October 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 October

October, like September, is a frosty autumn month in Petersburg, Alaska, with average temperature varying between 46°F (7.8°C) and 39.7°F (4.3°C).

Temperature

In October, the average high-temperature slightly decreases, from a cool 54.3°F (12.4°C) in September, to a chilly 46°F (7.8°C). The average low-temperature, in October, is 39.7°F (4.3°C).

Humidity

In October, the average relative humidity in Petersburg is 82%.

Rainfall

October is the month with the most rainfall in Petersburg. Rain falls for 20.1 days and accumulates 6.3" (160mm) of precipitation.

Snowfall

Months with snowfall are January through May, October through December. October is the first month it typically snows in Petersburg. Throughout October, in the average 0.2 snowfall days, it receives 0.31" (8mm) of snow. In Petersburg, during the entire year, snow falls for 47.5 days, and aggregates up to 58.23" (1479mm) of snow.

Ocean temperature

In October, the average ocean temperature is 48.7°F (9.3°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 Petersburg, the average length of the day is 10.3h.

Sunshine

In October, the average sunshine is 4.2h.

UV index

The average daily maximum UV index in October is 2. A UV Index estimate of 2, and below, represents a low threat to health from unprotected exposure to the Sun's UV rays for ordinary individuals.
Note: In October, the average maximum UV index of 2 translate into the following recommendations:
Extended sun exposure is not an issue for the majority. Children, infants, and fair-skinned individuals always need to be protected. 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. 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 October in Petersburg?

In October, in Petersburg, Alaska, the average high-temperature is 46°F (7.8°C), and the average low-temperature is 39.7°F (4.3°C).

What is the average humidity in October in Petersburg?

In October, the average relative humidity in Petersburg, Alaska, is 82%.

How much does it rain in Petersburg in October?

In Petersburg, in October, during 20.1 rainfall days, 6.3" (160mm) of precipitation is typically accumulated.

What is the rainiest month in Petersburg?

The month with the most rainfall in Petersburg is October when the rain falls for 20.1 days and typically aggregates up to 6.3" (160mm) of precipitation.

When does it start to snow in Petersburg?

October is the first month it typically snows in Petersburg. Throughout October, in the average 0.2 snowfall days, it receives 0.31" (8mm) of snow.

How cold is the water in October in Petersburg?

In October, the average ocean temperature in Petersburg is 48.7°F (9.3°C). Swimming in 48.7°F (9.3°C) is considered dangerous. Unprotected immersion in temperatures below 50°F (10°C) causes quickly maximum intensity cold shock with hyperventilation.

What is the average length of the day in October in Petersburg?

In Petersburg, Alaska, the average length of the day in October is 10.3h.

How long on average sun shines in October in Petersburg?

In Petersburg, the average sunshine in October is 4.2h.

What is the UV index reading in October in Petersburg?

In October, the average daily maximum UV index in Petersburg, Alaska, is 2. A UV Index reading of 2, and below, represents a low health risk from the exposure to the Sun's UV rays.

Average temperature in October
Petersburg, AK

Average temperature in October - Petersburg, AK
  • Average high temperature in October: 46°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 October: 39.7°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 October
Petersburg, AK

Average pressure in October - Petersburg, AK
  • Average pressure in October: 29.87"

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 October
Petersburg, AK

Average wind speed in October - Petersburg, AK
  • Average wind speed in October: 6.7mph

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 October
Petersburg, AK

Average humidity in October - Petersburg, AK
  • Average humidity in October: 82%

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 October
Petersburg, AK

Average rainfall in October - Petersburg, AK
  • Average rainfall in October: 6.3"

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 October
Petersburg, AK

Average rainfall days in October - Petersburg, AK
  • Average rainfall days in October: 20.1 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 October
Petersburg, AK

Average snowfall in October - Petersburg, AK
  • Average snowfall in October: 0.31"

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 October
Petersburg, AK

Average snowfall days in October - Petersburg, AK
  • Average snowfall days in October: 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 October
Petersburg, AK

Average sea temperature in October - Petersburg, AK
  • Average sea temperature in October: 48.7°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 October /
Average sunshine in October
Petersburg, AK

Average daylight in October / Average sunshine in October - Petersburg, AK
  • Average daylight in October: 10.3h

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 October: 4.2h

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 October
Petersburg, AK

Average sunshine days in October - Petersburg, AK
  • Average sunshine days in October: 10.1 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 October
Petersburg, AK

Average UV index in October - Petersburg, AK
  • Average UV index in October: 2

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 October
Petersburg, AK

Average cloud cover in October - Petersburg, AK
  • Average cloud cover in October: 58

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 October
Petersburg, AK

Average visibility in October - Petersburg, AK
  • Average visibility in October: 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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