May weather forecast
Castine, ME

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Weather in May

The last month of the spring, May, is a refreshing month in Castine, Maine, with an average temperature fluctuating between 43.9°F (6.6°C) and 59.7°F (15.4°C).

Temperature

May's onset brings a temperature rise, moving from a frosty 48.9°F (9.4°C) in April to a refreshing 59.7°F (15.4°C). During the nights in May, Castine experiences a consistent average temperature of 43.9°F (6.6°C).

Humidity

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

Rainfall

In Castine, in May, during 15.3 rainfall days, 2.05" (52mm) of precipitation is typically accumulated. Throughout the year, in Castine, there are 141.1 rainfall days, and 24.29" (617mm) of precipitation is accumulated.

Snowfall

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

Ocean temperature

In May, the average ocean temperature in Castine, Maine, is 44.4°F (6.9°C).
Note: While a brief time in 44.4°F (6.9°C) at 55.4°F (13°C) is already bracing, plunging below 50°F (10°C) can severely affect breathing and introduce a cold shock, relying on your physical state.

Daylight

In May, the average length of the day in Castine is 14h and 49min.
On the first day of the month, sunrise is at 5:24 am and sunset at 7:39 pm. On the last day of May, in Castine, Maine, sunrise is at 4:53 am and sunset at 8:12 pm EDT.

Sunshine

The average sunshine in May in Castine is 7.6h.

UV index

The average daily maximum UV index in May in Castine, Maine, is 4. A UV Index of 3 to 5 symbolizes a medium vulnerability from unsafe exposure to UV radiation for the average person.
Note: A daily maximum UV index of 4 in May translates into the following instructions:
Act with care - Obligation to protect against skin and eye damage is highlighted. The Sun is at its harshest during midday; protect yourself by staying in shaded areas and minimizing exposure. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration. Notice! The UV radiation of the Sun can be intensified nearly twofold due to the reflective quality of snow.
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Frequently asked questions

What is the usual temperature for Castine in May?

The average high-temperature, in May, in Castine, is 59.7°F (15.4°C), while the average low-temperature is 43.9°F (6.6°C).

What is the average humidity in May in Castine?

The average relative humidity in May in Castine, Maine, is 80%.

How many days does it rain in May in Castine?

In Castine, Maine, in May, it is raining for 15.3 days, with typically 2.05" (52mm) of accumulated precipitation.

What is the last month it snows in Castine?

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

How cold is the water in May in Castine?

In May, the average ocean temperature is 44.4°F (6.9°C). Swimming in 44.4°F (6.9°C) is considered life-threatening. Even a few minutes in 55.4°F (13°C) water is uncomfortable, and swimming below 50°F (10°C) may cause total loss of breathing control and cold shock, depending on a person's physique.

How many hours of daylight does Castine have in May?

The average day length in May in Castine, Maine, is 14h and 49min.

When are sunrise and sunset in May in Castine?

On the first day of May, sunrise is at 5:24 am and sunset at 7:39 pm. On the last day of the month, sunrise is at 4:53 am and sunset at 8:12 pm EDT.

How many hours of sunshine does Castine have in May?

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

How high is the UV index in May in Castine?

In May, the average daily maximum UV index in Castine is 4. A UV Index value of 3 to 5 symbolizes a moderate health threat from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in May
Castine, ME

Average temperature in May - Castine, 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
Castine, ME

Average pressure in May - Castine, 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
Castine, ME

Average wind speed in May - Castine, 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
Castine, ME

Average humidity in May - Castine, 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
Castine, ME

Average rainfall in May - Castine, 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
Castine, ME

Average rainfall days in May - Castine, 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
Castine, ME

Average snowfall in May - Castine, 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
Castine, ME

Average snowfall days in May - Castine, 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
Castine, ME

Average sea temperature in May - Castine, ME
  • Average sea temperature in May: 44.5°F

The best month for swimming (with the highest average sea temperature) is August (58.6°F).
The coldest month (with the lowest average sea temperature) is March (38.2°F).

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

Average daylight in May / Average sunshine in May - Castine, ME
  • Average daylight in May: 14h and 5min

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 May: 7h and 4min

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
Castine, ME

Average sunshine days in May - Castine, 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
Castine, ME

Average UV index in May - Castine, 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
Castine, ME

Average cloud cover in May - Castine, 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
Castine, ME

Average visibility in May - Castine, 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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Castine, Maine, USA

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