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

The average high-temperature in Petersburg slightly decreases in October, shifting from a cool 54.3°F (12.4°C) in September to a frosty 46°F (7.8°C). In Petersburg, the month of October records an average minimum temperature of 39.7°F (4.3°C), a slight dip from the daily highs.

Humidity

In October, the average relative humidity is 82%.

Rainfall

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.

Snowfall

January through May, October through December are months with snowfall 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. Throughout the year, in Petersburg, there are 47.5 snowfall days, and 58.23" (1479mm) of snow is accumulated.

Ocean temperature

In October, the average ocean temperature in Petersburg is 48.7°F (9.3°C).
Note: Dipping into 48.7°F (9.3°C) below 50°F (10°C) needs protective wear, or you'd face cold shock and breathing issues swiftly. Meanwhile, a slight swim around 55.4°F (13°C) feels cold to the bone.

Daylight

In Petersburg, the average length of the day in October is 10h and 20min.
On the first day of October in Petersburg, 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

The average daily maximum UV index in October in Petersburg is 2. A UV Index reading of 2, and below, represents a low health risk from exposure to the Sun's UV radiation for the average person.
Note: A maximum UV index of 2 in October translates into the following recommendations:
Children, infants, and individuals with sensitive skin should be constantly protected from extended sun exposure. Considering the harmful UV rays from the Sun during midday, it's essential to reduce exposure. Opt for tightly woven and loose clothing to enhance protection from the Sun. Notice this! Nearly double the intensity of the Sun's UV radiation can be caused by snow reflection.
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Frequently asked questions

What is the usual temperature for Petersburg in October?

The average high-temperature, in October, in Petersburg, is 46°F (7.8°C), while 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 is 82%.

What is the rainiest month in Petersburg?

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

How much does it rain in Petersburg 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 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 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 Petersburg?

The average day length in October is 10h and 20min.

What time are sunrise and sunset in October in Petersburg?

In October, on the first day of the month, 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 long on average sun shines in October in Petersburg?

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

What is the UV index intensity in October in Petersburg?

In Petersburg, Alaska, the average daily maximum UV index in October is 2. A UV Index estimate of 2, and below, represents a minimal hazard to health from unprotected exposure to 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).

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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).

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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%

The 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").
The 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).
The 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: 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).

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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

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).

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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).
The 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

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).

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Petersburg, Alaska, USA

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