September weather forecast and climate
Sitka, AK

The glacial carved Three Sisters Mountains in Sitka, Alaska
The glacial carved Three Sisters Mountains in Sitka, Alaska

Weather in September

The first month of the autumn, September, is still a cool month in Sitka, Alaska, with average temperature fluctuating between 54.1°F (12.3°C) and 47.5°F (8.6°C).

Temperature

In Sitka, Alaska, the average high-temperature in September is practically the same as in August - a cool 54.1°F (12.3°C). The average low-temperature, in September, is 47.5°F (8.6°C).

Humidity

In September, the average relative humidity is 87%.

Rainfall

In Sitka, during September, the rain falls for 21.7 days and regularly aggregates up to 7.91" (201mm) of precipitation. Throughout the year, there are 243.6 rainfall days, and 82.76" (2102mm) of precipitation is accumulated.

Snowfall

June through September are months without snowfall.

Daylight

In September, the average length of the day is 12.7h.

Sunshine

The average sunshine in Sitka, Alaska, is 5.9h.

UV index

The average daily maximum UV index in Sitka is 3. A UV Index estimate of 3 to 5 represents a medium vulnerability from the exposure to the Sun's UV radiation for average individuals.
Note: The average daily UV index of 3 transform into the following instructions:
Take precautions - Protection against sunburn is recommended. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.
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FAQ

What is the temperature in September in Sitka?

In September, the average high-temperature is 54.1°F (12.3°C), and the average low-temperature is 47.5°F (8.6°C).

What is the average humidity in September in Sitka?

In Sitka, the average relative humidity in September is 87%.

How much does it rain in Sitka in September?

In September, the rain falls for 21.7 days. Throughout September, 7.91" (201mm) of precipitation is accumulated.

Does it snow in Sitka in September?

In Sitka, in September, it doesn't snow. In October, it regularly snows.

When it does not snow in Sitka?

June through September are months without snowfall in Sitka, Alaska.

What is the average length of the day in September in Sitka?

In Sitka, the average length of the day in September is 12.7h.

How many hours of sunshine does Sitka have in September?

In September, the average sunshine in Sitka is 5.9h.

What is the UV index intensity in September in Sitka?

In September, the average daily maximum UV index in Sitka is 3. A UV Index of 3 to 5 symbolizes a medium hazard to health from unprotected exposure to the UV radiation.

Average temperature in September
Sitka, AK

Average temperature in September - Sitka, AK
  • Average high temperature in September: 54.1°F

The warmest month (with the highest average high temperature) is August (57.9°F).
The month with the lowest average high temperature is January (34.7°F).

  • Average low temperature in September: 47.5°F

The month with the highest average low temperature is August (51.1°F).
The coldest month (with the lowest average low temperature) is February (29.7°F).

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Average pressure in September
Sitka, AK

Average pressure in September - Sitka, AK
  • Average pressure in September: 29.88"

The month with the highest atmospheric pressure is July (30.05").
The month with the lowest atmospheric pressure is November (29.72").

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Average wind speed in September
Sitka, AK

Average wind speed in September - Sitka, AK
  • Average wind speed in September: 7mph

The windiest month (with the highest average wind speed) is January (9.8mph).
The calmest month (with the lowest average wind speed) is July (5.2mph).

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Average humidity in September
Sitka, AK

Average humidity in September - Sitka, AK
  • Average humidity in September: 87%

The month with the highest relative humidity is August (89%).
Months with the lowest relative humidity are February and March (83%).

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Average rainfall in September
Sitka, AK

Average rainfall in September - Sitka, AK
  • Average rainfall in September: 7.91"

The wettest month (with the highest rainfall) is November (10.16").
The driest month (with the least rainfall) is May (3.82").

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Average rainfall days in September
Sitka, AK

Average rainfall days in September - Sitka, AK
  • Average rainfall days in September: 21.7 days

The month with the highest number of rainy days is October (23.5 days).
The month with the least rainy days is February (14.6 days).

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Average snowfall in September
Sitka, AK

Average snowfall in September - Sitka, AK
  • Average snowfall in September: 0"

The month with the highest snowfall is March (17.72").
Months with the least snowfall are June, July, August and September (0").

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Average snowfall days in September
Sitka, AK

Average snowfall days in September - Sitka, AK
  • Average snowfall days in September: 0 days

The month with the highest number of snowfall days is March (14.1 days).
Months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in September / Average sunshine in September - Sitka, AK
  • Average daylight in September: 12.7h

The month with the longest days is June (Average daylight: 17.8h).
The month with the shortest days is December (Average daylight: 6.8h).

  • Average sunshine in September: 5.9h

The month with the most sunshine is May (Average sunshine: 6.5h).
The month with the least sunshine is January (Average sunshine: 2.7h).

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Average sunshine days in September
Sitka, AK

Average sunshine days in September - Sitka, AK
  • Average sunshine days in September: 7.4 days

The month with the most sunshine days is May (8.8 days).
The month with the least sunshine days is June (4.8 days).

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Average UV index in September
Sitka, AK

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

The month with the highest UV index is July (UV index 4).
Months with the lowest UV index are January, November and December (UV index 1).

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Average cloud cover in September
Sitka, AK

Average cloud cover in September - Sitka, AK
  • Average cloud cover in September: 60

The month with the most cloud cover is January (Cloud cover 72).
Months with the least cloud cover are February, May and September (Cloud cover 60).

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Average visibility in September
Sitka, AK

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

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

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