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 Birchwood, the average high-temperature in September gently drops from a mild 60.3°F (15.7°C) in August to a cool 52.5°F (11.4°C). An average nighttime temperature of 40.5°F (4.7°C) is noted in Birchwood during the month of September.Humidity
In September, the average relative humidity is 77%.Rainfall
September is the month with the most rainfall. Rain falls for 15.9 days and accumulates 1.81" (46mm) of precipitation.Snowfall
January through May, September through December are months with snowfall. September is the first month it typically snows in Birchwood, Alaska. Throughout September, in the average 0.3 snowfall days, it receives 0.08" (2mm) of snow. In Birchwood, during the entire year, snow falls for 57.9 days and aggregates up to 24.37" (619mm) of snow.Daylight
In September, the average length of the day in Birchwood 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
In Birchwood, the average daily maximum UV index in September is 2. A UV Index of 2, and less, symbolizes a low threat to health from unsafe exposure to UV radiation for average individuals.Note: The maximum UV index, 2 during September, leads to the following recommendations:
Babies, children, and those with sensitive skin should always avoid extended periods in the sun. The Sun is most powerful around mid-day, so it's a good practice to reduce direct exposure. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation. Mind you! Snow reflection can increase the intensity of the Sun's UV radiation nearly twofold.
Frequently asked questions
What are the temperatures in Birchwood in September?
What is the average humidity in September in Birchwood?
What is the wettest month in Birchwood?
How much does it rain in Birchwood in September?
When does it start snowing in Birchwood?
What is the average length of the day in September in Birchwood?
What time are sunrise and sunset in September in Birchwood?
How many hours of sunshine does Birchwood have in September?
What is the UV index reading in September in Birchwood?
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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