Climate and monthly weather forecast
South Yarmouth, MA

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Weather in January

January, the same as December, is a wintry winter month in South Yarmouth, Massachusetts, with an average temperature varying between 30.6°F (-0.8°C) and 38.5°F (3.6°C). January, recording an average high temperature of 38.5°F (3.6°C) and a low temperature of 30.6°F (-0.8°C), is South Yarmouth's coldest month. Weather in January »

Weather in February

February, the last month of the winter in South Yarmouth, is also a wintry month, with an average temperature ranging between min 31.1°F (-0.5°C) and max 38.8°F (3.8°C). South Yarmouth starts February with an average high-temperature of a still cold 38.8°F (3.8°C), a minor shift from January's 38.5°F (3.6°C). Weather in February »

Weather in March

March, the first month of the spring in South Yarmouth, is also a wintry month, with an average temperature varying between 41.4°F (5.2°C) and 35.6°F (2°C). South Yarmouth experiences a transition to a still icy 41.4°F (5.2°C) in average high-temperatures with the arrival of March, not greatly differing from February's 38.8°F (3.8°C). Weather in March »

Weather in April

April in South Yarmouth, Massachusetts, is a chilly spring month, with an average temperature varying between 47.1°F (8.4°C) and 42.4°F (5.8°C). South Yarmouth observes a slight uplift in the average high-temperature with the onset of April, adjusting from March's icy 41.4°F (5.2°C) to a frosty 47.1°F (8.4°C). Weather in April »

Weather in May

The last month of the spring, May, is a cool month in South Yarmouth, Massachusetts, with an average temperature ranging between max 55°F (12.8°C) and min 51.3°F (10.7°C). A minor escalation in the average high-temperature is seen with the onset of May, moving from a frosty 47.1°F (8.4°C) in April to a fresh 55°F (12.8°C). Weather in May »

Weather in June

The first month of the summer, June, is a comfortable month in South Yarmouth, Massachusetts, with an average temperature varying between 59.4°F (15.2°C) and 63.5°F (17.5°C). As May transitions into June, South Yarmouth notices a gentle rise in the average high-temperature, transitioning from a fresh 55°F (12.8°C) to a comfortable 63.5°F (17.5°C). Weather in June »

Weather in July

July in South Yarmouth, Massachusetts, is a pleasant summer month, with an average temperature fluctuating between 67.6°F (19.8°C) and 71.6°F (22°C). The average high-temperature mildly increases in July, edging from a comfortable 63.5°F (17.5°C) in June to an agreeable 71.6°F (22°C). Weather in July »

Weather in August

August, the last month of the summer in South Yarmouth, is another pleasant month, with an average temperature varying between 68.5°F (20.3°C) and 72.1°F (22.3°C). In South Yarmouth, the month of August registers the highest temperatures, averaging 72.1°F (22.3°C) at the peak and 68.5°F (20.3°C) at the lowest. Weather in August »

Weather in September

The first month of the autumn, September, is still a refreshing month in South Yarmouth, Massachusetts, with temperature in the range of an average low of 63°F (17.2°C) and an average high of 67.1°F (19.5°C). The introduction of September notes a subtle temperature variation to an enjoyable 67.1°F (19.5°C) from August's 72.1°F (22.3°C). Weather in September »

Weather in October

October, like September, is a moderate autumn month in South Yarmouth, Massachusetts, with temperature in the range of an average high of 59.9°F (15.5°C) and an average low of 54.7°F (12.6°C). The transition into October involves a small decrease in the average high-temperature, dipping slightly from a comfortable 67.1°F (19.5°C) in September to a still refreshing 59.9°F (15.5°C). Weather in October »

Weather in November

November, the last month of the autumn in South Yarmouth, is also a fresh month, with an average temperature ranging between max 51.3°F (10.7°C) and min 45.1°F (7.3°C). A mild drop in South Yarmouth's average high-temperature is observed in November, transitioning from a moderate 59.9°F (15.5°C) in October to a cool 51.3°F (10.7°C). Weather in November »

Weather in December

December, the first month of the winter in South Yarmouth, is still a chilly month, with temperature in the range of an average low of 36.9°F (2.7°C) and an average high of 43.7°F (6.5°C). December signals a slight drop in average high-temperature, sliding from November's cool 51.3°F (10.7°C) to a frosty 43.7°F (6.5°C). Weather in December »
Updated: Feb 12, 2024 | Published by: Weather U.S. | Resources

Frequently asked questions

What is the coldest time of year in South Yarmouth?

The coldest time of the year is January, with temperatures averaging a high of 38.5°F (3.6°C) and a low of 30.6°F (-0.8°C).

How many days does it rain in South Yarmouth?

In South Yarmouth, during the entire year, the rain falls for 129 days and collects up to 14.21" (361mm) of precipitation.

When does it snow in South Yarmouth?

Months with snowfall are January through April and December.

What is the snowiest month in South Yarmouth?

The month with the most snowfall in South Yarmouth, Massachusetts, is January, when snow falls for 6.4 days and typically aggregates up to 0.87" (22mm) of snow.

How much does it snow in South Yarmouth?

Throughout the year, in South Yarmouth, there are 20.8 snowfall days, and 2.6" (66mm) of snow is accumulated.

What is the month with the lowest UV index in South Yarmouth?

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

What are the months with the least sunshine in South Yarmouth?

The months with the least sunshine in South Yarmouth are February and December, with an average of 4.6h of sunshine.

What month is the ocean coldest in South Yarmouth?

March is the month with the coldest seawater, with an average ocean temperature of 39°F (3.9°C).

When is Daylight Saving Time (DST) in South Yarmouth?

On Sunday, March 10. 2024, at 2:00 am, Daylight Saving Time starts in South Yarmouth, Massachusetts, 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 South Yarmouth?

May through November are months without snowfall in South Yarmouth, Massachusetts.

What are the most humid months in South Yarmouth?

June and July, with an average relative humidity of 84%, are most humid months in South Yarmouth, Massachusetts.

When are the longest days in South Yarmouth?

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

When is the highest UV index in South Yarmouth?

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

What part of the year is the hottest in South Yarmouth?

The warmest month is August, with an average high-temperature of 72.1°F (22.3°C) and an average low-temperature of 68.5°F (20.3°C).

What is the driest month in South Yarmouth?

August is the month with the least rainfall in South Yarmouth. Rain falls for 11.2 days and accumulates 0.94" (24mm) of precipitation.

When is the ocean warmest in South Yarmouth?

August is the month with the warmest seawater in South Yarmouth, Massachusetts, with an average ocean temperature of 67.5°F (19.7°C).

What month has the most sunshine in South Yarmouth?

With an average of 10.8h of sunshine, August has the most sunshine of the year in South Yarmouth, Massachusetts.

What is the rainiest month in South Yarmouth?

October is the month with the most rainfall in South Yarmouth, Massachusetts. Rain falls for 11.6 days and accumulates 1.93" (49mm) of precipitation.

What is the least humid month in South Yarmouth?

November is the least humid month, with an average relative humidity of 74%.

What is the month with the shortest days in South Yarmouth?

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

Average temperature
South Yarmouth, MA

Average temperature - South Yarmouth, MA

The warmest month (with the highest average high temperature) is August (72.1°F).
The month with the lowest average high temperature is January (38.5°F).

The month with the highest average low temperature is August (68.5°F).
The coldest month (with the lowest average low temperature) is January (30.6°F).

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Average pressure
South Yarmouth, MA

Average pressure - South Yarmouth, 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).

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Average wind speed
South Yarmouth, MA

Average wind speed - South Yarmouth, MA

The windiest month (with the highest average wind speed) is January (16.8mph).
The calmest months (with the lowest average wind speed) are July and August (10.9mph).

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Average humidity
South Yarmouth, MA

Average humidity - South Yarmouth, MA

The months with the highest relative humidity are June and July (84%).
The month with the lowest relative humidity is November (74%).

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Average rainfall
South Yarmouth, MA

Average rainfall - South Yarmouth, MA

The wettest month (with the highest rainfall) is October (1.93").
The driest month (with the least rainfall) is August (0.94").

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Average rainfall days
South Yarmouth, MA

Average rainfall days - South Yarmouth, MA

The month with the highest number of rainy days is May (12.5 days).
The month with the least rainy days is February (8.3 days).

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Average snowfall
South Yarmouth, MA

Average snowfall - South Yarmouth, MA

The month with the highest snowfall is January (0.87").
The months with the least snowfall are May, June, July, August, September, October and November (0").

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Average snowfall days
South Yarmouth, MA

Average snowfall days - South Yarmouth, MA

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

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Average sea temperature
South Yarmouth, MA

Average sea temperature - South Yarmouth, MA

The best month for swimming (with the highest average sea temperature) is August (67.5°F).
The coldest month (with the lowest average sea temperature) is March (39°F).

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Average daylight / Average sunshine
South Yarmouth, MA

Average daylight / Average sunshine - South Yarmouth, 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 48min).
The months with the least sunshine are February and December (Average sunshine: 4h and 36min).

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Average sunshine days
South Yarmouth, MA

Average sunshine days - South Yarmouth, MA

The month with the most sunshine days is September (18.6 days).
The month with the least sunshine days is February (14.3 days).

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Average UV index
South Yarmouth, MA

Average UV index - South Yarmouth, 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).

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Average visibility
South Yarmouth, MA

Average visibility - South Yarmouth, 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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South Yarmouth, Massachusetts, USA

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