September weather forecastDouglas, AK
September
Weather in September
The first month of the autumn, September, is also a frosty month in Douglas, Alaska, with an average temperature ranging between min 39.7°F (4.3°C) and max 48.2°F (9°C).Temperature
With the commencement of September, Douglas records a moderate temperature decline, with the average high easing from August's cool 54.1°F (12.3°C) to a chilly 48.2°F (9°C). Douglas notes a consistent average low-temperature of 39.7°F (4.3°C) during September nights.Humidity
In Douglas, the average relative humidity in September is 90%.Rainfall
In Douglas, in September, it is raining for 21.9 days, with typically 8.27" (210mm) of accumulated precipitation. In Douglas, during the entire year, the rain falls for 172.4 days and collects up to 85.87" (2181mm) of precipitation.Snowfall
June through September are months without snowfall.Daylight
The average length of the day in September is 12h and 46min.On the first day of September, sunrise is at 5:59 am and sunset at 7:55 pm. On the last day of the month, sunrise is at 7:01 am and sunset at 6:32 pm AKDT.
Sunshine
In September, the average sunshine is 4.9h.UV index
In September, the average daily maximum UV index is 2. A UV Index reading of 2, and below, represents a low health risk from exposure to the Sun's UV radiation for average individuals.Note: In September, an average UV index of 2 transforms into the following instructions:
Children, infants, and individuals with sensitive skin should be constantly protected from extended sun exposure. The Sun is most powerful around mid-day, so it's a good practice to reduce direct exposure. Sun-related eye harm can be minimized with proper sunglasses offering UVA and UVB coverage.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Douglas, AK
- Average high temperature in September: 48.2°F
The warmest month (with the highest average high temperature) is July (55.8°F).
The months with the lowest average high temperature are January and December (25.7°F).
- Average low temperature in September: 39.7°F
The month with the highest average low temperature is July (45.1°F).
The coldest month (with the lowest average low temperature) is February (17.1°F).
Average pressure in September
Douglas, AK
- Average pressure in September: 29.89"Hg
The month with the highest atmospheric pressure is July (30.03"Hg).
The month with the lowest atmospheric pressure is November (29.8"Hg).
Average wind speed in September
Douglas, AK
- Average wind speed in September: 5.2mph
The windiest month (with the highest average wind speed) is January (6.9mph).
The calmest months (with the lowest average wind speed) are June and July (3.7mph).
Average humidity in September
Douglas, AK
- Average humidity in September: 90%
The month with the highest relative humidity is January (92%).
The month with the lowest relative humidity is May (86%).
Average rainfall in September
Douglas, AK
- Average rainfall in September: 8.27"
The wettest month (with the highest rainfall) is October (9.88").
The driest month (with the least rainfall) is May (4.13").
Average rainfall days in September
Douglas, AK
- Average rainfall days in September: 21.9 days
The month with the highest number of rainy days is September (21.9 days).
The month with the least rainy days is February (4.8 days).
Average snowfall in September
Douglas, AK
- Average snowfall in September: 0"
The month with the highest snowfall is December (62.8").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in September
Douglas, AK
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (21.9 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Douglas, AK
- Average daylight in September: 12h and 48min
The month with the longest days is June (Average daylight: 18h and 6min).
The month with the shortest days is December (Average daylight: 6h and 30min).
- Average sunshine in September: 4h and 54min
The month with the most sunshine is June (Average sunshine: 6h and 24min).
The month with the least sunshine is November (Average sunshine: 2h and 36min).
Average sunshine days in September
Douglas, AK
- Average sunshine days in September: 7.5 days
The month with the most sunshine days is May (10 days).
The month with the least sunshine days is November (6.1 days).
Average UV index in September
Douglas, AK
- Average UV index in September: 2
The months with the highest UV index are May and July (UV index 3).
The months with the lowest UV index are January, April, October, November and December (UV index 1).
Average cloud cover in September
Douglas, AK
- Average cloud cover in September: 67
The months with the most cloud cover are January and November (Cloud cover 72).
The month with the least cloud cover is May (Cloud cover 61).
Average visibility in September
Douglas, AK
- Average visibility in September: 4mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (4mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (4mi).
