October weather forecastPetersburg, AK
October
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.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
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: 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: 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: 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: 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: 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: 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: 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: 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: 10h and 18min
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 12min
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: 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: 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: 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: 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).
