May weather forecast
Belfast, ME

Weather in May

The last month of the spring, May, is a mild month in Belfast, Maine, with temperature in the range of an average low of 43.9°F (6.6°C) and an average high of 59.7°F (15.4°C).

Temperature

In May, the average high-temperature rises from a chilly 48.9°F (9.4°C) in April to a moderate 59.7°F (15.4°C). In Belfast, the average low-temperature is 43.9°F (6.6°C).

Humidity

In Belfast, the average relative humidity in May is 80%.

Rainfall

In Belfast, Maine, during May, the rain falls for 15.3 days and regularly aggregates up to 2.05" (52mm) of precipitation. In Belfast, Maine, during the entire year, the rain falls for 141.1 days and collects up to 24.29" (617mm) of precipitation.

Snowfall

Months with snowfall in Belfast are January through May, October through December. May is the last month it regularly snows. During 0.1 snowfall days, in May, Belfast aggregates 0.35" (9mm) of snow. Throughout the year, there are 44.3 snowfall days, and 16.81" (427mm) of snow is accumulated.

Ocean temperature

In May, the average ocean temperature in Belfast is 45.1°F (7.3°C).
Note: Swimming in 45.1°F (7.3°C) is considered dangerous. Unprotected immersion in temperatures below 50°F (10°C) causes quickly maximum intensity cold shock with hyperventilation.

Daylight

In May, the average length of the day is 14h and 49min.
On the first day of the month, sunrise is at 5:26 am and sunset at 7:40 pm. On the last day of May, sunrise is at 4:54 am and sunset at 8:12 pm EDT.

Sunshine

The average sunshine in May is 7.6h.

UV index

The average daily maximum UV index in May in Belfast is 4. A UV Index of 3 to 5 symbolizes a moderate threat to health from unprotected exposure to Sun's UV rays for average individuals.
Note: The average daily UV index of 4 in May transform into the following instructions:
Take precautions - Protection against skin and eye damage is obliged. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What is the average humidity in May in Belfast?

In Belfast, the average relative humidity in May is 80%.

How many days does it rain in May in Belfast?

In May, in Belfast, Maine, the rain falls for 15.3 days. Throughout May, 2.05" (52mm) of precipitation is accumulated.

What is the last month it snows in Belfast?

May is the last month it regularly snows. During 0.1 snowfall days, in May, Belfast aggregates 0.35" (9mm) of snow.

What is the ocean temperature in May in Belfast?

In May, the average ocean temperature in Belfast is 45.1°F (7.3°C). At temperatures below 50°F (10°C), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 55.4°F (13°C) is not comfortable.

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

In Belfast, Maine, the average day length in May is 14h and 49min.

When are sunrise and sunset in May in Belfast?

On the first day of May, sunrise is at 5:26 am and sunset at 7:40 pm. On the last day of the month, sunrise is at 4:54 am and sunset at 8:12 pm EDT.

How many hours of sunshine does Belfast have in May?

The average sunshine duration in May in Belfast is 7.6h.

What is the UV index reading in May in Belfast?

In May, the average daily maximum UV index is 4. A UV Index estimate of 3 to 5 represents a moderate vulnerability from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in May
Belfast, ME

Average temperature in May - Belfast, ME
  • Average high temperature in May: 59.7°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 May: 43.9°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).

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Average pressure in May
Belfast, ME

Average pressure in May - Belfast, ME
  • Average pressure in May: 29.99"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 May
Belfast, ME

Average wind speed in May - Belfast, ME
  • Average wind speed in May: 7.6mph

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).

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Average humidity in May
Belfast, ME

Average humidity in May - Belfast, ME
  • Average humidity in May: 80%

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

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Average rainfall in May
Belfast, ME

Average rainfall in May - Belfast, ME
  • Average rainfall in May: 2.05"

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

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Average rainfall days in May
Belfast, ME

Average rainfall days in May - Belfast, ME
  • Average rainfall days in May: 15.3 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).

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Average snowfall in May
Belfast, ME

Average snowfall in May - Belfast, ME
  • Average snowfall in May: 0.35"

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

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Average snowfall days in May
Belfast, ME

Average snowfall days in May - Belfast, ME
  • Average snowfall days in May: 0.1 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).

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Average sea temperature in May
Belfast, ME

Average sea temperature in May - Belfast, ME
  • Average sea temperature in May: 45.1°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).

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

Average daylight in May / Average sunshine in May - Belfast, ME
  • Average daylight in May: 14h and 49min

The month with the longest days is June (Average daylight: 15h and 29min).
The month with the shortest days is December (Average daylight: 8h and 55min).

  • Average sunshine in May: 7h and 36min

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).

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Average sunshine days in May
Belfast, ME

Average sunshine days in May - Belfast, ME
  • Average sunshine days in May: 13.7 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).

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Average UV index in May
Belfast, ME

Average UV index in May - Belfast, ME
  • Average UV index in May: 4

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 May
Belfast, ME

Average cloud cover in May - Belfast, ME
  • Average cloud cover in May: 51

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).

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Average visibility in May
Belfast, ME

Average visibility in May - Belfast, ME
  • Average visibility in May: 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).

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