August weather forecast
Belfast, ME

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Weather in August

As summer's end draws near in Belfast, August brings slight changes in the weather conditions. Unlike July, average temperatures tend to take a slight dip, indicating autumn's impending arrival. Interestingly, snowfall remains non-existent, maintaining the norm of a snow-free summer season. Outdoor activities continue to dominate the local scene, with ample sunshine hours encouraging locals and visitors alike to enjoy the outdoors. August is seen as a transitional period, saying goodbye to summer and welcoming the refreshing start of autumn.

Temperature

The warmest period falls in July and August, when the average high-temperature reaches 73.9°F (23.3°C).

Humidity

In Belfast, the average relative humidity in August is 82%.

Rainfall

In Belfast, Maine, during August, the rain falls for 13 days and regularly aggregates up to 1.85" (47mm) of precipitation. In Belfast, during the entire year, the rain falls for 141.1 days and collects up to 24.29" (617mm) of precipitation.

Snowfall

June through September are months without snowfall.

Ocean temperature

With an average ocean temperature of 60.4°F (15.8°C), August is the month with the warmest seawater.
Note: A majority do not enjoy swimming in water at 60.4°F (15.8°C). The difficulty in controlling breathing increases progressively as the temperature dips below 69.8°F (21°C).

Daylight

In Belfast, the average length of the day in August is 13h and 59min.
On the first day of August, sunrise is at 5:23 am and sunset at 8:00 pm. On the last day of the month, sunrise is at 5:58 am and sunset at 7:13 pm EDT.

Sunshine

The month with the most sunshine is August, with an average of 9.9h of sunshine.

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 medium vulnerability from exposure to the Sun's UV rays for the average person.
Note: In August, the maximum UV index of 5 suggests this advice:
Ensure safety - Imperative it is to shield skin and eyes from damage. Sun exposure should be minimized, especially during midday, to avoid harmful UV radiation. To mitigate harm from sun exposure, pick sunglasses offering UVA and UVB defense.
Updated: Jun 25, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are the warmest months?

Belfast's warmest season falls during July and August, averaging a high-temperature of 73.9°F (23.3°C).

What is the usual temperature for Belfast in August?

In August, in Belfast, the average high-temperature is 73.9°F (23.3°C), and the average low-temperature is 56.8°F (13.8°C).

What is the average humidity in August?

The average relative humidity in August is 82%.

How much does it rain in August?

In Belfast, Maine, in August, during 13 rainfall days, 1.85" (47mm) of precipitation is typically accumulated.

When it does not snow?

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

What is the month with the warmest ocean in Belfast?

The month with the warmest seawater is August, with an average ocean temperature of 60.4°F (15.8°C).

What is the ocean temperature in August?

In Belfast, in August, the average water temperature is 60.4°F (15.8°C). Swimming in 60.4°F (15.8°C) is not enjoyable for the majority. Controlling breathing becomes progressively more difficult as surface water temperature decreases below 69.8°F (21°C).

How many hours of daylight does Belfast have in August?

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

What time are sunrise and sunset in August?

On the first day of August, sunrise is at 5:23 am and sunset at 8:00 pm. On the last day of the month, sunrise is at 5:58 am and sunset at 7:13 pm EDT.

What month has the most sunshine?

August has the most sunshine of the year, with an average of 9.9h of sunshine.

How many hours of sunshine does Belfast have in August?

In August, the average sunshine duration is 9.9h.

What is the month with the highest UV index?

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

How high is the UV index in August?

The average daily maximum UV index in August is 5. A UV Index of 3 to 5 symbolizes a medium hazard to health from 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
Belfast, ME

Average temperature in August - Belfast, ME
  • Average high temperature in August: 73.9°F

The warmest months (with the highest average high temperature) are July and August (73.9°F).
The month with the lowest average high temperature is January (28.4°F).

  • Average low temperature in August: 56.8°F

The month with the highest average low temperature is July (57.7°F).
The coldest month (with the lowest average low temperature) is January (16.2°F).

Average pressure in August
Belfast, ME

Average pressure in August - Belfast, 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
Belfast, ME

Average wind speed in August - Belfast, ME
  • Average wind speed in August: 6mph

The windiest month (with the highest average wind speed) is March (10.1mph).
The calmest months (with the lowest average wind speed) are July and August (6mph).

Average humidity in August
Belfast, ME

Average humidity in August - Belfast, ME
  • Average humidity in August: 82%

The months with the highest relative humidity are February and July (83%).
The month with the lowest relative humidity is November (77%).

Average rainfall in August
Belfast, ME

Average rainfall in August - Belfast, ME
  • Average rainfall in August: 1.85"

The wettest month (with the highest rainfall) is December (2.72").
The driest months (with the least rainfall) are July and September (1.46").

Average rainfall days in August
Belfast, ME

Average rainfall days in August - Belfast, ME
  • Average rainfall days in August: 13 days

The month with the highest number of rainy days is May (15.3 days).
The month with the least rainy days is February (7.1 days).

Average snowfall in August
Belfast, ME

Average snowfall in August - Belfast, ME
  • Average snowfall in August: 0"

The month with the highest snowfall is January (4.57").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in August
Belfast, ME

Average snowfall days in August - Belfast, ME
  • Average snowfall days in August: 0 days

The month with the highest number of snowfall days is January (10.1 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average sea temperature in August
Belfast, ME

Average sea temperature in August - Belfast, ME
  • Average sea temperature in August: 60.4°F

The best month for swimming (with the highest average sea temperature) is August (60.4°F).
The coldest month (with the lowest average sea temperature) is March (37.8°F).

Average daylight in August /
Average sunshine in August
Belfast, ME

Average daylight in August / Average sunshine in August - Belfast, 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: 9h and 5min

The month with the most sunshine is August (Average sunshine: 9h and 54min).
The month with the least sunshine is February (Average sunshine: 4h and 18min).

Average sunshine days in August
Belfast, ME

Average sunshine days in August - Belfast, ME
  • Average sunshine days in August: 15.8 days

The month with the most sunshine days is September (17.9 days).
The month with the least sunshine days is April (11.7 days).

Average UV index in August
Belfast, ME

Average UV index in August - Belfast, 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
Belfast, ME

Average cloud cover in August - Belfast, ME
  • Average cloud cover in August: 37

The month with the most cloud cover is March (Cloud cover 55).
The months with the least cloud cover are August and September (Cloud cover 37).

Average visibility in August
Belfast, ME

Average visibility in August - Belfast, ME
  • Average visibility in August: 5mi

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

Belfast, Maine, USA

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