September weather forecast
Whittier, AK

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Weather in September

As the bridge between August's lingering summer and the upcoming winter, September brings noticeable change to Whittier's weather patterns. A considerable drop in sunshine hours and temperatures indicates the end of the bright and warm period. Nevertheless, September retains its charm with outdoor-friendly weather and minimal humidity. Rainfall and cloud cover notably increase, making the highest amount of rainfall of 9.84" (250mm) in the month. September fosters a blend of diverse weather conditions, making it a unique time to visit Whittier.

Temperature

Whittier observes a small decrease in the average high-temperature with the arrival of September, falling from August's fresh 52.2°F (11.2°C) to a frosty 44.4°F (6.9°C). Whittier experiences an average nighttime temperature of 37.2°F (2.9°C) in September, reflecting a minor difference from the day's peak.

Humidity

In September, the average relative humidity in Whittier is 89%.

Rainfall

In Whittier, during September, the rain falls for 22.3 days and regularly aggregates up to 9.84" (250mm) of precipitation. In Whittier, Alaska, during the entire year, the rain falls for 199.9 days and collects up to 94.88" (2410mm) of precipitation.

Snowfall

January through May, September through December are months with snowfall in Whittier. September is the first month it typically snows in Whittier. Throughout September, in the average 0.3 snowfall days, it receives 0.12" (3mm) of snow. In Whittier, during the entire year, snow falls for 111.4 days and aggregates up to 193.66" (4919mm) of snow.

Daylight

In Whittier, the average length of the day in September is 12h and 51min.
On the first day of the month, sunrise is at 6:50 am and sunset at 8:58 pm. On the last day of September, sunrise is at 8:00 am and sunset at 7:28 pm AKDT.

Sunshine

The average sunshine in September is 4.5h.

UV index

In September, the average daily maximum UV index is 2. A UV Index of 2, and less, symbolizes a low threat to health from unprotected exposure to Sun's UV rays for the average person.
Note: A daily high UV index of 2 in September leads to these guidelines:
Prolonged sun exposure generally does not trouble most people. However, it is vital to ensure protection for babies, children, and individuals with sensitive skin. For skin protection, it's recommended to minimize Sun exposure during its peak hours around midday. Loose clothes with a tight weave are optimal for safeguarding yourself against the Sun's rays. Be vigilant! The reflective nature of snow can increase the Sun's UV radiation nearly twofold.
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Frequently asked questions

How cold is September in Whittier?

In September, the average high-temperature and low-temperature in Whittier are 44.4°F (6.9°C) and 37.2°F (2.9°C) respectively.

What is the average humidity in September in Whittier?

In Whittier, Alaska, the average relative humidity in September is 89%.

How many days does it rain in September in Whittier?

In September, in Whittier, Alaska, the rain falls for 22.3 days. Throughout September, 9.84" (250mm) of precipitation is accumulated.

When does it start to snow in Whittier?

September is the first month it typically snows in Whittier. Throughout September, in the average 0.3 snowfall days, it receives 0.12" (3mm) of snow.

How many hours of daylight does Whittier have in September?

The average day length in September in Whittier, Alaska, is 12h and 51min.

When is the sunrise / sunset in September in Whittier?

On the first day of September, sunrise is at 6:50 am and sunset at 8:58 pm. On the last day of the month, sunrise is at 8:00 am and sunset at 7:28 pm AKDT.

How many hours of sunshine does Whittier have in September?

The average sunshine duration in September in Whittier is 4.5h.

What is the UV index reading in September in Whittier?

In Whittier, the average daily maximum UV index in September is 2. A UV Index value of 2, and less, symbolizes a low health risk from exposure to the Sun's 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 September
Whittier, AK

Average temperature in September - Whittier, AK
  • Average high temperature in September: 44.4°F

The warmest month (with the highest average high temperature) is July (55°F).
The month with the lowest average high temperature is January (20.1°F).

  • Average low temperature in September: 37.2°F

The month with the highest average low temperature is July (44.1°F).
The coldest month (with the lowest average low temperature) is January (10.8°F).

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Average pressure in September
Whittier, AK

Average pressure in September - Whittier, AK
  • Average pressure in September: 29.75"Hg

The month with the highest atmospheric pressure is July (29.98"Hg).
The month with the lowest atmospheric pressure is November (29.65"Hg).

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Average wind speed in September
Whittier, AK

Average wind speed in September - Whittier, AK
  • Average wind speed in September: 4.9mph

The windiest month (with the highest average wind speed) is November (6.1mph).
The calmest month (with the lowest average wind speed) is July (4.1mph).

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Average humidity in September
Whittier, AK

Average humidity in September - Whittier, AK
  • Average humidity in September: 89%

The months with the highest relative humidity are March and April (92%).
The month with the lowest relative humidity is June (82%).

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Average rainfall in September
Whittier, AK

Average rainfall in September - Whittier, AK
  • Average rainfall in September: 9.84"

The wettest month (with the highest rainfall) is October (12.13").
The driest month (with the least rainfall) is June (3.9").

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Average rainfall days in September
Whittier, AK

Average rainfall days in September - Whittier, AK
  • Average rainfall days in September: 22.3 days

The month with the highest number of rainy days is August (23.8 days).
The month with the least rainy days is February (7.7 days).

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Average snowfall in September
Whittier, AK

Average snowfall in September - Whittier, AK
  • Average snowfall in September: 0.12"

The month with the highest snowfall is December (46.38").
The months with the least snowfall are June, July and August (0").

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Average snowfall days in September
Whittier, AK

Average snowfall days in September - Whittier, AK
  • Average snowfall days in September: 0.3 days

The month with the highest number of snowfall days is December (21.9 days).
The months with the least snowfall days are June, July and August (0 days).

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

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

The month with the longest days is June (Average daylight: 19h and 0min).
The month with the shortest days is December (Average daylight: 5h and 48min).

  • Average sunshine in September: 4h and 3min

The month with the most sunshine is June (Average sunshine: 8h and 0min).
The month with the least sunshine is December (Average sunshine: 2h and 0min).

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Average sunshine days in September
Whittier, AK

Average sunshine days in September - Whittier, AK
  • Average sunshine days in September: 5.8 days

The month with the most sunshine days is January (9.3 days).
The month with the least sunshine days is April (5.6 days).

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Average UV index in September
Whittier, AK

Average UV index in September - Whittier, AK
  • Average UV index in September: 2

The months with the highest UV index are June and July (UV index 3).
The months with the lowest UV index are January, February, April, October, November and December (UV index 1).

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Average cloud cover in September
Whittier, AK

Average cloud cover in September - Whittier, AK
  • Average cloud cover in September: 68

The month with the most cloud cover is December (Cloud cover 71).
The months with the least cloud cover are March and June (Cloud cover 60).

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Average visibility in September
Whittier, AK

Average visibility in September - Whittier, AK
  • Average visibility in September: 4mi

The months with the highest visibility are May, June and July (5mi).
The months with the lowest visibility are January, February, March, April, August, September, October, November and December (4mi).

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Whittier, Alaska, USA

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