Climate and monthly weather forecast
Waltham, MA

Weather in January

January, the same as December, is a wintry winter month in Waltham, Massachusetts, with an average temperature varying between 21.6°F (-5.8°C) and 33.3°F (0.7°C). With an average high-temperature of 33.3°F (0.7°C) and an average low-temperature of 21.6°F (-5.8°C), January is the coldest month. Weather in January »

Weather in February

February, the last month of the winter in Waltham, is also a wintry month, with temperature in the range of an average low of 22.5°F (-5.3°C) and an average high of 36.1°F (2.3°C). In Waltham, the average high-temperature in February is practically the same as in January - a still wintry 36.1°F (2.3°C). Weather in February »

Weather in March

March, the first month of the spring in Waltham, is a chilly month, with an average temperature varying between 29.7°F (-1.3°C) and 43.3°F (6.3°C). In Waltham, Massachusetts, the average high-temperature in March marginally rises from a wintry 36.1°F (2.3°C) in February to a frosty 43.3°F (6.3°C). Weather in March »

Weather in April

April is a mild spring month in Waltham, Massachusetts, with an average temperature ranging between min 39.7°F (4.3°C) and max 55.9°F (13.3°C). In April, the average high-temperature rises from a chilly 43.3°F (6.3°C) in March to a moderate 55.9°F (13.3°C). Weather in April »

Weather in May

The last month of the spring, May, is a comfortable month in Waltham, Massachusetts, with an average temperature varying between 66.9°F (19.4°C) and 49.6°F (9.8°C). In Waltham, Massachusetts, the average high-temperature in May rises from a moderate 55.9°F (13.3°C) in April to a comfortable 66.9°F (19.4°C). Weather in May »

Weather in June

June, the first month of the summer in Waltham, is a moderately hot month, with temperature in the range of an average low of 56.8°F (13.8°C) and an average high of 75.4°F (24.1°C). In Waltham, the average high-temperature in June slightly increases from an enjoyable 66.9°F (19.4°C) in May to a warm 75.4°F (24.1°C). Weather in June »

Weather in July

July, like June, in Waltham, Massachusetts, is another warm summer month, with temperature in the range of an average high of 82°F (27.8°C) and an average low of 64°F (17.8°C). The warmest month is July, with an average high-temperature of 82°F (27.8°C) and an average low-temperature of 64°F (17.8°C). In July, the average heat index is evaluated at a tropical 87.8°F (31°C). Weather in July »

Weather in August

August, the last month of the summer in Waltham, is also a moderately hot month, with an average temperature fluctuating between 63°F (17.2°C) and 81°F (27.2°C). In Waltham, the average high-temperature in August is practically the same as in July - a still warm 81°F (27.2°C). Weather in August »

Weather in September

The first month of the autumn, September, is also an agreeable month in Waltham, Massachusetts, with temperature in the range of an average low of 56.3°F (13.5°C) and an average high of 73.2°F (22.9°C). In September, the average high-temperature slightly decreases from a warm 81°F (27.2°C) in August to an agreeable 73.2°F (22.9°C). Weather in September »

Weather in October

October, the same as September, in Waltham, Massachusetts, is a moderate autumn month, with an average temperature ranging between min 46.9°F (8.3°C) and max 60.6°F (15.9°C). In Waltham, the average high-temperature in October decreases from a pleasant 73.2°F (22.9°C) in September to a mild 60.6°F (15.9°C). Weather in October »

Weather in November

The last month of the autumn, November, is also a frosty month in Waltham, Massachusetts, with an average temperature varying between 36.5°F (2.5°C) and 49.1°F (9.5°C). In November, the average high-temperature decreases from a moderate 60.6°F (15.9°C) in October to a frosty 49.1°F (9.5°C). Weather in November »

Weather in December

The first month of the winter, December, is also a wintry month in Waltham, Massachusetts, with an average temperature varying between 39.2°F (4°C) and 28.6°F (-1.9°C). In Waltham, the average high-temperature in December drops from a chilly 49.1°F (9.5°C) in November to a cold 39.2°F (4°C). Weather in December »
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FAQ

What is the coldest month in Waltham?

With an average high-temperature of 33.3°F (0.7°C) and an average low-temperature of 21.6°F (-5.8°C), January is the coldest month in Waltham.

How many days does it rain in Waltham?

Throughout the year, there are 106.3 rainfall days, and 8.5" (216mm) of precipitation is accumulated.

When does it snow in Waltham?

January through May, November and December are months with snowfall in Waltham, Massachusetts.

How many days does it snow in Waltham?

In Waltham, during the entire year, snow falls for 19.6 days and aggregates up to 4.02" (102mm) of snow.

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

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

What is the most humid month in Waltham?

With an average relative humidity of 78%, February is the most humid month in Waltham.

What is the month with the least sunshine in Waltham?

With an average of 4.7h of sunshine, February has the least sunshine of the year in Waltham.

When is Daylight Saving Time (DST) in Waltham?

On Sunday, March 12. 2023, at 2:00 am, Daylight Saving Time starts in Waltham, and the time zone changes from EST to EDT. Daylight Saving Time ends Sunday, November 5. 2023, at 2:00 am, and the time zone reverts from EDT to EST.

What is the least humid month in Waltham?

The least humid month in Waltham, Massachusetts, is April, with an average relative humidity of 70%.

What is the rainiest month in Waltham?

The wettest months in Waltham, Massachusetts, are April and November, with an average 0.87" (22mm) of rainfall.

When it does not snow in Waltham?

In Waltham, Massachusetts, snow does not fall in June through October.

When are the longest days in Waltham?

With an average of 15h and 14min of daylight, June has the longest days of the year in Waltham.

What are the months with the highest UV index in Waltham?

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

What is the warmest month in Waltham?

The warmest month in Waltham, Massachusetts, is July, with an average high-temperature of 82°F (27.8°C) and an average low-temperature of 64°F (17.8°C).

What month has the most sunshine in Waltham?

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

What is the driest month in Waltham?

September is the month with the least rainfall in Waltham, Massachusetts. Rain falls for 8.3 days and accumulates 0.35" (9mm) of precipitation.

What is the snowiest month in Waltham?

The month with the most snowfall in Waltham, Massachusetts, is December, when snow falls for 3.1 days and typically aggregates up to 1.14" (29mm) of snow.

What is the month with the shortest days in Waltham?

The month with the shortest days is December, with an average of 9h and 8min of daylight.

Average pressure
Waltham, MA

Average pressure - Waltham, 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).

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Average wind speed
Waltham, MA

Average wind speed - Waltham, MA

The windiest month (with the highest average wind speed) is January (9.1mph).
The calmest month (with the lowest average wind speed) is August (5.8mph).

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Average rainfall
Waltham, MA

Average rainfall - Waltham, MA

The wettest months (with the highest rainfall) are April and November (0.87").
The driest month (with the least rainfall) is September (0.35").

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Average rainfall days
Waltham, MA

Average rainfall days - Waltham, MA

The month with the highest number of rainy days is July (12.4 days).
The month with the least rainy days is January (5.3 days).

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Average snowfall
Waltham, MA

Average snowfall - Waltham, MA

The month with the highest snowfall is December (1.14").
The months with the least snowfall are June, July, August, September and October (0").

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Average snowfall days
Waltham, MA

Average snowfall days - Waltham, MA

The month with the highest number of snowfall days is February (5.4 days).
The months with the least snowfall days are June, July, August, September and October (0 days).

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Average daylight / Average sunshine
Waltham, MA

Average daylight / Average sunshine - Waltham, MA

The month with the longest days is June (Average daylight: 15h and 14min).
The month with the shortest days is December (Average daylight: 9h and 8min).

The month with the most sunshine is August (Average sunshine: 10h and 30min).
The month with the least sunshine is February (Average sunshine: 4h and 42min).

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Average sunshine days
Waltham, MA

Average sunshine days - Waltham, MA

The month with the most sunshine days is January (22.2 days).
The month with the least sunshine days is June (15.8 days).

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Average UV index
Waltham, MA

Average UV index - Waltham, 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).

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Average visibility
Waltham, MA

Average visibility - Waltham, 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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