Climate and monthly weather forecast
Onset, MA

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Weather in January

January, like December, in Onset, Massachusetts, is an icy winter month, with an average temperature ranging between max 36.9°F (2.7°C) and min 27.7°F (-2.4°C). January, characterized by an average high temperature of 36.9°F (2.7°C) and a low temperature of 27.7°F (-2.4°C), is generally the coldest month. Weather in January »

Weather in February

February, the last month of the winter in Onset, is another cold month, with an average temperature ranging between min 28.6°F (-1.9°C) and max 37.9°F (3.3°C). The beginning of February reveals an average high-temperature of a still wintry 37.9°F (3.3°C), showing minimal deviation from the previous month. Weather in February »

Weather in March

The first month of the spring, March, is also a wintry month in Onset, Massachusetts, with an average temperature varying between 42.3°F (5.7°C) and 33.8°F (1°C). The transition into March is marked with an average high-temperature of a still cold 42.3°F (5.7°C), showing an insignificant shift from February's 37.9°F (3.3°C). Weather in March »

Weather in April

April in Onset, Massachusetts, is a cool spring month, with an average temperature ranging between min 41.9°F (5.5°C) and max 50.5°F (10.3°C). Entering April, Onset notices a subtle temperature elevation, with the average high-temperature advancing from March's icy 42.3°F (5.7°C) to a cool 50.5°F (10.3°C). Weather in April »

Weather in May

The last month of the spring, May, is a refreshing month in Onset, Massachusetts, with an average temperature varying between 59.5°F (15.3°C) and 50.7°F (10.4°C). The start of May brings a shift in the average high-temperature, increasing from April's fresh 50.5°F (10.3°C) to a moderate 59.5°F (15.3°C). Weather in May »

Weather in June

June, the first month of the summer in Onset, is a refreshing month, with temperature in the range of an average high of 67.6°F (19.8°C) and an average low of 58.5°F (14.7°C). With the beginning of June, Onset's average high-temperature sees a minor increase, transitioning from a moderate 59.5°F (15.3°C) in May to an enjoyable 67.6°F (19.8°C). Weather in June »

Weather in July

July is a warm summer month in Onset, Massachusetts, with an average temperature ranging between max 75.6°F (24.2°C) and min 66.4°F (19.1°C). July, having an average high-temperature of 75.6°F (24.2°C) and an average low-temperature of 66.4°F (19.1°C), is the warmest month. Weather in July »

Weather in August

The last month of the summer, August, is also a moderately hot month in Onset, Massachusetts, with temperature in the range of an average low of 66.7°F (19.3°C) and an average high of 75.2°F (24°C). With the onset of August, a modest change to a still moderately hot 75.2°F (24°C) from July's 75.6°F (24.2°C) is noted in high-temperature. Weather in August »

Weather in September

The first month of the autumn, September, is still a pleasant month in Onset, Massachusetts, with an average temperature fluctuating between 61.2°F (16.2°C) and 68.9°F (20.5°C). Onset's September weather features a light decline in high-temperatures, reducing from a warm 75.2°F (24°C) in August to a pleasant 68.9°F (20.5°C). Weather in September »

Weather in October

October, the same as September, in Onset, Massachusetts, is a moderate autumn month, with temperature in the range of an average low of 52.3°F (11.3°C) and an average high of 60.1°F (15.6°C). The average high-temperature slightly decreases in October, shifting from a pleasant 68.9°F (20.5°C) in September to a mild 60.1°F (15.6°C). Weather in October »

Weather in November

The last month of the autumn, November, is also a fresh month in Onset, Massachusetts, with temperature in the range of an average high of 50.9°F (10.5°C) and an average low of 42.3°F (5.7°C). With November's onset, the weather shows a temperature decrease, transitioning from a refreshing 60.1°F (15.6°C) in October to a cool 50.9°F (10.5°C). Weather in November »

Weather in December

The first month of the winter, December, is still a cold month in Onset, Massachusetts, with an average temperature ranging between min 34.2°F (1.2°C) and max 42.4°F (5.8°C). With the arrival of December, Onset notices a mild change in the average high-temperature, sliding from November's fresh 50.9°F (10.5°C) to a wintry 42.4°F (5.8°C). Weather in December »
Updated: Feb 12, 2024 | Published by: Weather U.S. | About Us / Weather Forecasting / Data Sources

Frequently asked questions

What time of the year is the coldest in Onset?

January, with its high-temperature average of 36.9°F (2.7°C) and a low-temperature average of 27.7°F (-2.4°C), is the coldest month in Onset.

How much does it rain in Onset?

Throughout the year, in Onset, there are 157.4 rainfall days, and 32.2" (818mm) of precipitation is accumulated.

When does it snow in Onset?

January through April, October through December are months with snowfall in Onset.

How many days does it snow in Onset?

In Onset, during the entire year, snow falls for 21.7 days and aggregates up to 8.43" (214mm) of snow.

When is the lowest UV index in Onset?

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

When does it snow the most in Onset?

The months with the most snowfall in Onset are February and March, with an average 2.28" (58mm) of accumulated snow.

When is the ocean coldest in Onset?

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

What are the months with the least sunshine in Onset?

February and December, with an average of 4.8h of sunshine, are months with the least sunshine in Onset.

What are the least humid months in Onset?

March and November, with an average relative humidity of 74%, are the least humid months.

When is Daylight Saving Time (DST) in Onset?

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.

When it does not snow in Onset?

May through September are months without snowfall.

What are the most humid months in Onset?

June and July, with an average relative humidity of 81%, are most humid months in Onset, Massachusetts.

When are the longest days in Onset?

With an average of 15h and 12min of daylight, June has the longest days of the year in Onset.

What is the hottest time of year in Onset?

July is the warmest month in Onset, with the temperature often reaching an average high of 75.6°F (24.2°C) and an average low of 66.4°F (19.1°C).

When is the highest UV index in Onset?

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

What is the month with the warmest ocean in Onset?

The month with the warmest seawater is August, with an average ocean temperature of 68.5°F (20.3°C).

What month has the most sunshine in Onset?

With an average of 10.7h of sunshine, August has the most sunshine of the year in Onset.

What is the driest month in Onset?

September is the month with the least rainfall in Onset. Rain falls for 12.3 days and accumulates 1.81" (46mm) of precipitation.

What is the wettest month in Onset?

December is the month with the most rainfall. Rain falls for 12.5 days and accumulates 3.58" (91mm) of precipitation.

What is the month with the shortest days in Onset?

With an average of 9h and 12min of daylight, December has the shortest days of the year.

Average temperature
Onset, MA

Average temperature - Onset, MA

The warmest month (with the highest average high temperature) is July (75.6°F).
The month with the lowest average high temperature is January (36.9°F).

The month with the highest average low temperature is August (66.7°F).
The coldest month (with the lowest average low temperature) is January (27.7°F).

Average pressure
Onset, MA

Average pressure - Onset, 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).

Average wind speed
Onset, MA

Average wind speed - Onset, MA

The windiest month (with the highest average wind speed) is January (13.7mph).
The calmest month (with the lowest average wind speed) is August (8.7mph).

Average humidity
Onset, MA

Average humidity - Onset, MA

The months with the highest relative humidity are June and July (81%).
The months with the lowest relative humidity are March and November (74%).

Average rainfall
Onset, MA

Average rainfall - Onset, MA

The wettest month (with the highest rainfall) is December (3.58").
The driest month (with the least rainfall) is September (1.81").

Average rainfall days
Onset, MA

Average rainfall days - Onset, MA

The month with the highest number of rainy days is July (16 days).
The month with the least rainy days is January (9 days).

Average snowfall
Onset, MA

Average snowfall - Onset, MA

The months with the highest snowfall are February and March (2.28").
The months with the least snowfall are May, June, July, August and September (0").

Average snowfall days
Onset, MA

Average snowfall days - Onset, 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 and September (0 days).

Average sea temperature
Onset, MA

Average sea temperature - Onset, MA

The best month for swimming (with the highest average sea temperature) is August (68.4°F).
The coldest month (with the lowest average sea temperature) is February (38.2°F).

Average daylight / Average sunshine
Onset, MA

Average daylight / Average sunshine - Onset, 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 12min).

The month with the most sunshine is August (Average sunshine: 10h and 42min).
The months with the least sunshine are February and December (Average sunshine: 4h and 48min).

Average sunshine days
Onset, MA

Average sunshine days - Onset, MA

The month with the most sunshine days is November (16.3 days).
The month with the least sunshine days is April (12.5 days).

Average UV index
Onset, MA

Average UV index - Onset, 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).

Average visibility
Onset, MA

Average visibility - Onset, 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).

Onset, Massachusetts, USA

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