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
The arrival of September signals a subtle shift in temperature, down from a refreshing 60.3°F (15.7°C) in August to a fresh 52.5°F (11.4°C). During September, the average low-temperature is recorded at a wintry 40.5°F (4.7°C).Humidity
In September, the average relative humidity is 77%.Rainfall
The month with the most rainfall is September, when the rain falls for 15.9 days and typically aggregates up to 1.81" (46mm) 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 0.08" (2mm) of snow. Throughout the year, there are 57.9 snowfall days, and 24.37" (619mm) of snow is accumulated.Daylight
The average length of the day in September is 12h and 52min.On the first day of September, sunrise is at 6:51 am and sunset at 9:03 pm. On the last day of the month, sunrise is at 8:04 am and sunset at 7:30 pm AKDT.
Sunshine
In Birchwood, the average sunshine in September is 7.9h.UV index
The average daily maximum UV index in September is 2. A UV Index estimate of 2, and below, represents a minimal health hazard from exposure to the Sun's UV rays for ordinary individuals.Note: The UV index of 2 during September leads to these advisories:
Babies, children, and those with sensitive skin should always avoid extended periods in the sun. To prevent harmful UV exposure, minimize direct contact with the Sun around midday. Safeguard your eyes, ears, and face from sun rays with the aid of a wide-brim hat. Beware! Reflection from snow can magnify the Sun's UV radiation nearly twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in Birchwood in September?
What is the average humidity in September?
What is the wettest month?
How many days does it rain in September?
When does it start snowing?
What is the average length of the day in September?
When are sunrise and sunset in September in Birchwood?
How long on average sun shines in September?
What is the UV index reading in September?
Average temperature in September
Birchwood, AK
- Average high temperature in September: 52.5°F
The warmest month (with the highest average high temperature) is July (63.1°F).
The month with the lowest average high temperature is January (19°F).
- Average low temperature in September: 40.5°F
The month with the highest average low temperature is July (48.4°F).
The coldest month (with the lowest average low temperature) is January (9.7°F).
Average pressure in September
Birchwood, 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 (29.69"Hg).
Average wind speed in September
Birchwood, AK
- Average wind speed in September: 4.3mph
The windiest months (with the highest average wind speed) are January and December (4.6mph).
The calmest month (with the lowest average wind speed) is July (4.1mph).
Average humidity in September
Birchwood, AK
- Average humidity in September: 77%
The months with the highest relative humidity are February and March (87%).
The month with the lowest relative humidity is May (65%).
Average rainfall in September
Birchwood, AK
- Average rainfall in September: 1.81"
The wettest month (with the highest rainfall) is September (1.81").
The driest month (with the least rainfall) is May (0.63").
Average rainfall days in September
Birchwood, AK
- Average rainfall days in September: 15.9 days
The month with the highest number of rainy days is August (18.3 days).
The month with the least rainy days is January (7.4 days).
Average snowfall in September
Birchwood, AK
- Average snowfall in September: 0.08"
The month with the highest snowfall is December (5.98").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
Birchwood, AK
- Average snowfall days in September: 0.3 days
The month with the highest number of snowfall days is February (11.3 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Birchwood, AK
- Average daylight in September: 12h and 5min
The month with the longest days is June (Average daylight: 19h and 18min).
The month with the shortest days is December (Average daylight: 5h and 36min).
- Average sunshine in September: 7h and 5min
The month with the most sunshine is May (Average sunshine: 11h and 54min).
The month with the least sunshine is December (Average sunshine: 3h and 54min).
Average sunshine days in September
Birchwood, AK
- Average sunshine days in September: 10.5 days
The month with the most sunshine days is January (17.2 days).
The month with the least sunshine days is August (10.2 days).
Average UV index in September
Birchwood, AK
- Average UV index in September: 2
The months with the highest UV index are June and July (UV index 4).
The month with the lowest UV index is February (UV index 1).
Average cloud cover in September
Birchwood, AK
- Average cloud cover in September: 42
The months with the most cloud cover are April, August and December (Cloud cover 44).
The month with the least cloud cover is May (Cloud cover 37).
Average visibility in September
Birchwood, 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).
Birchwood, Alaska, USA
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