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
As August transitions to September, the average high-temperature falls from a moderately hot 75.4°F (24.1°C) to an enjoyable 65.7°F (18.7°C). Despite the hot September days, Clayton's nights see an average temperature plunge to an icy 41.5°F (5.3°C).Humidity
In September, the average relative humidity in Clayton is 45%.Rainfall
In Clayton, Idaho, in September, it is raining for 6.9 days, with typically 0.51" (13mm) of accumulated precipitation. In Clayton, Idaho, during the entire year, the rain falls for 75.7 days and collects up to 6.38" (162mm) of precipitation.Snowfall
January through June, September through December are months with snowfall in Clayton. September is the first month it typically snows. Throughout September, in the average 0.5 snowfall days, it receives 0.67" (17mm) of snow. In Clayton, during the entire year, snow falls for 51.7 days and aggregates up to 18.62" (473mm) of snow.Daylight
In September, the average length of the day in Clayton is 12h and 30min.On the first day of the month, sunrise is at 7:01 am and sunset at 8:13 pm. On the last day of September, sunrise is at 7:35 am and sunset at 7:19 pm MDT.
Sunshine
In Clayton, Idaho, the average sunshine in September is 9.5h.UV index
In September, the average daily maximum UV index is 3. A UV Index reading of 3 to 5 represents a medium health hazard from unsafe exposure to UV radiation for average individuals.Note: The daily maximum UV index of 3 in September interprets into the following advice:
Exercise care. People with light skin might get burns in fewer than 30 minutes. Sun exposure should be minimized, especially during midday, to avoid harmful UV radiation. Shield yourself from the harmful effects of UV radiation with sun-protective attire, a hat, and quality sunglasses. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
Frequently asked questions
What are September temperatures in Clayton?
What is the average humidity in September in Clayton?
How much does it rain in Clayton in September?
When does it start snowing in Clayton?
How many hours of daylight does Clayton have in September?
When is the sunrise / sunset in September in Clayton?
How long on average sun shines in September in Clayton?
How high is the UV index in September in Clayton?
Average temperature in September
Clayton, ID
- Average high temperature in September: 65.7°F
The warmest month (with the highest average high temperature) is July (76.6°F).
The month with the lowest average high temperature is December (26.1°F).
- Average low temperature in September: 41.5°F
The month with the highest average low temperature is August (47.8°F).
The coldest month (with the lowest average low temperature) is January (8.1°F).
Average pressure in September
Clayton, ID
- Average pressure in September: 29.98"Hg
The month with the highest atmospheric pressure is January (30.27"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in September
Clayton, ID
- Average wind speed in September: 5.2mph
The windiest months (with the highest average wind speed) are June and July (5.7mph).
The calmest month (with the lowest average wind speed) is January (4.8mph).
Average humidity in September
Clayton, ID
- Average humidity in September: 45%
The month with the highest relative humidity is February (87%).
The months with the lowest relative humidity are July and August (38%).
Average rainfall in September
Clayton, ID
- Average rainfall in September: 0.51"
The wettest month (with the highest rainfall) is June (1.1").
The driest month (with the least rainfall) is July (0.28").
Average rainfall days in September
Clayton, ID
- Average rainfall days in September: 6.9 days
The month with the highest number of rainy days is June (10.2 days).
The month with the least rainy days is January (3.8 days).
Average snowfall in September
Clayton, ID
- Average snowfall in September: 0.67"
The month with the highest snowfall is February (3.54").
The months with the least snowfall are July and August (0").
Average snowfall days in September
Clayton, ID
- Average snowfall days in September: 0.5 days
The month with the highest number of snowfall days is December (10.1 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in September /
Average sunshine in September
Clayton, ID
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 30min).
The month with the shortest days is December (Average daylight: 8h and 54min).
- Average sunshine in September: 9h and 3min
The month with the most sunshine is July (Average sunshine: 11h and 54min).
The month with the least sunshine is January (Average sunshine: 5h and 48min).
Average sunshine days in September
Clayton, ID
- Average sunshine days in September: 21.6 days
The month with the most sunshine days is July (24.1 days).
The months with the least sunshine days are March and April (17.2 days).
Average UV index in September
Clayton, ID
- Average UV index in September: 3
The months with the highest UV index are June and July (UV index 5).
The months with the lowest UV index are January, February, March, April, October, November and December (UV index 2).
Average cloud cover in September
Clayton, ID
- Average cloud cover in September: 16
The month with the most cloud cover is February (Cloud cover 44).
The month with the least cloud cover is July (Cloud cover 11).
Average visibility in September
Clayton, 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).
Clayton, Idaho, USA
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