Climate and monthly weather forecast
Acton, MA

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Weather in January

January, the same as December, is a wintry winter month in Acton, Massachusetts, with an average temperature varying between 20.1°F (-6.6°C) and 32.5°F (0.3°C). With average high temperatures of 32.5°F (0.3°C) and lows of 20.1°F (-6.6°C), January is the coldest month. Weather in January »

Weather in February

The last month of the winter, February, is also a wintry month in Acton, Massachusetts, with an average temperature fluctuating between 21°F (-6.1°C) and 35.2°F (1.8°C). The advent of February brings an average high-temperature of a still wintry 35.2°F (1.8°C), exhibiting minor difference from the previous month. Weather in February »

Weather in March

March, the first month of the spring in Acton, is a chilly month, with an average temperature fluctuating between 28.9°F (-1.7°C) and 43°F (6.1°C). The shift into March is marked by a modest rise in the average high-temperature, moving from February's cold 35.2°F (1.8°C) to a frosty 43°F (6.1°C). Weather in March »

Weather in April

April is a mild spring month in Acton, Massachusetts, with temperature in the range of an average high of 55.9°F (13.3°C) and an average low of 39°F (3.9°C). April's onset brings a rise in the average high-temperature, moving from a frosty 43°F (6.1°C) in March to a mild 55.9°F (13.3°C). Weather in April »

Weather in May

May, the last month of the spring in Acton, is an enjoyable month, with an average temperature varying between 67.5°F (19.7°C) and 48.7°F (9.3°C). The shift into May brings an increase in the average high-temperature, moving from a refreshing 55.9°F (13.3°C) in April to an enjoyable 67.5°F (19.7°C). Weather in May »

Weather in June

June, the first month of the summer in Acton, is a warm month, with an average temperature varying between 56.5°F (13.6°C) and 75.6°F (24.2°C). Acton in June denotes a subtle temperature transition, adjusting from an average high of a comfortable 67.5°F (19.7°C) in May to a moderately hot 75.6°F (24.2°C). Weather in June »

Weather in July

July, the same as June, is a moderately hot summer month in Acton, Massachusetts, with an average temperature ranging between min 63.3°F (17.4°C) and max 82.4°F (28°C). July, with average temperatures reaching a high of 82.4°F (28°C) and a low of 63.3°F (17.4°C), is the warmest month. In July, the heat index is computed to be a hot 87.8°F (31°C). Weather in July »

Weather in August

August, the last month of the summer in Acton, is another warm month, with an average temperature ranging between max 81°F (27.2°C) and min 62.1°F (16.7°C). The start of August sees the average high-temperature at a still warm 81°F (27.2°C), showing little difference from July's 82.4°F (28°C). Weather in August »

Weather in September

September, the first month of the autumn in Acton, is also an agreeable month, with an average temperature fluctuating between 55.6°F (13.1°C) and 72.9°F (22.7°C). A moderate decline in average high-temperatures is noted in September, moving from a warm 81°F (27.2°C) in August to a pleasant 72.9°F (22.7°C). Weather in September »

Weather in October

October, like September, is another refreshing autumn month in Acton, Massachusetts, with temperature in the range of an average high of 60.1°F (15.6°C) and an average low of 46°F (7.8°C). The start of October involves a temperature drop, moving from a pleasant 72.9°F (22.7°C) in September to a moderate 60.1°F (15.6°C). Weather in October »

Weather in November

The last month of the autumn, November, is also a frosty month in Acton, Massachusetts, with an average temperature ranging between min 35.4°F (1.9°C) and max 48.6°F (9.2°C). The decrease of average high-temperatures is mild in November, with a decline from a moderate 60.1°F (15.6°C) in October to a chilly 48.6°F (9.2°C). Weather in November »

Weather in December

December, the first month of the winter in Acton, is also an icy month, with an average temperature varying between 38.3°F (3.5°C) and 27.3°F (-2.6°C). December implies a gentle temperature shift, with average high-temperatures reducing from November's chilly 48.6°F (9.2°C) to a cold 38.3°F (3.5°C). Weather in December »
Updated: Jun 16, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are the coldest months?

Acton notes the coldest temperatures in January, with a average high of 32.5°F (0.3°C) and a low of 20.1°F (-6.6°C).

How many days does it rain?

In Acton, during the entire year, the rain falls for 116.3 days and collects up to 15.87" (403mm) of precipitation.

When does it snow?

January through May, October through December are months with snowfall.

How many days does it snow?

Throughout the year, there are 25.5 snowfall days, and 11.42" (290mm) of snow is accumulated.

What are the months with the lowest UV index?

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

What is the most humid month?

February is the most humid month, with an average relative humidity of 79%.

What is the snowiest month?

The month with the most snowfall is February, when snow falls for 5.9 days and typically aggregates up to 2.87" (73mm) of snow.

What is the month with the least sunshine?

The month with the least sunshine is February, with an average of 4.5h of sunshine.

When is Daylight Saving Time (DST)?

On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts, and the time zone changes from EST to EDT. Daylight Saving Time ends Sunday, November 3. 2024, at 2:00 am, and the time zone reverts from EDT to EST.

What is the least humid month in Acton?

April is the least humid month, with an average relative humidity of 70%.

When it does not snow?

In Acton, snow does not fall in June through September.

When are the longest days?

The month with the longest days is June, with an average of 15h and 12min of daylight.

What is the month with the highest UV index?

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

What part of the year is the hottest?

July, recording an average high temperature of 82.4°F (28°C) and a low temperature of 63.3°F (17.4°C), is Acton's warmest month.

What month has the most sunshine?

With an average of 10.3h of sunshine, August has the most sunshine of the year.

What is the driest month?

September is the month with the least rainfall. Rain falls for 8.6 days and accumulates 0.79" (20mm) of precipitation.

What is the wettest month?

October is the month with the most rainfall. Rain falls for 10.6 days and accumulates 1.65" (42mm) of precipitation.

What is the month with the shortest days?

The month with the shortest days is December, with an average of 9h and 6min of daylight.

Average temperature
Acton, MA

Average temperature - Acton, MA

The warmest month (with the highest average high temperature) is July (82.4°F).
The month with the lowest average high temperature is January (32.5°F).

The month with the highest average low temperature is July (63.3°F).
The coldest month (with the lowest average low temperature) is January (20.1°F).

Average pressure
Acton, MA

Average pressure - Acton, MA

The month with the highest atmospheric pressure is November (30.07"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

Average wind speed
Acton, MA

Average wind speed - Acton, MA

The windiest month (with the highest average wind speed) is January (8.6mph).
The calmest month (with the lowest average wind speed) is August (5.5mph).

Average humidity
Acton, MA

Average humidity - Acton, MA

The month with the highest relative humidity is February (79%).
The month with the lowest relative humidity is April (70%).

Average rainfall
Acton, MA

Average rainfall - Acton, MA

The wettest month (with the highest rainfall) is October (1.65").
The driest month (with the least rainfall) is September (0.79").

Average rainfall days
Acton, MA

Average rainfall days - Acton, MA

The month with the highest number of rainy days is July (13.2 days).
The month with the least rainy days is February (5.4 days).

Average snowfall
Acton, MA

Average snowfall - Acton, MA

The month with the highest snowfall is February (2.87").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days
Acton, MA

Average snowfall days - Acton, MA

The month with the highest number of snowfall days is January (6.4 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight / Average sunshine
Acton, MA

Average daylight / Average sunshine - Acton, MA

The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 6min).

The month with the most sunshine is August (Average sunshine: 10h and 18min).
The month with the least sunshine is February (Average sunshine: 4h and 30min).

Average sunshine days
Acton, MA

Average sunshine days - Acton, MA

The month with the most sunshine days is November (19.5 days).
The month with the least sunshine days is April (15.8 days).

Average UV index
Acton, MA

Average UV index - Acton, MA

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

Average visibility
Acton, MA

Average visibility - Acton, MA

The months with the highest visibility are January, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is February (5mi).

Acton, Massachusetts, USA

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