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

Bar Harbor registers the highest average temperatures during the month of August, with peaks of 73.4°F (23°C) and lows of 57.7°F (14.3°C).

Humidity

The average relative humidity in August is 80%.

Rainfall

In Bar Harbor, during August, the rain falls for 10.4 days and regularly aggregates up to 1.73" (44mm) of precipitation. In Bar Harbor, Maine, 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.

Ocean temperature

With an average ocean temperature of 56.8°F (13.8°C), August is the month with the warmest seawater.
Note: Immersing oneself in 56.8°F (13.8°C) at sub14°F (-10°C) temperatures is a recipe for harsh cold shock and quickened breathing unless adequately equipped.

Daylight

In August, the average length of the day 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, sunrise is at 5:55 am and sunset at 7:10 pm EDT.

Sunshine

The month with the most sunshine is August, with an average of 10.1h of sunshine.

UV index

The months with the highest UV index are June through August, with an average maximum UV index of 5. A UV Index value of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to UV radiation for average individuals.
Note: In August, a daily UV index of 5 turns into the following recommendations:
Exercise prevention - Protecting skin and eyes from harm is required. Around midday, solar radiation is most harmful; hence, exposure should be limited. Opt for tightly woven and loose clothing to enhance protection from the Sun.
Updated: Jun 4, 2024 | Published by: Weather Atlas | About Us | Weather Forecasting | Data Sources

Frequently asked questions

What is the hottest time of year?

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

What is the average August temperature?

In August, in Bar Harbor, the average high-temperature is 73.4°F (23°C), and the average low-temperature is 57.7°F (14.3°C).

What is the average humidity in August?

In August, the average relative humidity is 80%.

How much does it rain in August?

In Bar Harbor, during August, the rain falls for 10.4 days and regularly aggregates up to 1.73" (44mm) of precipitation.

When it does not snow?

In Bar Harbor, snow does not fall in June through September.

What is the month with the warmest ocean?

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

What is the ocean temperature in August?

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

When is the sunrise / sunset in August?

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, sunrise is at 5:55 am and sunset at 7:10 pm EDT.

What month has the most sunshine?

The month with the most sunshine in Bar Harbor, Maine, is August, with an average of 10.1h of sunshine.

How many hours of sunshine does Bar Harbor have in August?

In August, the average sunshine duration is 10.1h.

When is the highest UV index?

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

What is the UV index reading in August?

The average daily maximum UV index in August is 5. A UV Index estimate of 3 to 5 represents a medium hazard to health from unprotected exposure to UV radiation.
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).

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).

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).

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%).

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").

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).

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").

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).

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).

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).

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).

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).

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).

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).

Bar Harbor, Maine, USA

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