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
With September's onset, the average high-temperature recedes from August's moderately hot 77.2°F (25.1°C) to a refreshing 66.9°F (19.4°C). An average low-temperature of 45.7°F (7.6°C) is noted in Hailey during the month of September.Humidity
In Hailey, Idaho, the average relative humidity in September is 41%.Rainfall
In Hailey, in September, during 4.2 rainfall days, 0.28" (7mm) of precipitation is typically accumulated. Throughout the year, there are 85.1 rainfall days, and 12.01" (305mm) 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 0.2 snowfall days, it receives 0.08" (2mm) of snow. In Hailey, during the entire year, snow falls for 72.5 days and aggregates up to 57.05" (1449mm) of snow.Daylight
In Hailey, the average length of the day in September is 12h and 29min.On the first day of the month, sunrise is at 7:02 am and sunset at 8:11 pm. On the last day of September, sunrise is at 7:34 am and sunset at 7:19 pm MDT.
Sunshine
In September, the average sunshine is 9.5h.UV index
In Hailey, Idaho, the average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a medium health hazard from exposure to the Sun's UV rays for the average person.Note: In September, a daily UV index of 4 turns into the following recommendations:
Safety measures are advised. Light-skinned individuals may experience burns in under half an hour. To avoid the Sun's strongest rays, limit exposure around the mid-day period. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days. Watch out! The Sun's UV radiation can be nearly magnified twofold due to snow reflection.
Frequently asked questions
What are the temperatures in Hailey in September?
What is the average humidity in September in Hailey?
How much does it rain in Hailey in September?
When does it start snowing in Hailey?
What is the average length of the day in September in Hailey?
When is the sunrise / sunset in September in Hailey?
How many hours of sunshine does Hailey have in September?
What is the UV index intensity in September in Hailey?
Average temperature in September
Hailey, ID
- Average high temperature in September: 66.9°F
The warmest month (with the highest average high temperature) is July (77.7°F).
The month with the lowest average high temperature is December (25.7°F).
- Average low temperature in September: 45.7°F
The months with the highest average low temperature are July and August (52.3°F).
The coldest month (with the lowest average low temperature) is January (9.5°F).
Average pressure in September
Hailey, ID
- Average pressure in September: 29.95"Hg
The month with the highest atmospheric pressure is January (30.28"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).
Average wind speed in September
Hailey, ID
- Average wind speed in September: 6.4mph
The windiest month (with the highest average wind speed) is July (7.3mph).
The calmest month (with the lowest average wind speed) is December (4.7mph).
Average humidity in September
Hailey, ID
- Average humidity in September: 41%
The month with the highest relative humidity is February (86%).
The month with the lowest relative humidity is August (34%).
Average rainfall in September
Hailey, ID
- Average rainfall in September: 0.28"
The wettest month (with the highest rainfall) is February (1.77").
The driest month (with the least rainfall) is July (0.2").
Average rainfall days in September
Hailey, ID
- Average rainfall days in September: 4.2 days
The month with the highest number of rainy days is May (12.8 days).
The month with the least rainy days is August (3.4 days).
Average snowfall in September
Hailey, ID
- Average snowfall in September: 0.08"
The month with the highest snowfall is February (13.74").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
Hailey, ID
- Average snowfall days in September: 0.2 days
The month with the highest number of snowfall days is December (14.2 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in September /
Average sunshine in September
Hailey, ID
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 24min).
The month with the shortest days is December (Average daylight: 9h and 0min).
- Average sunshine in September: 9h and 3min
The month with the most sunshine is July (Average sunshine: 12h and 6min).
The month with the least sunshine is January (Average sunshine: 5h and 36min).
Average sunshine days in September
Hailey, ID
- Average sunshine days in September: 24.6 days
The month with the most sunshine days is August (25.8 days).
The month with the least sunshine days is April (12.4 days).
Average UV index in September
Hailey, ID
- Average UV index in September: 4
The month with the highest UV index is July (UV index 6).
The month with the lowest UV index is February (UV index 1).
Average cloud cover in September
Hailey, ID
- Average cloud cover in September: 14
The month with the most cloud cover is February (Cloud cover 44).
The month with the least cloud cover is July (Cloud cover 9).
Average visibility in September
Hailey, ID
- Average visibility in September: 6mi
The months with the highest visibility are April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January and February (4mi).
Hailey, Idaho, USA
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