September weather forecastWhittier, AK
September
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
September implies a soft temperature shift, with average high-temperatures reducing from August's cool 52.2°F (11.2°C) to a chilly 44.4°F (6.9°C). Whittier records a negligible downturn from daytime temperatures, averaging a low of 37.2°F (2.9°C) in the month of September.Humidity
In September, the average relative humidity in Whittier is 89%.Rainfall
In September, the rain falls for 22.3 days. Throughout September, 9.84" (250mm) of precipitation is accumulated. Throughout the year, there are 199.9 rainfall days, and 94.88" (2410mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through May, September through December. September is the first month it typically snows. Throughout September, in the average 0.3 snowfall days, it receives 0.12" (3mm) of snow. Throughout the year, there are 111.4 snowfall days, and 193.66" (4919mm) of snow is accumulated.Daylight
In Whittier, the average length of the day in September is 12h and 51min.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.
Sunshine
In September, the average sunshine is 4.5h.UV index
The average daily maximum UV index in September is 2. A UV Index reading of 2, and below, represents a low health risk from unsafe exposure to UV radiation for ordinary individuals.Note: In September, a regular UV index of 2 translates into these guidelines:
While most can endure approximately an hour in the sun without burning, children always require protection from sunlight. Direct Sun exposure should be minimized especially during midday when radiation is most intense. Always opt for UVA and UVB-resistant sunglasses on radiant days. Alert! The snow's reflection can amplify the UV radiation of the Sun nearly twice.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
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).
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).
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).
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%).
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").
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).
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").
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).
Average daylight in September /
Average sunshine in September
Whittier, AK
- Average daylight in September: 12h and 48min
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 30min
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).
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).
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).
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).
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).
