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 Clam Gulch, the average high-temperature in September slightly decreases from a refreshing 59.4°F (15.2°C) in August to a fresh 52.5°F (11.4°C). Throughout September, Clam Gulch's nights experience a slight temperature dip to a frosty 43.5°F (6.4°C).Humidity
The average relative humidity in September is 81%.Rainfall
In September, the rain falls for 19.7 days. Throughout September, 3.31" (84mm) of precipitation is accumulated. Throughout the year, there are 167.3 rainfall days, and 24.65" (626mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through May, September through December. September is the first month it typically snows. Throughout September, in the average 0.4 snowfall days, it receives 0.35" (9mm) of snow. Throughout the year, there are 80.3 snowfall days, and 44.88" (1140mm) of snow is accumulated.Daylight
In Clam Gulch, the average length of the day in September is 12h and 50min.On the first day of the month, sunrise is at 7:02 am and sunset at 9:08 pm. On the last day of September, sunrise is at 8:11 am and sunset at 7:39 pm AKDT.
Sunshine
The average sunshine in September is 6.4h.UV index
In Clam Gulch, the average daily maximum UV index in September is 2. A UV Index value of 2, and less, symbolizes a low threat to health from exposure to the Sun's UV rays for average individuals.Note: An average maximum UV index of 2 in September leads to these recommendations:
Most individuals face no major issues with lengthy exposure to the sun, but children, infants, and individuals with fair skin always require protection. Direct exposure to the Sun's intense radiation around midday should be avoided for health reasons. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses. Mind this! Nearly twice the UV radiation from the Sun can be reflected by the snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are September temperatures?
What is the average humidity in September?
How much does it rain in September?
When does it start to snow?
How many hours of daylight does Clam Gulch have in September?
What time are sunrise and sunset in September?
How many hours of sunshine does Clam Gulch have in September?
What is the UV index reading in September?
Average temperature in September
Clam Gulch, AK
- Average high temperature in September: 52.5°F
The warmest month (with the highest average high temperature) is July (61.2°F).
The month with the lowest average high temperature is January (23.4°F).
- Average low temperature in September: 43.5°F
The month with the highest average low temperature is July (50.2°F).
The coldest month (with the lowest average low temperature) is January (17.6°F).
Average pressure in September
Clam Gulch, AK
- Average pressure in September: 29.72"Hg
The month with the highest atmospheric pressure is July (29.96"Hg).
The months with the lowest atmospheric pressure are November and December (29.63"Hg).
Average wind speed in September
Clam Gulch, AK
- Average wind speed in September: 6.3mph
The windiest months (with the highest average wind speed) are January, November and December (8mph).
The calmest month (with the lowest average wind speed) is July (5.7mph).
Average humidity in September
Clam Gulch, AK
- Average humidity in September: 81%
The months with the highest relative humidity are January and February (89%).
The month with the lowest relative humidity is May (70%).
Average rainfall in September
Clam Gulch, AK
- Average rainfall in September: 3.31"
The wettest month (with the highest rainfall) is October (3.39").
The driest months (with the least rainfall) are March and May (1.34").
Average rainfall days in September
Clam Gulch, AK
- Average rainfall days in September: 19.7 days
The month with the highest number of rainy days is September (19.7 days).
The month with the least rainy days is February (7.4 days).
Average snowfall in September
Clam Gulch, AK
- Average snowfall in September: 0.35"
The month with the highest snowfall is December (10.43").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
Clam Gulch, AK
- Average snowfall days in September: 0.4 days
The month with the highest number of snowfall days is December (15.6 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Clam Gulch, AK
- Average daylight in September: 12h and 5min
The month with the longest days is June (Average daylight: 18h and 48min).
The month with the shortest days is December (Average daylight: 6h and 0min).
- Average sunshine in September: 6h and 2min
The month with the most sunshine is June (Average sunshine: 10h and 6min).
The month with the least sunshine is December (Average sunshine: 3h and 6min).
Average sunshine days in September
Clam Gulch, AK
- Average sunshine days in September: 8.9 days
The months with the most sunshine days are January and March (13.2 days).
The month with the least sunshine days is September (8.9 days).
Average UV index in September
Clam Gulch, AK
- Average UV index in September: 2
The months with the highest UV index are June and July (UV index 4).
The months with the lowest UV index are February and October (UV index 1).
Average cloud cover in September
Clam Gulch, AK
- Average cloud cover in September: 50
The month with the most cloud cover is December (Cloud cover 56).
The months with the least cloud cover are June and July (Cloud cover 46).
Average visibility in September
Clam Gulch, AK
- Average visibility in September: 6mi
The months with the highest visibility are May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February, March, April and December (5mi).
Clam Gulch, Alaska, USA
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