May weather forecast and climate
Petersburg, AK

Colorful buildings, docked ships in Quaint fishing village in Petersburg, Alaska, on Mitkof Island
Colorful buildings, docked ships in Quaint fishing village in Petersburg, Alaska, on Mitkof Island

Weather in May

May, the last month of the spring, in Petersburg, is a fresh month, with average temperature varying between 51.6°F (10.9°C) and 41.9°F (5.5°C).

Temperature

In May, the average high-temperature marginally rises, from a chilly 43.3°F (6.3°C) in April, to a cool 51.6°F (10.9°C). In Petersburg, the average low-temperature is 41.9°F (5.5°C).

Humidity

With an average relative humidity of 81%, May is the least humid month in Petersburg.

Rainfall

May is the month with the least rainfall. Rain falls for 17.1 days and accumulates 2.01" (51mm) of precipitation.

Snowfall

January through May, October through December are months with snowfall in Petersburg. May is the last month it regularly snows. During 0.2 snowfall days, Petersburg aggregates 0.12" (3mm) of snow. Throughout the year, in Petersburg, Alaska, there are 47.5 snowfall days, and 58.23" (1479mm) of snow is accumulated.

Ocean temperature

In Petersburg, the average water temperature is 45.3°F (7.4°C).
Note: 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.

Daylight

In May, the average length of the day is 16.5h.

Sunshine

With an average of 7.4h of sunshine, May has the most sunshine of the year.

UV index

In May, the average daily maximum UV index is 3. A UV Index reading of 3 to 5 represents a medium health hazard 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 sun damage is advised. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. 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 Petersburg?

The average high-temperature, in May, in Petersburg, Alaska, is 51.6°F (10.9°C), while the average low-temperature is 41.9°F (5.5°C).

What is the least humid month in Petersburg?

With an average relative humidity of 81%, May is the least humid month in Petersburg, Alaska.

What is the average humidity in May in Petersburg?

In May, the average relative humidity in Petersburg is 81%.

How many days does it rain in May in Petersburg?

In Petersburg, Alaska, in May, it is raining for 17.1 days, with typically 2.01" (51mm) of accumulated precipitation.

What is the driest month in Petersburg?

May is the month with the least rainfall in Petersburg. Rain falls for 17.1 days and accumulates 2.01" (51mm) of precipitation.

What is the last month it snows in Petersburg?

May is the last month it regularly snows. During 0.2 snowfall days, in May, Petersburg aggregates 0.12" (3mm) of snow.

What is the water temperature in May in Petersburg?

In May, the average ocean temperature in Petersburg is 45.3°F (7.4°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 Petersburg?

In Petersburg, the average length of the day in May is 16.5h.

What month has the most sunshine in Petersburg?

With an average of 7.4h of sunshine, May has the most sunshine of the year in Petersburg, Alaska.

How many hours of sunshine does Petersburg have in May?

The average sunshine in May in Petersburg is 7.4h.

How high is the UV index in May in Petersburg?

The average daily maximum UV index in May in Petersburg is 3. A UV Index of 3 to 5 symbolizes a medium health risk from unsafe exposure to the Sun's UV rays.

Average temperature in May
Petersburg, AK

Average temperature in May - Petersburg, AK
  • Average high temperature in May: 51.6°F

The warmest month (with the highest average high temperature) is July (59.7°F).
The month with the lowest average high temperature is December (32.4°F).

  • Average low temperature in May: 41.9°F

The month with the highest average low temperature is July (50.2°F).
The coldest month (with the lowest average low temperature) is February (25.9°F).

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Average pressure in May
Petersburg, AK

Average pressure in May - Petersburg, AK
  • Average pressure in May: 30"

The month with the highest atmospheric pressure is July (30.05").
The month with the lowest atmospheric pressure is November (29.8").

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Average wind speed in May
Petersburg, AK

Average wind speed in May - Petersburg, AK
  • Average wind speed in May: 4.6mph

The windiest month (with the highest average wind speed) is January (8.2mph).
The calmest month (with the lowest average wind speed) is July (3.9mph).

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Average humidity in May
Petersburg, AK

Average humidity in May - Petersburg, AK
  • Average humidity in May: 81%

Months with the highest relative humidity are January and August (86%).
The month with the lowest relative humidity is May (81%).

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Average rainfall in May
Petersburg, AK

Average rainfall in May - Petersburg, AK
  • Average rainfall in May: 2.01"

The wettest month (with the highest rainfall) is October (6.3").
The driest month (with the least rainfall) is May (2.01").

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Average rainfall days in May
Petersburg, AK

Average rainfall days in May - Petersburg, AK
  • Average rainfall days in May: 17.1 days

The month with the highest number of rainy days is October (20.1 days).
The month with the least rainy days is February (9.5 days).

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Average snowfall in May
Petersburg, AK

Average snowfall in May - Petersburg, AK
  • Average snowfall in May: 0.12"

The month with the highest snowfall is March (13.46").
Months with the least snowfall are June, July, August and September (0").

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Average snowfall days in May
Petersburg, AK

Average snowfall days in May - Petersburg, AK
  • Average snowfall days in May: 0.2 days

The month with the highest number of snowfall days is March (10.8 days).
Months with the least snowfall days are June, July, August and September (0 days).

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Average sea temperature in May
Petersburg, AK

Average sea temperature in May - Petersburg, AK
  • Average sea temperature in May: 45.4°F

The best month for swimming (with the highest average sea temperature) is August (54.2°F).
The coldest month (with the lowest average sea temperature) is March (41°F).

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Average daylight in May /
Average sunshine in May
Petersburg, AK

Average daylight in May / Average sunshine in May - Petersburg, AK
  • Average daylight in May: 16.5h

The month with the longest days is June (Average daylight: 17.7h).
The month with the shortest days is December (Average daylight: 6.9h).

  • Average sunshine in May: 7.4h

The month with the most sunshine is May (Average sunshine: 7.4h).
Months with the least sunshine are January and November (Average sunshine: 3.4).

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Average sunshine days in May
Petersburg, AK

Average sunshine days in May - Petersburg, AK
  • Average sunshine days in May: 11.3 days

The month with the most sunshine days is December (12.5 days).
The month with the least sunshine days is November (8 days).

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Average UV index in May
Petersburg, AK

Average UV index in May - Petersburg, AK
  • Average UV index in May: 3

Months with the highest UV index are July and August (UV index 4).
Months with the lowest UV index are November and December (UV index 1).

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Average cloud cover in May
Petersburg, AK

Average cloud cover in May - Petersburg, AK
  • Average cloud cover in May: 54

The month with the most cloud cover is January (Cloud cover 66).
Months with the least cloud cover are February and May (Cloud cover 54).

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Average visibility in May
Petersburg, AK

Average visibility in May - Petersburg, AK
  • Average visibility in May: 6mi

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

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