Climate and monthly weather forecast
Weymouth, MA

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The modern bridge crossing on the large Fore River passing through Weymouth City, Massachusetts
The modern bridge crossing on the large Fore River passing through Weymouth City, Massachusetts

The climate of Weymouth

With a geographical position on the northeastern coast of the United States, Weymouth, Massachusetts enjoys a moderate four-season weather cycle. It falls within the Cfa zone of the Köppen climate classification, characterized by a humid subtropical climate with no dry season.

Annual average temperatures deviate significantly between seasons, presenting the typical fluctuations associated with a four-season climate. High temperatures range from 34.5°F (1.4°C) in January to 79.3°F (26.3°C) in July, while low temperatures vary from 24.3°F (-4.3°C) in January to 64.9°F (18.3°C) in July. Throughout the year, the area experiences relative humidity levels between 72 to 77%.

The most rainfall occurs in April with 3.07" (78mm), while the least is in August with 1.77" (45mm). The number of rainy days per month can go up to 16.5 in July, and down to 8.6 in January. Snowfall periods span from December to March, reaching highs of 3.86" (98mm) in February and going down to zero by April.

The daylight exposure extends to a maximum of 15.2 hours in June and contracts to a minimum of 9.2 hours in December. Despite the changes in daylight hours, the cloud coverage remains relatively consistent throughout the year, shifting around 30 to 51% on an average. Weymouth reports a mild sunlight exposure, with the highest sunshine duration recorded in August with 10.6 hours and the lowest in December with 4.8 hours.

The best time to visit Weymouth

Bearing in mind the impact of climate on comfort and activities, visiting Weymouth between June and September proves to be enjoyable. During these months, the high temperatures range from 63.9°F (17.7°C) to 79.3°F (26.3°C) and rainfall levels are relatively low, with August experiencing only 1.77" (45mm) of rainfall. The longer daylight hours paired with the extended sunshine duration offer ample opportunities for outdoor activities.

The worst time to visit Weymouth

Travelers may want to avoid the winter months of December through February when the weather can be harsh. Low temperatures drop down to 24.3°F (-4.3°C) and high temperatures may only reach up to 37.2°F (2.9°C) while snowfall can reach up to 3.86" (98mm) in February.

Spring weather in Weymouth

Spring, from March to May, shows a noticeable change in temperatures and rainfall. March initiates a rise in temperatures, from high temperatures between 34.5°F (1.4°C) to 43°F (6.1°C), reaching up to 63.9°F (17.7°C) in May. Rainfall peaks in April reaching up to 3.07" (78mm), making it the wettest month in the spring season.

Summer weather in Weymouth

Stretching from June to August, summer in Weymouth rings in the warmest temperatures, averaging between 71.8°F (22.1°C) to 79.3°F (26.3°C). Despite some rainy spells, the rainfall decreases by August, reaching the lowest annual level of 1.77" (45mm). Days are longest during this season with up to 15.2 hours of daylight in June while the sunshine duration peaks at 10.6 hours in August.

Autumn weather in Weymouth

Autumn in Weymouth, spanning from September to November, brings in a gradual drop in temperatures and an increase in rainfall. High temperatures decrease from 71.4°F (21.9°C) in September to 49.6°F (9.8°C) by November. Rainfall amounts increase especially in October, reaching up to 2.72" (69mm).

Winter weather in Weymouth

Winter, spanning from December to February, brings chilly temperatures and snow in Weymouth. High temperatures can plunge to as low as 34.5°F (1.4°C) in January, paired with the lowest daylight hours of the year, reaching just 9.2 hours in December. During this season, snowfall is common with February witnessing the highest amount of snow, reaching up to 3.86" (98mm).

Weather in January

The beginning of the year in Weymouth, Massachusetts unrolls with noteworthy chilliness, with the high reaching up to 34.5°F (1.4°C) and low plunging down to 24.3°F (-4.3°C). January's frosty presence differs distinctly from the milder climate seen in December. Weather in January »

Weather in February

February carries on the frosty narrative from January, with a slight rise in temperature. February peaks at 37.2°F (2.9°C), while still maintaining a low around 25.3°F (-3.7°C), witnessing a minor relief from January's intense cold. Weather in February »

Weather in March

March brings about a significant transition from the cold to more moderate temperatures, ascending to 43°F (6.1°C) while the low end remains around 31.6°F (-0.2°C). Compared to the preceding February's bitter chills, this month signals a turning point towards spring. Weather in March »

Weather in April

The weather in April further distances itself from winter, ushering in warmer days with temperatures reaching around 53.8°F (12.1°C) at their warmest. The minimum temperature still lingers around a breezy 40.6°F (4.8°C), ensuring a slight nip in the air. Weather in April »

Weather in May

As the fifth month of the year, May presents a pleasant embrace of warmth, with maximum temperatures soaring to 63.9°F (17.7°C). Markedly warmer than April, the climate in May retains a cozy minimum of about 50.2°F (10.1°C). The month unfolds beautifully, showcasing clear skies and considerably less rainfall allowing residents and visitors to bask in the increasing sunlight. Weather in May »

Weather in June

Weymouth experiences noticeably warmer and longer days in June, a significant shift from the mild temperatures witnessed in May. The heat levels continue to climb, augmenting the sense of summer's grip on Weymouth. The presence of sunlight is consistent during this period, inviting locals to enjoy a multitude of outdoor activities. Weather in June »

Weather in July

July is the warmest month in Weymouth, reaching scorching highs of around 79.3°F (26.3°C), and providing exceptionally warm nights with lows around 64.9°F (18.3°C). The heatwave elevates from June, marking July as the high point of summer's dominion over the city. Weather in July »

Weather in August

In August, temperature trends depict a slightly cooler climate than July, albeit still maintaining the marks of summer warmth at 78.4°F (25.8°C). Weymouth witnesses a gradual reduction in daylight hours during this period, signifying the onset of shorter autumn days. Weather in August »

Weather in September

September shows a significant reduction in the heat, with a high of approximately 71.4°F (21.9°C), gradually leading the summer away and fanning in the soothing airs of fall. Although notably cooler than August, it offers a comfortably warm atmosphere, ripe with the fragrant scent of the autumnal shift. Weather in September »

Weather in October

October in Weymouth sees a more apparent transition into fall, with maximum temperatures retreating to around 60.4°F (15.8°C). October is significantly cooler than the preceding month of September and is outfitted with all the quintessential elements of a typical New England fall. Weather in October »

Weather in November

The course of November unravels further into cool autumn days, dipping down to a low of approximately 39.2°F (4°C). The departure from October's mild weather becomes apparent, with the city preparing to encounter the first threads of winter winds by the close of the month. Weather in November »

Weather in December

December in Weymouth manifests the onset of winter, presenting cold days with a high of 40.3°F (4.6°C), a sharp contrast to the warmer temperatures of November. The landscape is often painted white again with the first significant snowfall gracing the city towards the end of the month. Weather in December »

Frequently asked questions

What is the coldest time of year in Weymouth?

January is the month when Weymouth sees the average lowest temperatures, with a high of 34.5°F (1.4°C) and a low of 24.3°F (-4.3°C).

How much does it rain?

In Weymouth, during the entire year, the rain falls for 152 days and collects up to 29.09" (739mm) of precipitation.

When does it snow?

Months with snowfall are January through April, November and December.

How much does it snow?

Throughout the year, there are 28 snowfall days, and 12.48" (317mm) of snow is accumulated.

When is the lowest UV index?

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

What are the most humid months?

The months with the highest humidity in Weymouth are February, June and September, with an average relative humidity of 77%.

When does it snow the most?

The month with the most snowfall is February, when snow falls for 6.8 days and typically aggregates up to 3.86" (98mm) of snow.

What is the month with the least sunshine?

February and December, with an average of 4.8h of sunshine, are months with the least 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?

The least humid month is April, with an average relative humidity of 72%.

When it does not snow?

May through October are months without snowfall.

When are the longest days?

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

What are the warmest months?

July is the warmest month, exhibiting average temperatures of 79.3°F (26.3°C) at the peak and 64.9°F (18.3°C) at the base.

What are the months with the highest UV index?

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

What month has the most sunshine?

August has the most sunshine of the year, with an average of 10.6h of sunshine.

What is the driest month?

The month with the least rainfall in Weymouth is September, when the rain falls for 11.7 days and typically collects 1.5" (38mm) of precipitation.

What is the rainiest month?

December is the month with the most rainfall. Rain falls for 11.5 days and accumulates 3.11" (79mm) of precipitation.

What is the month with the shortest days?

The month with the shortest days is December, with an average of 9h and 12min of daylight.

Average temperature
Weymouth, MA

Average temperature - Weymouth, MA

The warmest month (with the highest average high temperature) is July (79.3°F).
The month with the lowest average high temperature is January (34.5°F).

The month with the highest average low temperature is July (64.9°F).
The coldest month (with the lowest average low temperature) is January (24.3°F).

Average pressure
Weymouth, MA

Average pressure - Weymouth, 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
Weymouth, MA

Average wind speed - Weymouth, MA

The windiest month (with the highest average wind speed) is January (11.1mph).
The calmest month (with the lowest average wind speed) is August (6.9mph).

Average humidity
Weymouth, MA

Average humidity - Weymouth, MA

The months with the highest relative humidity are February, June and September (77%).
The month with the lowest relative humidity is April (72%).

Average rainfall
Weymouth, MA

Average rainfall - Weymouth, MA

The wettest month (with the highest rainfall) is December (3.11").
The driest month (with the least rainfall) is September (1.5").

Average rainfall days
Weymouth, MA

Average rainfall days - Weymouth, MA

The month with the highest number of rainy days is July (16.5 days).
The month with the least rainy days is January (8.6 days).

Average snowfall
Weymouth, MA

Average snowfall - Weymouth, MA

The month with the highest snowfall is February (3.86").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days
Weymouth, MA

Average snowfall days - Weymouth, MA

The month with the highest number of snowfall days is January (8 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

Average daylight / Average sunshine
Weymouth, MA

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

Average sunshine days
Weymouth, MA

Average sunshine days - Weymouth, MA

The month with the most sunshine days is November (17 days).
The month with the least sunshine days is July (12.8 days).

Average UV index
Weymouth, MA

Average UV index - Weymouth, 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
Weymouth, MA

Average visibility - Weymouth, 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).

Weymouth, Massachusetts, USA

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