Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
In September, the meteorological conditions change slightly, with the average high-temperature moving from a comfortable 63.7°F (17.6°C) in August to a cool 54.9°F (12.7°C). Willow's temperature drops to an average low of 41.2°F (5.1°C) during the nights of September.Humidity
In September, the average relative humidity is 77%.Rainfall
September is the month with the most rainfall. Rain falls for 16 days and accumulates 2.13" (54mm) of precipitation.Snowfall
January through May, September through December are months with snowfall. September is the first month it typically snows. Throughout September, in the average 0.3 snowfall days, it receives 0.2" (5mm) of snow. Throughout the year, there are 56.9 snowfall days, and 26.54" (674mm) of snow is accumulated.Daylight
In Willow, the average length of the day in September is 12h and 53min.On the first day of September, sunrise is at 6:52 am and sunset at 9:06 pm. On the last day of the month, sunrise is at 8:06 am and sunset at 7:32 pm AKDT.
Sunshine
The average sunshine in September is 7.4h.UV index
The average daily maximum UV index in September in Willow is 2. A UV Index of 2, and less, symbolizes a minimal health vulnerability from unprotected exposure to Sun's UV rays for average individuals.Note: A maximum high daily UV index of 2 during September translates into the following directions:
Most people face no serious problems with extended sun exposure, but those with fair skin, infants, and children always need protection. Exposing oneself to the midday Sun can be harmful due to the strong UV radiation; limit your time outside. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Bear in mind! The Sun's UV radiation can nearly double in intensity due to the reflective quality of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in September?
What is the average humidity in September?
What is the wettest month?
How much does it rain in September?
When does it start snowing?
How many hours of daylight does Willow have in September?
When are sunrise and sunset in September?
How long on average sun shines in September?
What is the UV index intensity in September?
Average temperature in September
Willow, AK
- Average high temperature in September: 54.9°F
The warmest month (with the highest average high temperature) is July (67.6°F).
The month with the lowest average high temperature is January (17.8°F).
- Average low temperature in September: 41.2°F
The month with the highest average low temperature is July (50.4°F).
The coldest month (with the lowest average low temperature) is January (8.6°F).
Average pressure in September
Willow, AK
- Average pressure in September: 29.75"Hg
The month with the highest atmospheric pressure is July (29.96"Hg).
The months with the lowest atmospheric pressure are November and December (29.7"Hg).
Average wind speed in September
Willow, AK
- Average wind speed in September: 4.5mph
The windiest month (with the highest average wind speed) is November (5.1mph).
The calmest month (with the lowest average wind speed) is April (4.3mph).
Average humidity in September
Willow, AK
- Average humidity in September: 77%
The month with the highest relative humidity is March (89%).
The month with the lowest relative humidity is May (61%).
Average rainfall in September
Willow, AK
- Average rainfall in September: 2.13"
The wettest month (with the highest rainfall) is September (2.13").
The driest month (with the least rainfall) is April (0.63").
Average rainfall days in September
Willow, AK
- Average rainfall days in September: 16 days
The month with the highest number of rainy days is August (19.3 days).
The month with the least rainy days is February (4.8 days).
Average snowfall in September
Willow, AK
- Average snowfall in September: 0.2"
The month with the highest snowfall is December (5.87").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
Willow, AK
- Average snowfall days in September: 0.3 days
The month with the highest number of snowfall days is December (11.4 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Willow, AK
- Average daylight in September: 12h and 5min
The month with the longest days is June (Average daylight: 19h and 30min).
The month with the shortest days is December (Average daylight: 5h and 24min).
- Average sunshine in September: 7h and 2min
The month with the most sunshine is May (Average sunshine: 11h and 24min).
The month with the least sunshine is December (Average sunshine: 3h and 42min).
Average sunshine days in September
Willow, AK
- Average sunshine days in September: 11.8 days
The month with the most sunshine days is November (18.5 days).
The month with the least sunshine days is August (9.7 days).
Average UV index in September
Willow, AK
- Average UV index in September: 2
The months with the highest UV index are May, June and July (UV index 4).
The months with the lowest UV index are January, February and December (UV index 1).
Average cloud cover in September
Willow, AK
- Average cloud cover in September: 46
The months with the most cloud cover are April and August (Cloud cover 48).
The month with the least cloud cover is January (Cloud cover 40).
Average visibility in September
Willow, AK
- Average visibility in September: 6mi
The months with the highest visibility are May, June, July, August, September, October and November (6mi).
The month with the lowest visibility is March (4mi).
Willow, Alaska, USA
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