightly increases, from a cold 36.5°F (2.5°C) in February, to a chilly 43.5°F (6.4°C). Weather in March »

Weather in April

April in Boston, Massachusetts, is a fresh spring month, with temperature in the range of an average low of 40.5°F (4.7°C) and an average high of 55.2°F (12.9°C). In April, the average high-temperature increases, from a frosty 43.5°F (6.4°C) in March, to a fresh 55.2°F (12.9°C). Weather in April »

Weather in May

The last month of the spring, May, is an enjoyable month in Boston, Massachusetts, with temperature in the range of an average high of 66.4°F (19.1°C) and an average low of 50°F (10°C). In May, the average high-temperature increases, from a cool 55.2°F (12.9°C) in April, to an enjoyable 66.4°F (19.1°C). Weather in May »

Weather in June

The first month of the summer, June, is a warm month in Boston, Massachusetts, with average temperature varying between 57.6°F (14.2°C) and 74.3°F (23.5°C). In June, the average high-temperature slightly increases, from a comfortable 66.4°F (19.1°C) in May, to a moderately hot 74.3°F (23.5°C). Weather in June »

Weather in July

July, like June, in Boston, Massachusetts, is a moderately hot summer month, with temperature in the range of an average low of 64.9°F (18.3°C) and an average high of 81.7°F (27.6°C). July is the warmest month, with an average high-temperature of 81.7°F (27.6°C) and an average low-temperature of 64.9°F (18.3°C). The average heat index is calculated to a hot 86.5°F (30.3°C). Weather in July »

Weather in August

August, the last month of the summer, in Boston, is also a moderately hot month, with temperature in the range of an average high of 80.4°F (26.9°C) and an average low of 64°F (17.8°C). In Boston, the average high-temperature in August is practically the same as in July - a still warm 80.4°F (26.9°C). Weather in August »

Weather in September

The first month of the autumn, September, is also an agreeable month in Boston, Massachusetts, with average temperature varying between 72.7°F (22.6°C) and 57.4°F (14.1°C). In Boston, Massachusetts, the average high-temperature in September slightly decreases, from a moderately hot 80.4°F (26.9°C) in August, to a pleasant 72.7°F (22.6°C). Weather in September »

Weather in October

October, the same as September, is another comfortable autumn month in Boston, Massachusetts, with average temperature fluctuating between 48.4°F (9.1°C) and 61.5°F (16.4°C). In October, the average high-temperature decreases, from an agreeable 72.7°F (22.6°C) in September, to an enjoyable 61.5°F (16.4°C). Weather in October »

Weather in November

November, the last month of the autumn, in Boston, is another chilly month, with average temperature ranging between max 49.5°F (9.7°C) and min 37.9°F (3.3°C). In Boston, the average high-temperature drops, from a comfortable 61.5°F (16.4°C) in October, to a chilly 49.5°F (9.7°C). Weather in November »

Weather in December

December, the first month of the winter, in Boston, is still a cold month, with average temperature ranging between max 39.9°F (4.4°C) and min 29.7°F (-1.3°C). In Boston, the average high-temperature in December drops, from a chilly 49.5°F (9.7°C) in November, to a wintry 39.9°F (4.4°C). Weather in December »
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FAQ

What is the coldest month in Boston?

With an average high-temperature of 34.2°F (1.2°C) and an average low-temperature of 22.6°F (-5.2°C), January is the coldest month in Boston.

How much does it rain in Boston?

In Boston, Massachusetts, during the entire year, the rain falls for 141.4 days and collects up to 27.2" (691mm) of precipitation.

When does it snow in Boston?

January through May, October through December are months with snowfall in Boston, Massachusetts.

How many days does it snow in Boston?

In Boston, during the entire year, snow falls for 29.8 days, and aggregates up to 15.75" (400mm) of snow.

When is the lowest UV index in Boston?

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

What is the most humid month in Boston?

The most humid month in Boston, Massachusetts, is February, with an average relative humidity of 77%.

When does it snow the most in Boston?

February is the month with the most snowfall in Boston, Massachusetts. Snow falls for 7.6 days and accumulates 4.72" (120mm) of snow.

When is the ocean coldest in Boston?

February is the month with the coldest seawater, with an average ocean temperature of 38.1°F (3.4°C).

What is the month with the least sunshine in Boston?

With an average of 4.6h of sunshine, February has the least sunshine of the year in Boston.

What is the wettest month in Boston?

Months with the most rainfall in Boston are March, April and December, with an average 2.91" (74mm) of precipitation.

What is the least humid month in Boston?

April is the least humid month in Boston, with an average relative humidity of 69%.

When it does not snow in Boston?

June through September are months without snowfall.

When are the longest days in Boston?

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

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

Months with the highest UV index are June through August, with an average maximum UV index of 6.

What is the warmest month in Boston?

The warmest month in Boston, Massachusetts, is July, with an average high-temperature of 81.7°F (27.6°C) and an average low-temperature of 64.9°F (18.3°C).

What month is the ocean warmest in Boston?

August is the month with the warmest seawater, with an average ocean temperature of 68°F (20°C).

What month has the most sunshine in Boston?

August has the most sunshine of the year, with an average of 10.5h of sunshine.

What is the driest month in Boston?

The month with the least rainfall in Boston, Massachusetts, is September when the rain falls for 10 days and typically collects 1.26" (32mm) of precipitation.

What is the month with the shortest days in Boston?

The month with the shortest days is December, with an average of 9.1h of daylight.

Average pressure
Boston, MA

Average pressure - Boston, MA

The month with the highest atmospheric pressure is November (1018.1mbar).
The month with the lowest atmospheric pressure is June (1013.4mbar).

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Average wind speed
Boston, MA

Average wind speed - Boston, MA

The windiest month (with the highest average wind speed) is January (15.9km/h).
The calmest month (with the lowest average wind speed) is August (9.9km/h).

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Average rainfall
Boston, MA

Average rainfall - Boston, MA

The wettest months (with the highest rainfall) are March, April and December (74mm).
The driest month (with the least rainfall) is September (32mm).

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Average rainfall days
Boston, MA

Average rainfall days - Boston, MA

The month with the highest number of rainy days is May (15.3 days).
The month with the least rainy days is January (7.9 days).

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Average snowfall
Boston, MA

Average snowfall - Boston, MA

The month with the highest snowfall is February (120mm).
Months with the least snowfall are June, July, August and September (0mm).

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Average snowfall days
Boston, MA

Average snowfall days - Boston, MA

Months with the highest number of snowfall days are January and February (7.6 days).
Months with the least snowfall days are June, July, August and September (0 days).

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Average sea temperature
Boston, MA

Average sea temperature - Boston, MA

The best month for swimming (with the highest average sea temperature) is August (20°C).
The coldest month (with the lowest average sea temperature) is February (3.4°C).

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Average daylight / Average sunshine
Boston, MA

Average daylight / Average sunshine - Boston, MA

The month with the longest days is June (Average daylight: 15.2h).
The month with the shortest days is December (Average daylight: 9.1h).

The month with the most sunshine is August (Average sunshine: 10.5h).
The month with the least sunshine is February (Average sunshine: 4.6h).

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Average sunshine days
Boston, MA

Average sunshine days - Boston, MA

The month with the most sunshine days is September (17.7 days).
The month with the least sunshine days is April (13 days).

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Average UV index
Boston, MA

Average UV index - Boston, MA

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

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Average visibility
Boston, MA

Average visibility - Boston, MA

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (9km).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (9km).

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