August weather forecast and climate
Belfast, ME

The last month of the summer, August, is another warm month in Belfast, Maine, with average temperature ranging between max 73.9°F (23.3°C) and min 56.8°F (13.8°C).

Temperature

The warmest months are July and August, with an average high-temperature of 73.9°F (23.3°C).

Humidity

In August, the average relative humidity is 82%.

Rainfall

In Belfast, it is raining for 13 days, with typically 1.85" (47mm) of accumulated precipitation. Throughout the year, in Belfast, there are 141.1 rainfall days, and 24.29" (617mm) of precipitation is accumulated.

Snowfall

June through September are months without snowfall.

Ocean temperature

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

Daylight

The average length of the day in Belfast is 14h.

Sunshine

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

UV index

Months with the highest UV index in Belfast are June through August, with an average maximum UV index of 5. A UV Index of 3 to 5 symbolizes a moderate threat to health from unprotected exposure to the Sun's UV rays for average individuals.
Note: The daily maximum UV index of 5 interpret into the following advice:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes.

What is the warmest month in Belfast?

July and August, with an average high-temperature of 73.9°F (23.3°C), are warmest months.

What is the temperature in August in Belfast?

In August, in Belfast, Maine, 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 in Belfast?

The average relative humidity in August is 82%.

How many days does it rain in August in Belfast?

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

When it does not snow in Belfast?

June through September are months without snowfall in Belfast.

When is the ocean warmest in Belfast?

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

How cold is the water in August in Belfast?

In Belfast, the average seawater temperature in August is 60.4°F (15.8°C). For most, swimming in 60.4°F (15.8°C) is not an enjoyable activity. Furthermore, controlling your breathing becomes progressively more difficult as the water temperature decreases from 69.8°F (21°C) to 59°F (15°C).

What is the average length of the day in August in Belfast?

In August, the average length of the day in Belfast is 14h.

What month has the most sunshine in Belfast?

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

How long on average sun shines in August in Belfast?

In Belfast, Maine, the average sunshine in August is 9.9h.

What are the months with the highest UV index in Belfast?

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

How high is the UV index in August in Belfast?

The average daily maximum UV index in August in Belfast, Maine, is 5. A UV Index estimate of 3 to 5 represents a medium health risk from unsafe exposure to the Sun's UV rays.
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: 29.96"

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

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: 82%

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: 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: 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: 0"

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

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).
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: 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: 14h

The month with the longest days is June (Average daylight: 15.5h).
The month with the shortest days is December (Average daylight: 8.9h).

  • Average sunshine in August: 9.9h

The month with the most sunshine is August (Average sunshine: 9.9h).
The month with the least sunshine is February (Average sunshine: 4.3h).

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: 5

Months with the highest UV index are June, July and August (UV index 5).
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: 37

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

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

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