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
September's arrival coincides with a soft drop in the average high-temperature, subtly decreasing from August's fresh 53.4°F (11.9°C) to a chilly 45.5°F (7.5°C). An average low-temperature of 36.3°F (2.4°C) is observed in Girdwood, Alaska, during the September nights.Humidity
In September, the average relative humidity is 87%.Rainfall
In September, the rain falls for 18.7 days. Throughout September, 2.32" (59mm) of precipitation is accumulated. In Girdwood, Alaska, during the entire year, the rain falls for 158.6 days and collects up to 23.62" (600mm) of precipitation.Snowfall
Months with snowfall in Girdwood are January through May, September through December. September is the first month it typically snows. Throughout September, in the average 0.2 snowfall days, it receives 0.12" (3mm) of snow. In Girdwood, Alaska, during the entire year, snow falls for 92.4 days and aggregates up to 43.31" (1100mm) of snow.Daylight
In September, the average length of the day is 12h and 51min.On the first day of the month, sunrise is at 6:51 am and sunset at 9:01 pm. On the last day of September, sunrise is at 8:02 am and sunset at 7:29 pm AKDT.
Sunshine
The average sunshine in September is 5h.UV index
The average daily maximum UV index in September in Girdwood is 2. A UV Index reading of 2, and below, represents a low threat to health from unsafe exposure to UV radiation for average individuals.Note: The UV index of 2 during September translates into the following guidance:
Extended exposure to the sun should always be avoided by children, infants, and those with sensitive skin. Solar radiation peaks around mid-day, so it's wise to limit exposure to the Sun at this time. For excellent sun protection for the eyes, ears, face, and neck, consider a wide-brim hat. Keep in mind! Snow's reflective quality can nearly double the intensity of the Sun's UV radiation.
Frequently asked questions
What are the temperatures in Girdwood in September?
What is the average humidity in September in Girdwood?
How much does it rain in Girdwood in September?
When does it start snowing in Girdwood?
What is the average length of the day in September in Girdwood?
What time are sunrise and sunset in September in Girdwood?
How many hours of sunshine does Girdwood have in September?
How high is the UV index in September in Girdwood?
Average temperature in September
Girdwood, AK
- Average high temperature in September: 45.5°F
The warmest month (with the highest average high temperature) is July (56.8°F).
The month with the lowest average high temperature is January (18°F).
- Average low temperature in September: 36.3°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 (7.5°F).
Average pressure in September
Girdwood, AK
- Average pressure in September: 29.75"Hg
The month with the highest atmospheric pressure is July (29.97"Hg).
The month with the lowest atmospheric pressure is November (29.66"Hg).
Average wind speed in September
Girdwood, AK
- Average wind speed in September: 5.4mph
The windiest months (with the highest average wind speed) are November and December (5.9mph).
The calmest month (with the lowest average wind speed) is July (4.7mph).
Average humidity in September
Girdwood, AK
- Average humidity in September: 87%
The months with the highest relative humidity are March and December (92%).
The month with the lowest relative humidity is June (79%).
Average rainfall in September
Girdwood, AK
- Average rainfall in September: 2.32"
The wettest month (with the highest rainfall) is October (3.03").
The driest month (with the least rainfall) is January (1.14").
Average rainfall days in September
Girdwood, AK
- Average rainfall days in September: 18.7 days
The month with the highest number of rainy days is August (21.8 days).
The month with the least rainy days is February (6 days).
Average snowfall in September
Girdwood, AK
- Average snowfall in September: 0.12"
The month with the highest snowfall is December (9.57").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
Girdwood, AK
- Average snowfall days in September: 0.2 days
The month with the highest number of snowfall days is December (17.6 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Girdwood, AK
- Average daylight in September: 12h and 5min
The month with the longest days is June (Average daylight: 19h and 6min).
The month with the shortest days is December (Average daylight: 5h and 42min).
- Average sunshine in September: 5h and 0min
The month with the most sunshine is May (Average sunshine: 8h and 30min).
The month with the least sunshine is December (Average sunshine: 2h and 6min).
Average sunshine days in September
Girdwood, AK
- Average sunshine days in September: 9.7 days
The month with the most sunshine days is January (14.2 days).
The month with the least sunshine days is August (8 days).
Average UV index in September
Girdwood, 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, March, October, November and December (UV index 1).
Average cloud cover in September
Girdwood, AK
- Average cloud cover in September: 65
The month with the most cloud cover is December (Cloud cover 70).
The month with the least cloud cover is May (Cloud cover 55).
Average visibility in September
Girdwood, AK
- Average visibility in September: 5mi
The month with the highest visibility is June (6mi).
The months with the lowest visibility are January, February, March, April, October, November and December (4mi).
Girdwood, Alaska, USA
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