Petersburg
Alaska, USA
Long-term weather forecast
Long-term weather forecast

Monthly 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
January, like December, in Petersburg, Alaska, is another cold winter month, with temperature in the range of an average low of 23.4°F (-4.8°C) and an average high of 34.9°F (1.6°C). With an average high-temperature of 34.9°F (1.6°C) and an average low-temperature of 23.4°F (-4.8°C), January is the coldest month. Weather in January »
February, the last month of the winter, in Petersburg, is another cold month, with average temperature ranging between min 26.4°F (-3.1°C) and max 38.8°F (3.8°C). In Petersburg, the average high-temperature is almost the same as in January - a still wintry 38.8°F (3.8°C). Weather in February »

March, the first month of the spring, in Petersburg, is a frosty month, with average temperature ranging between max 43.3°F (6.3°C) and min 29.5°F (-1.4°C). In March, the average high-temperature is practically the same as in February - a chilly 43.3°F (6.3°C). Weather in March »

April is a cool spring month in Petersburg, Alaska, with average temperature varying between 50.4°F (10.2°C) and 33.8°F (1°C). In April, the average high-temperature marginally rises, from a frosty 43.3°F (6.3°C) in March, to a fresh 50.4°F (10.2°C). Weather in April »

May, the last month of the spring, in Petersburg, is a mild month, with temperature in the range of an average high of 56.8°F (13.8°C) and an average low of 39°F (3.9°C). In Petersburg, the average high-temperature in May marginally rises, from a fresh 50.4°F (10.2°C) in April, to a mild 56.8°F (13.8°C). Weather in May »

June, the first month of the summer, in Petersburg, is a comfortable month, with average temperature fluctuating between 61.9°F (16.6°C) and 44.8°F (7.1°C). In Petersburg, the average high-temperature is relatively the same as in May - an enjoyable 61.9°F (16.6°C). Weather in June »

July, like June, in Petersburg, Alaska, is another comfortable summer month, with average temperature varying between 63.9°F (17.7°C) and 48°F (8.9°C). July is the warmest month, with an average high-temperature of 63.9°F (17.7°C) and an average low-temperature of 48°F (8.9°C). Weather in July »

August, the last month of the summer, in Petersburg, is another comfortable month, with average temperature fluctuating between 47.1°F (8.4°C) and 62.2°F (16.8°C). In Petersburg, Alaska, the average high-temperature in August is relatively the same as in July - a still comfortable 62.2°F (16.8°C). Weather in August »

September, the first month of the autumn, in Petersburg, is still a mild month, with temperature in the range of an average low of 43°F (6.1°C) and an average high of 55.9°F (13.3°C). In September, the average high-temperature marginally drops, from an enjoyable 62.2°F (16.8°C) in August, to a moderate 55.9°F (13.3°C). Weather in September »

October, like September, is a frosty autumn month in Petersburg, Alaska, with average temperature ranging between max 47.7°F (8.7°C) and min 37.6°F (3.1°C). In October, the average high-temperature slightly decreases, from a mild 55.9°F (13.3°C) in September, to a chilly 47.7°F (8.7°C). Weather in October »

The last month of the autumn, November, is another cold month in Petersburg, Alaska, with temperature in the range of an average high of 39.6°F (4.2°C) and an average low of 30.7°F (-0.7°C). In November, the average high-temperature marginally drops, from a frosty 47.7°F (8.7°C) in October, to a wintry 39.6°F (4.2°C). Weather in November »

The first month of the winter, December, is also a wintry month in Petersburg, Alaska, with temperature in the range of an average low of 26.4°F (-3.1°C) and an average high of 36°F (2.2°C). In December, the average high-temperature is practically the same as in November - a still cold 36°F (2.2°C). Weather in December »

What is the coldest month in Petersburg?

January is the coldest month in Petersburg, Alaska, with an average high-temperature of 34.9°F (1.6°C) and an average low-temperature of 23.4°F (-4.8°C).

What is the month with the coldest ocean in Petersburg?

The month with the coldest seawater is March, with an average ocean temperature of 41°F (5°C). Swimming in 41°F (5°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.

When are the longest days in Petersburg?

The month with the longest days is June, with an average of 17.7h of daylight.

What is the warmest month in Petersburg?

With an average high-temperature of 63.9°F (17.7°C) and an average low-temperature of 48°F (8.9°C), July is the warmest month.

What is the month with the warmest ocean in Petersburg?

The month with the warmest seawater is August, with an average ocean temperature of 54.1°F (12.3°C). Swimming in 54.1°F (12.3°C) is considered dangerous. Unprotected immersion in temperatures below 50°F (10°C) causes quickly maximum intensity cold shock with hyperventilation.

What is the month with the shortest days in Petersburg?

With an average of 6.9h of daylight, December has the shortest days of the year.
Average temperature - Petersburg, AK
Average sea temperature - Petersburg, AK

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 - Petersburg, AK

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