August weather forecast
Bar Harbor, ME

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The popular tourist spot of Bar Harbor in Maine, within the Mount Desert Island
The popular tourist spot of Bar Harbor in Maine, within the Mount Desert Island

Weather in August

August continues the trend of balmy days, similar to July. The weather stays relatively hot, with temperatures reaching peaks similar to July's. It is the last full month of summer, allowing ample opportunity for tourists to enjoy the warm weather and sea pursuits. As the sun sets on August, the season starts showing signs of transition towards autumn. Preparations for fall activities begin nearing the end of this month.

Temperature

August proves to be the warmest month, recording an average peak temperature of 73.4°F (23°C) and a minimum temperature of 57.7°F (14.3°C).

Humidity

In August, the average relative humidity is 80%.

Rainfall

In August, the rain falls for 10.4 days. Throughout August, 1.73" (44mm) of precipitation is accumulated. In Bar Harbor, during the entire year, the rain falls for 142.1 days and collects up to 32.28" (820mm) of precipitation.

Snowfall

June through September are months without snowfall in Bar Harbor.

Ocean temperature

The month with the warmest seawater is August, with an average ocean temperature of 56.8°F (13.8°C).
Note: Dipping into 56.8°F (13.8°C) below 50°F (10°C) needs protective wear, or you'd face cold shock and breathing issues swiftly. Meanwhile, a slight swim around 55.4°F (13°C) feels cold to the bone.

Daylight

The average length of the day in August is 13h and 59min.
On the first day of the month, sunrise is at 5:20 am and sunset at 7:57 pm. On the last day of August, in Bar Harbor, sunrise is at 5:55 am and sunset at 7:10 pm EDT.

Sunshine

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

UV index

June through August, with an average maximum UV index of 5, are months with the highest UV index. A UV Index estimate of 3 to 5 represents a moderate health risk from unprotected exposure to Sun's UV rays for the ordinary person.
Note: A daily high UV index of 5 in August leads to these guidelines:
Heed the precautions - Suggestions to avoid sunburn are made. The Sun is most powerful around mid-day, so it's a good practice to reduce direct exposure. Always opt for UVA and UVB-resistant sunglasses on radiant days.
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Frequently asked questions

What is the hottest time of year in Bar Harbor?

In Bar Harbor, the average temperatures in August are the highest, with a peak at 73.4°F (23°C) and a low of 57.7°F (14.3°C).

What is the usual temperature for Bar Harbor in August?

The average high-temperature and low-temperature in Bar Harbor during August are 73.4°F (23°C) and 57.7°F (14.3°C) respectively.

What is the average humidity in August in Bar Harbor?

In August, the average relative humidity in Bar Harbor is 80%.

How much does it rain in Bar Harbor in August?

In Bar Harbor, in August, during 10.4 rainfall days, 1.73" (44mm) of precipitation is typically accumulated.

When it does not snow in Bar Harbor?

June through September are months without snowfall in Bar Harbor.

What is the month with the warmest ocean in Bar Harbor?

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

What is the ocean temperature in August in Bar Harbor?

In Bar Harbor, Maine, the average seawater temperature in August is 56.8°F (13.8°C). Swimming in 56.8°F (13.8°C) is considered dangerous. Unprotected immersion in temperatures below 50°F (10°C) causes quickly maximum intensity cold shock with hyperventilation.

What is the average length of the day in August in Bar Harbor?

In Bar Harbor, Maine, the average day length in August is 13h and 59min.

When is the sunrise / sunset in August in Bar Harbor?

In August, on the first day of the month, sunrise is at 5:20 am and sunset at 7:57 pm. On the last day of the month, in Bar Harbor, sunrise is at 5:55 am and sunset at 7:10 pm EDT.

What month has the most sunshine in Bar Harbor?

August has the most sunshine of the year in Bar Harbor, Maine, with an average of 10.1h of sunshine.

How long on average sun shines in August in Bar Harbor?

In Bar Harbor, Maine, the average sunshine duration in August is 10.1h.

What is the month with the highest UV index in Bar Harbor?

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

What is the UV index reading in August in Bar Harbor?

The average daily maximum UV index in August is 5. A UV Index value of 3 to 5 symbolizes a moderate health threat from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in August
Bar Harbor, ME

Average temperature in August - Bar Harbor, ME
  • Average high temperature in August: 73.4°F

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).

  • Average low temperature in August: 57.7°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).

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Average pressure in August
Bar Harbor, ME

Average pressure in August - Bar Harbor, ME
  • Average pressure in August: 29.96"Hg

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

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Average wind speed in August
Bar Harbor, ME

Average wind speed in August - Bar Harbor, ME
  • Average wind speed in August: 6.3mph

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).

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Average humidity in August
Bar Harbor, ME

Average humidity in August - Bar Harbor, ME
  • Average humidity in August: 80%

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

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Average rainfall in August
Bar Harbor, ME

Average rainfall in August - Bar Harbor, ME
  • Average rainfall in August: 1.73"

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

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Average rainfall days in August
Bar Harbor, ME

Average rainfall days in August - Bar Harbor, ME
  • Average rainfall days in August: 10.4 days

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).

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Average snowfall in August
Bar Harbor, ME

Average snowfall in August - Bar Harbor, ME
  • Average snowfall in August: 0"

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

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Average snowfall days in August
Bar Harbor, ME

Average snowfall days in August - Bar Harbor, ME
  • Average snowfall days in August: 0 days

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).

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Average sea temperature in August
Bar Harbor, ME

Average sea temperature in August - Bar Harbor, ME
  • Average sea temperature in August: 56.8°F

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 (38.6°F).

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Average daylight in August /
Average sunshine in August
Bar Harbor, ME

Average daylight in August / Average sunshine in August - Bar Harbor, ME
  • Average daylight in August: 14h and 0min

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).

  • Average sunshine in August: 10h and 1min

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).

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Average sunshine days in August
Bar Harbor, ME

Average sunshine days in August - Bar Harbor, ME
  • Average sunshine days in August: 18.7 days

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

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Average UV index in August
Bar Harbor, ME

Average UV index in August - Bar Harbor, ME
  • Average UV index in August: 5

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).

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Average cloud cover in August
Bar Harbor, ME

Average cloud cover in August - Bar Harbor, ME
  • Average cloud cover in August: 35

The month with the most cloud cover is February (Cloud cover 56).
The months with the least cloud cover are August and September (Cloud cover 35).

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Average visibility in August
Bar Harbor, ME

Average visibility in August - Bar Harbor, ME
  • Average visibility in August: 5mi

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).

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Bar Harbor, Maine, USA

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