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
September brings a decrease in the average high-temperature, falling from August's moderately hot 79.3°F (26.3°C) to an agreeable 69.3°F (20.7°C). In the month of September, the average temperature dips to a frosty 49.6°F (9.8°C) during the night.Humidity
In Atomic City, the average relative humidity in September is 38%.Rainfall
In Atomic City, in September, it is raining for 8 days, with typically 0.71" (18mm) of accumulated precipitation. In Atomic City, during the entire year, the rain falls for 107.2 days and collects up to 10.31" (262mm) 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 0.2 snowfall days, it receives 0.16" (4mm) of snow. Throughout the year, there are 75.2 snowfall days, and 35.28" (896mm) of snow is accumulated.Daylight
In Atomic City, the average length of the day in September is 12h and 29min.On the first day of September, sunrise is at 6:56 am and sunset at 8:05 pm. On the last day of the month, sunrise is at 7:28 am and sunset at 7:13 pm MDT.
Sunshine
The average sunshine in September is 9.6h.UV index
In Atomic City, the average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a medium health hazard from exposure to the Sun's UV rays for the ordinary person.Note: A maximum UV index of 4 in September translates into the following recommendations:
Take precautions - Protection against sun damage is advised. 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. Take heed! The reflection of snow can intensify the Sun's UV radiation nearly double.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Atomic City in September?
What is the average humidity in September?
How much does it rain in September?
When does it start to snow?
What is the average length of the day in September?
When is the sunrise / sunset in September?
How long on average sun shines in September in Atomic City?
What is the UV index intensity in September?
Average temperature in September
Atomic City, ID
- Average high temperature in September: 69.3°F
The warmest month (with the highest average high temperature) is July (81.1°F).
The month with the lowest average high temperature is December (25.3°F).
- Average low temperature in September: 49.6°F
The month with the highest average low temperature is July (56.8°F).
The coldest month (with the lowest average low temperature) is January (10°F).
Average pressure in September
Atomic City, ID
- Average pressure in September: 29.96"Hg
The month with the highest atmospheric pressure is January (30.29"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed in September
Atomic City, ID
- Average wind speed in September: 6.8mph
The windiest month (with the highest average wind speed) is June (8mph).
The calmest month (with the lowest average wind speed) is January (4.7mph).
Average humidity in September
Atomic City, ID
- Average humidity in September: 38%
The month with the highest relative humidity is January (86%).
The months with the lowest relative humidity are July and August (32%).
Average rainfall in September
Atomic City, ID
- Average rainfall in September: 0.71"
The wettest month (with the highest rainfall) is May (1.42").
The driest month (with the least rainfall) is July (0.39").
Average rainfall days in September
Atomic City, ID
- Average rainfall days in September: 8 days
The month with the highest number of rainy days is May (15 days).
The month with the least rainy days is July (5.9 days).
Average snowfall in September
Atomic City, ID
- Average snowfall in September: 0.16"
The month with the highest snowfall is February (7.2").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
Atomic City, ID
- Average snowfall days in September: 0.2 days
The month with the highest number of snowfall days is February (15.1 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Atomic City, 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 4min
The month with the most sunshine is July (Average sunshine: 12h and 0min).
The month with the least sunshine is January (Average sunshine: 5h and 30min).
Average sunshine days in September
Atomic City, ID
- Average sunshine days in September: 19.4 days
The month with the most sunshine days is July (20.9 days).
The month with the least sunshine days is May (11.3 days).
Average UV index in September
Atomic City, 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
Atomic City, ID
- Average cloud cover in September: 15
The month with the most cloud cover is February (Cloud cover 45).
The month with the least cloud cover is July (Cloud cover 10).
Average visibility in September
Atomic City, ID
- Average visibility in September: 6mi
The months with the highest visibility are March, April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January and February (4mi).
Atomic City, Idaho, USA
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