September weather forecast
Kodiak, AK

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Natural forests, mountains, and distant hill ranges surrounding the small town of Kodiak in Alaska
Natural forests, mountains, and distant hill ranges surrounding the small town of Kodiak in Alaska

Weather in September

The Kodiak, Alaska weather in September, presents an interplay of summer and autumn, with temperature and rainfall changes becoming more noticeable. A significant change from August's weather is the decrease in daylight hours, indicating the onset of autumn. Despite the reduction in daylight, September presents the highest average wind gust speed at 16mph (25.7km/h). There's a slight increase observed in the average rainfall at 3.27" (83mm). The cooler temperatures and increased wind gusts bestow Kodiak with a distinctive, invigorating autumnal atmosphere.

Temperature

Kodiak marks the arrival of September with an average high-temperature of a cool 53.1°F (11.7°C), hardly different from August's 57.6°F (14.2°C). Kodiak records a negligible downturn from daytime temperatures, averaging a low of 47.7°F (8.7°C) in the month of September.

Humidity

In Kodiak, the average relative humidity in September is 83%.

Rainfall

In Kodiak, during September, the rain falls for 17.6 days and regularly aggregates up to 3.27" (83mm) of precipitation. Throughout the year, there are 171.2 rainfall days, and 37.32" (948mm) of precipitation is accumulated.

Snowfall

January through May, September through December are months with snowfall. September is the first month it typically snows. Throughout September, in the average 0.1 snowfall days, it receives 0.08" (2mm) of snow. In Kodiak, during the entire year, snow falls for 35.1 days and aggregates up to 13.74" (349mm) of snow.

Ocean temperature

In Kodiak, Alaska, in September, the average water temperature is 51.1°F (10.6°C).
Note: Taking a dip in 51.1°F (10.6°C) can be perilous. Submersion in temperatures under 50°F (10°C) triggers severe cold shock accompanied by hyperventilation.

Daylight

The average length of the day in September in Kodiak is 12h and 46min.
On the first day of September, sunrise is at 7:12 am and sunset at 9:06 pm. On the last day of the month, sunrise is at 8:13 am and sunset at 7:44 pm AKDT.

Sunshine

In Kodiak, the average sunshine in September is 5.8h.

UV index

The months with the highest UV index in Kodiak are June through September, with an average maximum UV index of 3. A UV Index reading of 3 to 5 represents a moderate threat to health from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: The daily maximum UV index of 3 in September interprets into the following advice:
Undertake protective steps - Preventing sun damage is advised. The mid-day Sun emits the most powerful UV radiation, so seek shade and minimize exposure. A hat with a broad brim is indispensable, filtering out up to half of UV rays. Be aware! The reflective nature of snow can magnify the Sun's UV radiation almost twofold.
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Frequently asked questions

What is the temperature in September in Kodiak?

Kodiak in September has an average high-temperature of 53.1°F (11.7°C) and an average low-temperature of 47.7°F (8.7°C).

What is the average humidity in September in Kodiak?

The average relative humidity in September is 83%.

How many days does it rain in September in Kodiak?

In September, in Kodiak, Alaska, the rain falls for 17.6 days. Throughout September, 3.27" (83mm) of precipitation is accumulated.

When does it start to snow in Kodiak?

September is the first month it typically snows in Kodiak. Throughout September, in the average 0.1 snowfall days, it receives 0.08" (2mm) of snow.

What is the water temperature in September in Kodiak?

In September, the average ocean temperature in Kodiak is 51.1°F (10.6°C). Swimming in 51.1°F (10.6°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.

How many hours of daylight does Kodiak have in September?

In Kodiak, the average day length in September is 12h and 46min.

What time are sunrise and sunset in September in Kodiak?

In September, on the first day of the month, sunrise is at 7:12 am and sunset at 9:06 pm. On the last day of the month, in Kodiak, Alaska, sunrise is at 8:13 am and sunset at 7:44 pm AKDT.

How long on average sun shines in September in Kodiak?

In September, the average sunshine duration in Kodiak is 5.8h.

When is the highest UV index in Kodiak?

June through September, with an average maximum UV index of 3, are months with the highest UV index.

What is the UV index intensity in September in Kodiak?

The average daily maximum UV index in September in Kodiak, Alaska, is 3. A UV Index estimate of 3 to 5 represents a medium health risk from exposure to Sun's UV rays.
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 September
Kodiak, AK

Average temperature in September - Kodiak, AK
  • Average high temperature in September: 53.1°F

The warmest month (with the highest average high temperature) is August (57.6°F).
The month with the lowest average high temperature is January (35.4°F).

  • Average low temperature in September: 47.7°F

The month with the highest average low temperature is August (50.7°F).
The coldest month (with the lowest average low temperature) is March (30.6°F).

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Average pressure in September
Kodiak, AK

Average pressure in September - Kodiak, AK
  • Average pressure in September: 29.71"Hg

The month with the highest atmospheric pressure is July (29.98"Hg).
The month with the lowest atmospheric pressure is December (29.55"Hg).

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Average wind speed in September
Kodiak, AK

Average wind speed in September - Kodiak, AK
  • Average wind speed in September: 10.3mph

The windiest month (with the highest average wind speed) is December (14.2mph).
The calmest month (with the lowest average wind speed) is July (7.8mph).

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Average humidity in September
Kodiak, AK

Average humidity in September - Kodiak, AK
  • Average humidity in September: 83%

The month with the highest relative humidity is July (86%).
The months with the lowest relative humidity are March and November (80%).

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Average rainfall in September
Kodiak, AK

Average rainfall in September - Kodiak, AK
  • Average rainfall in September: 3.27"

The wettest months (with the highest rainfall) are October and November (4.53").
The driest month (with the least rainfall) is July (1.85").

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Average rainfall days in September
Kodiak, AK

Average rainfall days in September - Kodiak, AK
  • Average rainfall days in September: 17.6 days

The month with the highest number of rainy days is September (17.6 days).
The month with the least rainy days is March (10.8 days).

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Average snowfall in September
Kodiak, AK

Average snowfall in September - Kodiak, AK
  • Average snowfall in September: 0.08"

The month with the highest snowfall is March (3.15").
The months with the least snowfall are June, July and August (0").

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Average snowfall days in September
Kodiak, AK

Average snowfall days in September - Kodiak, AK
  • Average snowfall days in September: 0.1 days

The month with the highest number of snowfall days is March (8.5 days).
The months with the least snowfall days are June, July and August (0 days).

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Average sea temperature in September
Kodiak, AK

Average sea temperature in September - Kodiak, AK
  • Average sea temperature in September: 51.1°F

The best month for swimming (with the highest average sea temperature) is August (53.4°F).
The coldest month (with the lowest average sea temperature) is March (39.5°F).

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Average daylight in September /
Average sunshine in September
Kodiak, AK

Average daylight in September / Average sunshine in September - Kodiak, AK
  • Average daylight in September: 12h and 5min

The month with the longest days is June (Average daylight: 18h and 0min).
The month with the shortest days is December (Average daylight: 6h and 36min).

  • Average sunshine in September: 5h and 5min

The month with the most sunshine is July (Average sunshine: 8h and 18min).
The months with the least sunshine are January and December (Average sunshine: 2h and 36min).

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Average sunshine days in September
Kodiak, AK

Average sunshine days in September - Kodiak, AK
  • Average sunshine days in September: 11.5 days

The month with the most sunshine days is July (14.7 days).
The month with the least sunshine days is April (10.7 days).

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Average UV index in September
Kodiak, AK

Average UV index in September - Kodiak, AK
  • Average UV index in September: 3

The months with the highest UV index are June, July, August and September (UV index 3).
The month with the lowest UV index is January (UV index 1).

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Average cloud cover in September
Kodiak, AK

Average cloud cover in September - Kodiak, AK
  • Average cloud cover in September: 52

The month with the most cloud cover is January (Cloud cover 63).
The month with the least cloud cover is September (Cloud cover 52).

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Average visibility in September
Kodiak, AK

Average visibility in September - Kodiak, AK
  • Average visibility in September: 6mi

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

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Kodiak, Alaska, USA

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