October weather forecast
Petersburg, AK

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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 sees a steady decline in temperature, locking Petersburg firmly in the embrace of fall. Accompanied by increased winds and rising humidity, the season of autumn truly sets in. Sea temperatures begin to fall, and daylight hours continue to decrease. The change in Petersburg’s weather during this phase is sharp, as the city transitions from autumn to its long winter. As autumn reaches its peak, October paints Petersburg in varied hues of fall, preparing for the snowy months ahead.

Temperature

October ushers in a minor alteration in Petersburg's climate, with the average high-temperature moving from September's cool 54.3°F (12.4°C) to a chilly 46°F (7.8°C). Petersburg logs an average low-temperature of 39.7°F (4.3°C) during the nights of October, subtly lower than its daytime highs.

Humidity

In Petersburg, the average relative humidity in October 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

January through May, October through December are months with snowfall. October is the first month it typically snows. Throughout October, in the average 0.2 snowfall days, it receives 0.31" (8mm) of snow. In Petersburg, Alaska, 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: Beware when you're in 48.7°F (9.3°C) waters; 55.4°F (13°C) is chilling and anything below 50°F (10°C) could cause breathing hindrance and a sudden cold shock, given your physical condition.

Daylight

The average length of the day in October is 10h and 20min.
On the first day of October, sunrise is at 6:57 am and sunset at 6:25 pm. On the last day of the month, sunrise is at 8:01 am and sunset at 5:09 pm AKDT.

Sunshine

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

UV index

In October, the average daily maximum UV index is 2. A UV Index value of 2, and less, symbolizes a low health risk from unsafe exposure to UV radiation for the average person.
Note: In October, a daily maximum UV index of 2 leads to the following instructions:
Extended exposure to the sun should always be avoided by children, infants, and those with sensitive skin. It's crucial to reduce time in the direct Sun around mid-day due to the intense solar radiation. Combat UV radiation's detrimental effects with sun-safe clothing and UV-blocking eyewear. Attention! Nearly twice the Sun's UV radiation can be reflected by snow.

Frequently asked questions

What is the usual temperature for Petersburg in October?

Petersburg in October has an average high-temperature of 46°F (7.8°C) and an average low-temperature of 39.7°F (4.3°C).

What is the average humidity in October?

In October, the average relative humidity is 82%.

What is the wettest month?

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

How much does it rain in October?

In October, the rain falls for 20.1 days. Throughout October, 6.3" (160mm) of precipitation is accumulated.

When does it start to snow?

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

What is the ocean temperature in October?

In Petersburg, in October, the average water temperature is 48.7°F (9.3°C). Swimming in 48.7°F (9.3°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.

What is the average length of the day in October?

In October, the average day length is 10h and 20min.

What time are sunrise and sunset in October in Petersburg?

On the first day of October, sunrise is at 6:57 am and sunset at 6:25 pm. On the last day of the month, sunrise is at 8:01 am and sunset at 5:09 pm AKDT.

How many hours of sunshine does Petersburg have in October?

The average sunshine duration in October is 4.2h.

What is the UV index reading in October in Petersburg?

In Petersburg, the average daily maximum UV index in October is 2. A UV Index of 2, and less, symbolizes a low health risk from exposure to the Sun's UV radiation.
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 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).

Average pressure in October
Petersburg, AK

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

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

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).

Average humidity in October
Petersburg, AK

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

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

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").

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).

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").
The months with the least snowfall are June, July, August and September (0").

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).
The months with the least snowfall days are June, July, August and September (0 days).

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).

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

Average daylight in October / Average sunshine in October - Petersburg, AK
  • Average daylight in October: 10h and 2min

The month with the longest days is June (Average daylight: 17h and 42min).
The month with the shortest days is December (Average daylight: 6h and 54min).

  • Average sunshine in October: 4h and 1min

The month with the most sunshine is May (Average sunshine: 7h and 24min).
The months with the least sunshine are January and November (Average sunshine: 3h and 24min).

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).

Average UV index in October
Petersburg, AK

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

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

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).
The months with the least cloud cover are February and May (Cloud cover 54).

Average visibility in October
Petersburg, AK

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

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

Petersburg, Alaska, USA

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