Climate and monthly weather forecast
Harpswell, ME


The climate of Harpswell

Harpswell, located in Maine, USA, experiences a humid continental climate with no dry season and warm summers, as characterized by the Köppen climate classification system, Dfb.
Throughout the twelve months, the climatic conditions vary notably. Consequently, Harpswell observes a range of weather states.

Analyzing the average sea temperature data, a minimum of 37.9°F (3.3°C) is recorded in March, whereas a maximum of 62.2°F (16.8°C) occurs in July. Observing, daylight hours they seem to follow a regular cyclical pattern, with the shortest day length of 9 hours registered in December and the longest daylight of 15.4 hours in June.

The analysis of these parameters shows that Harpswell's climate isn't constant throughout the year but varies seasonally. Still, some months are prone to certain extreme weather conditions, such as the coldest sea temperatures in March and the longest days in June.

The best time to visit Harpswell

With pleasant weather and long days, the best time to visit Harpswell would arguably be June. During this time, the daylight hours reach their peak length, providing ample daylight for sightseeing and various activities. Meanwhile, the sea temperature is steadily rising, reaching a comfortable 53.5°F (11.9°C), which enables a variety of water-based exercises.

The worst time to visit Harpswell

Traveling to Harpswell might be less enjoyable during March due to the harshest sea temperatures of the year. The sea temperature dips to its annual low of 37.9°F (3.3°C), discouraging any ocean activities. Furthermore, the daylight hours are also less generous than the other months, with an average of 12 hours per day.

Spring weather in Harpswell

Spring in Harpswell sees a gradual increase in the sea temperature, warming from 37.9°F (3.3°C) in March to 45.9°F (7.7°C) in May. Concurrently, daylight hours extend throughout this period, increasing from 12 to 14.7 hours. Spring is characterized by these transitioning weather states, leading to a mixed bag of conditions that herald the onset of warmer months.

Summer weather in Harpswell

Summers in Harpswell are marked by a visible increase in both sea temperature and daylight hours. The sea temperature escalates from June's 53.5°F (11.9°C), reaching its peak at 62.2°F (16.8°C) in July, then slightly dropping to 59.7°F (15.4°C) in August. Daylight hours during summer remain generous, from 15.4 hours in June, slightly decreasing to 13.9 hours in August. Summer in Harpswell offers the warmest sea temperatures and maximum daylight for an enriched experience.

Autumn weather in Harpswell

Autumn in Harpswell signifies a downturn in weather conditions, as the sea temperature begins to fall after the warm summer months, from 54.8°F (12.7°C) in September to 45.4°F (7.4°C) in November. Meanwhile, daylight hours shorten during this period Decreasing from 11 hours to 9 hours. Despite this, Autumn offers some unique scenics as the color change in foliage provides a captivating landscape.

Winter weather in Harpswell

Winter in Harpswell welcomes the coldest sea temperatures of the year, starting from 41.3°F (5.2°C) in December, dipping further to 38.4°F (3.6°C) in February. Daylight hours attain their minimum during winter, averaging 9.4 hours in December and 9 hours in January. The chilly sea temperatures and limited daylight make it the coldest time of the year.

Weather in January

Existing in the dead of winter, January brings the chilliest sea temperatures to Harpswell, Maine, with the surface water dipping to an average of 41.3°F (5.2°C). The frosty weather rings in the new year, setting the scene for generally overcast skies and glimmering frost-covered landscapes. Weather in January »

Weather in February

Navigating through February, the weather in Harpswell, Maine, continues its wintry narrative with sea temperatures dropping even further to an average of 38.4°F (3.6°C). The weather scenario remains largely unchanged from January, maintaining its charm with crystalline snow covering the landscapes and overcast skies. Weather in February »

Weather in March

Transitioning into March, the weather in Harpswell, Maine, remains steady, with the frigid sea conditions enduring despite a slight rise in temperature to 37.9°F (3.3°C). The continuous blanket of cold weather begins to gradually loosen, foreshadowing the gradual warming trend as Maine leaves winter behind and embraces the renewal birthed by spring. Weather in March »

Weather in April

Moving steadily into spring, April in Harpswell, Maine, heralds an increase in sea temperatures soaring up to an average of 41.3°F (5.2°C). The arrival of this month brings renewed vitality to the region in comparison to the preceding March, showcasing an appreciable enhancement in warmth and daylight hours. Weather in April »

Weather in May

Welcoming summer's prelude, the month of May in Harpswell, Maine, experiences a significant leap in sea temperatures, reaching an average of 45.9°F (7.7°C). The shift further away from the cold of March is quite perceptible, with longer daylight hours contributing to warmer days. Weather in May »

Weather in June

June in Harpswell, Maine, celebrates the official commencement of summer, exhibiting a remarkable jump in sea temperatures to a comfortable 53.5°F (11.9°C). The noticeable transition from May's warming influence amplifies the inviting conditions of summer, rendering the landscapes lush and ocean thriving. Weather in June »

Weather in July

Peaking into the heart of summer, the month of July in Harpswell, Maine, witnesses the warmest sea temperatures of the year, climbing up to an average of 60°F (15.6°C). This warm weather marks a definitive departure from the milder pool of June, introducing balmy days and soothing sea breezes. Weather in July »

Weather in August

August weather in Harpswell, Maine, continues the summer trend with sea temperatures slightly increased to an average of 62.2°F (16.8°C). Comparatively, this month maintains the glorious warmth of July, providing residents and visitors alike with more beautiful summer days filled with an array of outdoor activities. Weather in August »

Weather in September

Introducing autumn, the weather in Harpswell, Maine, in September experiences a drop in sea temperatures to an average of 59.7°F (15.4°C). Compared to the balmy August, September prefaces a seasonal variation that ushers in the charm of fall. Weather in September »

Weather in October

October in Harpswell, Maine, continues the autumn narrative, presenting a further reduction in sea temperatures to an average of 54.8°F (12.7°C). Similar to September, October creates a cool and comfortable setting, distinguishing it from the preceding summer months. Weather in October »

Weather in November

November in Harpswell, Maine, precipitates the onset of winter, further lowering the average sea temperatures to 49.5°F (9.7°C). The transition from mild October to a chillier November is apparent, as the fall leaves make way for possible early snowfalls. Weather in November »

Weather in December

Embracing winter in full spectrum, December in Harpswell, Maine, reflects the cold wave across the region, with the sea temperatures dropping to an average of 45.4°F (7.4°C). The cooling divergence from November brings a predominantly chilly weather scenario, reinstating the winter wonderland appeal seen at the beginning of the year. Weather in December »

Frequently asked questions

What is the month with the coldest ocean in Harpswell?

The month with the coldest seawater in Harpswell, Maine, is March, with an average ocean temperature of 37.9°F (3.3°C).

When is Daylight Saving Time (DST) in Harpswell?

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 are the longest days in Harpswell?

The month with the longest days in Harpswell, Maine, is June, with an average of 15h and 24min of daylight.

What is the month with the warmest ocean in Harpswell?

The month with the warmest seawater in Harpswell, Maine, is August, with an average ocean temperature of 62.2°F (16.8°C).

What is the month with the shortest days in Harpswell?

The month with the shortest days in Harpswell, Maine, is December, with an average of 9h and 0min of daylight.

Average sea temperature
Harpswell, ME

Average sea temperature - Harpswell, ME

The best month for swimming (with the highest average sea temperature) is August (62.2°F).
The coldest month (with the lowest average sea temperature) is March (37.9°F).


Average daylight
Harpswell, ME

Average daylight - Harpswell, ME

The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 9h and 0min).


Harpswell, Maine, USA

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