May weather forecast and climate
Port Heiden, AK

Weather in May

May, the last month of the spring, in Port Heiden, is a frosty month, with average temperature fluctuating between 46°F (7.8°C) and 37.9°F (3.3°C).

Temperature

In May, the average high-temperature slightly increases, from a wintry 37.8°F (3.2°C) in April, to a frosty 46°F (7.8°C). In Port Heiden, the average low-temperature is 37.9°F (3.3°C).

Humidity

With an average relative humidity of 78%, May is the least humid month in Port Heiden, Alaska.

Rainfall

In May, in Port Heiden, the rain falls for 13.7 days. Throughout May, 0.87" (22mm) of precipitation is accumulated. Throughout the year, in Port Heiden, there are 160.7 rainfall days, and 16.57" (421mm) of precipitation is accumulated.

Snowfall

Months with snowfall in Port Heiden are January through May, September through December. May is the last month it regularly snows. During 3.2 snowfall days, Port Heiden aggregates 0.55" (14mm) of snow. In Port Heiden, during the entire year, snow falls for 83.4 days, and aggregates up to 23.94" (608mm) of snow.

Daylight

The average length of the day in May is 16.6h.

Sunshine

With an average of 7.7h of sunshine, May has the most sunshine of the year.

UV index

May through September, with an average maximum UV index of 3, are months with the highest UV index. A UV Index estimate of 3 to 5 represents a moderate threat to health from unprotected exposure to the Sun's UV rays for the ordinary person.
Note: The daily maximum UV index of 3 interpret into the following advice:
Take precautions - Protection against the skin and eye damage is obliged. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. 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. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the temperature in May in Port Heiden?

In May, the average high-temperature is 46°F (7.8°C), and the average low-temperature is 37.9°F (3.3°C).

What is the least humid month in Port Heiden?

May is the least humid month in Port Heiden, with an average relative humidity of 78%.

What is the average humidity in May in Port Heiden?

The average relative humidity in May in Port Heiden, Alaska, is 78%.

How many days does it rain in May in Port Heiden?

In Port Heiden, during May, the rain falls for 13.7 days and regularly aggregates up to 0.87" (22mm) of precipitation.

What is the last month it snows in Port Heiden?

May is the last month it regularly snows in Port Heiden, Alaska. During 3.2 snowfall days, in May, Port Heiden aggregates 0.55" (14mm) of snow.

What is the average length of the day in May in Port Heiden?

In Port Heiden, the average length of the day in May is 16.6h.

What month has the most sunshine in Port Heiden?

With an average of 7.7h of sunshine, May has the most sunshine of the year in Port Heiden.

How long on average sun shines in May in Port Heiden?

In May, the average sunshine in Port Heiden is 7.7h.

When is the highest UV index in Port Heiden?

Months with the highest UV index are May through September, with an average maximum UV index of 3.

What is the UV index reading in May in Port Heiden?

In Port Heiden, Alaska, the average daily maximum UV index in May is 3. A UV Index of 3 to 5 symbolizes a moderate vulnerability from unprotected exposure to the UV radiation.

Average temperature in May
Port Heiden, AK

Average temperature in May - Port Heiden, AK
  • Average high temperature in May: 46°F

The warmest month (with the highest average high temperature) is August (56.8°F).
The month with the lowest average high temperature is January (28.9°F).

  • Average low temperature in May: 37.9°F

The month with the highest average low temperature is August (49.1°F).
The coldest months (with the lowest average low temperature) are January and March (23.4°F).

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Average pressure in May
Port Heiden, AK

Average pressure in May - Port Heiden, AK
  • Average pressure in May: 29.86"

The month with the highest atmospheric pressure is July (29.97").
The month with the lowest atmospheric pressure is December (29.54").

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Average wind speed in May
Port Heiden, AK

Average wind speed in May - Port Heiden, AK
  • Average wind speed in May: 10.6mph

The windiest month (with the highest average wind speed) is December (14.8mph).
The calmest month (with the lowest average wind speed) is July (9.1mph).

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Average humidity in May
Port Heiden, AK

Average humidity in May - Port Heiden, AK
  • Average humidity in May: 78%

The month with the highest relative humidity is January (88%).
The month with the lowest relative humidity is May (78%).

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Average rainfall in May
Port Heiden, AK

Average rainfall in May - Port Heiden, AK
  • Average rainfall in May: 0.87"

The wettest month (with the highest rainfall) is October (2.17").
The driest month (with the least rainfall) is June (0.83").

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Average rainfall days in May
Port Heiden, AK

Average rainfall days in May - Port Heiden, AK
  • Average rainfall days in May: 13.7 days

The month with the highest number of rainy days is September (19.2 days).
The month with the least rainy days is March (7.6 days).

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Average snowfall in May
Port Heiden, AK

Average snowfall in May - Port Heiden, AK
  • Average snowfall in May: 0.55"

The month with the highest snowfall is December (5.71").
Months with the least snowfall are June, July and August (0").

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Average snowfall days in May
Port Heiden, AK

Average snowfall days in May - Port Heiden, AK
  • Average snowfall days in May: 3.2 days

The month with the highest number of snowfall days is December (15.1 days).
Months with the least snowfall days are June, July and August (0 days).

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Average daylight in May /
Average sunshine in May
Port Heiden, AK

Average daylight in May / Average sunshine in May - Port Heiden, AK
  • Average daylight in May: 16.6h

The month with the longest days is June (Average daylight: 17.8h).
The month with the shortest days is December (Average daylight: 6.8h).

  • Average sunshine in May: 7.7h

The month with the most sunshine is May (Average sunshine: 7.7h).
The month with the least sunshine is December (Average sunshine: 2.4h).

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Average sunshine days in May
Port Heiden, AK

Average sunshine days in May - Port Heiden, AK
  • Average sunshine days in May: 13 days

The month with the most sunshine days is May (13 days).
The month with the least sunshine days is November (6 days).

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Average UV index in May
Port Heiden, AK

Average UV index in May - Port Heiden, AK
  • Average UV index in May: 3

Months with the highest UV index are May, June, July, August and September (UV index 3).
Months with the lowest UV index are February, March, November and December (UV index 1).

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Average cloud cover in May
Port Heiden, AK

Average cloud cover in May - Port Heiden, AK
  • Average cloud cover in May: 59

The month with the most cloud cover is July (Cloud cover 69).
The month with the least cloud cover is May (Cloud cover 59).

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Average visibility in May
Port Heiden, AK

Average visibility in May - Port Heiden, AK
  • Average visibility in May: 6mi

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

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