Climate and monthly weather forecast
Sullivan, ME

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Weather in January

January, the same as December, in Sullivan, Maine, is another subzero cold winter month, with temperature in the range of an average high of 29.7°F (-1.3°C) and an average low of 18.5°F (-7.5°C). January is the coldest month, exhibiting average temperatures of 29.7°F (-1.3°C) at the peak and 18.5°F (-7.5°C) at the base. Weather in January »

Weather in February

February, the last month of the winter in Sullivan, is also a subzero cold month, with an average temperature fluctuating between 30.7°F (-0.7°C) and 18.9°F (-7.3°C). On the advent of February, Sullivan's average high-temperature exhibits a minor adjustment to a still subzero cold 30.7°F (-0.7°C) from January's 29.7°F (-1.3°C). Weather in February »

Weather in March

The first month of the spring, March, is a wintry month in Sullivan, Maine, with an average temperature ranging between max 37.2°F (2.9°C) and min 25.9°F (-3.4°C). March's arrival sees a mild rise in the average high-temperature, transitioning from February's freezing cold 30.7°F (-0.7°C) to a cold 37.2°F (2.9°C). Weather in March »

Weather in April

April in Sullivan, Maine, is a frosty spring month, with an average temperature varying between 48.6°F (9.2°C) and 35.6°F (2°C). April sees a rise in the average high-temperature, climbing from a cold 37.2°F (2.9°C) in March to a frosty 48.6°F (9.2°C). Weather in April »

Weather in May

The last month of the spring, May, is a moderate month in Sullivan, Maine, with an average temperature ranging between max 58.6°F (14.8°C) and min 44.2°F (6.8°C). May's arrival is marked by an increase in the average high-temperature, moving from a chilly 48.6°F (9.2°C) in April to a mild 58.6°F (14.8°C). Weather in May »

Weather in June

June, the first month of the summer in Sullivan, is a refreshing month, with an average temperature fluctuating between 51.4°F (10.8°C) and 66°F (18.9°C). In Sullivan, the average high-temperature in June slightly increases from a refreshing 58.6°F (14.8°C) in May to a comfortable 66°F (18.9°C). Weather in June »

Weather in July

July is a pleasant summer month in Sullivan, Maine, with an average temperature fluctuating between 73.2°F (22.9°C) and 58.1°F (14.5°C). A subtle rise in the average high-temperature is observed during July, adjusting from an enjoyable 66°F (18.9°C) in June to a pleasant 73.2°F (22.9°C). Weather in July »

Weather in August

August, the last month of the summer in Sullivan, is a warm month, with temperature in the range of an average high of 73.4°F (23°C) and an average low of 57.7°F (14.3°C). August temperatures tend to peak at an average high of 73.4°F (23°C) and dip to a low of 57.7°F (14.3°C). Weather in August »

Weather in September

The first month of the autumn, September, is still a comfortable month in Sullivan, Maine, with an average temperature varying between 67.1°F (19.5°C) and 52.7°F (11.5°C). The advent of September brings a subtle shift in temperature, with the average high moving from a moderately hot 73.4°F (23°C) in August to an enjoyable 67.1°F (19.5°C). Weather in September »

Weather in October

October, the same as September, in Sullivan, Maine, is another mild autumn month, with an average temperature varying between 45°F (7.2°C) and 55.9°F (13.3°C). In Sullivan, the beginning of October is marked by a lowered average high-temperature, shifting from September's enjoyable 67.1°F (19.5°C) to a still refreshing 55.9°F (13.3°C). Weather in October »

Weather in November

The last month of the autumn, November, is also a frosty month in Sullivan, Maine, with an average temperature fluctuating between 34.7°F (1.5°C) and 44.8°F (7.1°C). November brings a drop in Sullivan's average high-temperature, falling from a refreshing 55.9°F (13.3°C) in October to a frosty 44.8°F (7.1°C). Weather in November »

Weather in December

The first month of the winter, December, is also an icy month in Sullivan, Maine, with an average temperature ranging between max 35.1°F (1.7°C) and min 25.7°F (-3.5°C). December shows a mild decline in the average high-temperature, falling from November's chilly 44.8°F (7.1°C) to a cold 35.1°F (1.7°C). Weather in December »
Updated: Feb 12, 2024 | Published by: Weather U.S. | About Us / Weather Forecasting / Data Sources

Frequently asked questions

What month is the coldest in Sullivan?

The coldest period tends to be January, when average temperatures fluctuate between a high of 29.7°F (-1.3°C) and a low of 18.5°F (-7.5°C).

How much does it rain in Sullivan?

In Sullivan, Maine, during the entire year, the rain falls for 142.1 days and collects up to 32.28" (820mm) of precipitation.

When does it snow in Sullivan?

Months with snowfall are January through May, October through December.

How many days does it snow in Sullivan?

In Sullivan, Maine, during the entire year, snow falls for 48.1 days and aggregates up to 23.82" (605mm) of snow.

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

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

What is the most humid month in Sullivan?

The most humid month in Sullivan, Maine, is February, with an average relative humidity of 83%.

What is the snowiest month in Sullivan?

February is the month with the most snowfall in Sullivan, Maine. Snow falls for 11.4 days and accumulates 5.75" (146mm) of snow.

What is the month with the least sunshine in Sullivan?

With an average of 4.1h of sunshine, February has the least sunshine of the year.

When is the ocean coldest in Sullivan?

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

When is Daylight Saving Time (DST) in Sullivan?

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 Sullivan?

In Sullivan, Maine, snow does not fall in June through September.

When are the longest days in Sullivan?

With an average of 15h and 30min of daylight, June has the longest days of the year in Sullivan.

What is the month with the highest UV index in Sullivan?

June through August, with an average maximum UV index of 5, are months with the highest UV index.

What is the driest month in Sullivan?

July is the month with the least rainfall in Sullivan. Rain falls for 13 days and accumulates 1.57" (40mm) of precipitation.

What is the hottest time of year in Sullivan?

In Sullivan, August is the warmest month, with temperatures averaging a high of 73.4°F (23°C) and a low of 57.7°F (14.3°C).

When is the ocean warmest in Sullivan?

With an average ocean temperature of 56.8°F (13.8°C), August is the month with the warmest seawater in Sullivan.

What month has the most sunshine in Sullivan?

With an average of 10.1h of sunshine, August has the most sunshine of the year.

What is the least humid month in Sullivan?

November is the least humid month in Sullivan, with an average relative humidity of 76%.

What is the wettest month in Sullivan?

The month with the most rainfall in Sullivan is December, when the rain falls for 11.5 days and typically aggregates up to 3.94" (100mm) of precipitation.

What is the month with the shortest days in Sullivan?

With an average of 8h and 54min of daylight, December has the shortest days of the year.

Average temperature
Sullivan, ME

Average temperature - Sullivan, ME

The warmest month (with the highest average high temperature) is August (73.4°F).
The month with the lowest average high temperature is January (29.7°F).

The month with the highest average low temperature is July (58.1°F).
The coldest month (with the lowest average low temperature) is January (18.5°F).

Average pressure
Sullivan, ME

Average pressure - Sullivan, ME

The month with the highest atmospheric pressure is September (30.04"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).

Average wind speed
Sullivan, ME

Average wind speed - Sullivan, ME

The windiest month (with the highest average wind speed) is January (10.4mph).
The calmest months (with the lowest average wind speed) are July and August (6.3mph).

Average humidity
Sullivan, ME

Average humidity - Sullivan, ME

The month with the highest relative humidity is February (83%).
The month with the lowest relative humidity is November (76%).

Average rainfall
Sullivan, ME

Average rainfall - Sullivan, ME

The wettest month (with the highest rainfall) is December (3.94").
The driest month (with the least rainfall) is July (1.57").

Average rainfall days
Sullivan, ME

Average rainfall days - Sullivan, ME

The month with the highest number of rainy days is April (15.5 days).
The month with the least rainy days is February (7.5 days).

Average snowfall
Sullivan, ME

Average snowfall - Sullivan, ME

The month with the highest snowfall is February (5.75").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days
Sullivan, ME

Average snowfall days - Sullivan, ME

The month with the highest number of snowfall days is January (11.8 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average sea temperature
Sullivan, ME

Average sea temperature - Sullivan, ME

The best month for swimming (with the highest average sea temperature) is August (56.8°F).
The coldest month (with the lowest average sea temperature) is March (38°F).

Average daylight / Average sunshine
Sullivan, ME

Average daylight / Average sunshine - Sullivan, ME

The month with the longest days is June (Average daylight: 15h and 30min).
The month with the shortest days is December (Average daylight: 8h and 54min).

The month with the most sunshine is August (Average sunshine: 10h and 6min).
The month with the least sunshine is February (Average sunshine: 4h and 6min).

Average sunshine days
Sullivan, ME

Average sunshine days - Sullivan, ME

The month with the most sunshine days is August (18.7 days).
The month with the least sunshine days is April (11.2 days).

Average UV index
Sullivan, ME

Average UV index - Sullivan, ME

The months with the highest UV index are June, July and August (UV index 5).
The months with the lowest UV index are January, February, March, November and December (UV index 2).

Average visibility
Sullivan, ME

Average visibility - Sullivan, ME

The months with the highest visibility are January, February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are July and August (5mi).

Sullivan, Maine, USA

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