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
Onset of September witnesses a reduction in the average high-temperature, falling from a moderately hot 82°F (27.8°C) in August to a pleasant 72.7°F (22.6°C). Despite considerable daily temperature swings, a steady low-temperature average of 48.9°F (9.4°C) is noted throughout September.Humidity
In September, the average relative humidity is 51%.Rainfall
In Cottonwood, during September, the rain falls for 9.8 days and regularly aggregates up to 1.1" (28mm) of precipitation. In Cottonwood, during the entire year, the rain falls for 133.5 days and collects up to 28.9" (734mm) of precipitation.Snowfall
January through June, September through December are months with snowfall. September is the first month it typically snows. Throughout September, in the average 0.3 snowfall days, it receives 0.47" (12mm) of snow. Throughout the year, there are 112.2 snowfall days, and 105.79" (2687mm) of snow is accumulated.Daylight
In September, the average length of the day is 12h and 31min.On the first day of the month, sunrise is at 6:07 am and sunset at 7:23 pm. On the last day of September, sunrise is at 6:43 am and sunset at 6:26 pm PDT.
Sunshine
The average sunshine in September in Cottonwood is 9.9h.UV index
In September, the average daily maximum UV index is 4. A UV Index reading of 3 to 5 represents a moderate threat to health from unprotected exposure to Sun's UV rays for the average person.Note: The maximum daily UV index of 4 during September translates into the following directions:
Adopt protective measures - Suggestions to resist sunburn are offered. Protect yourself from the midday Sun's peak UV radiation by minimizing exposure. For excellent sun protection for the eyes, ears, face, and neck, consider a wide-brim hat. Watch out! The Sun's UV radiation can be nearly magnified twofold due to snow reflection.
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 Cottonwood have in September?
When are sunrise and sunset in September?
How many hours of sunshine does Cottonwood have in September?
What is the UV index reading in September in Cottonwood?
Average temperature in September
Cottonwood, ID
- Average high temperature in September: 72.7°F
The warmest month (with the highest average high temperature) is August (82°F).
The month with the lowest average high temperature is December (32.5°F).
- Average low temperature in September: 48.9°F
The month with the highest average low temperature is August (54.7°F).
The coldest month (with the lowest average low temperature) is December (20.7°F).
Average pressure in September
Cottonwood, ID
- Average pressure in September: 29.97"Hg
The month with the highest atmospheric pressure is January (30.21"Hg).
The months with the lowest atmospheric pressure are June and August (29.93"Hg).
Average wind speed in September
Cottonwood, ID
- Average wind speed in September: 3.7mph
The windiest months (with the highest average wind speed) are January, February, March and November (4.8mph).
The calmest month (with the lowest average wind speed) is August (3.6mph).
Average humidity in September
Cottonwood, ID
- Average humidity in September: 51%
The month with the highest relative humidity is January (90%).
The month with the lowest relative humidity is August (44%).
Average rainfall in September
Cottonwood, ID
- Average rainfall in September: 1.1"
The wettest month (with the highest rainfall) is April (3.58").
The driest month (with the least rainfall) is July (0.63").
Average rainfall days in September
Cottonwood, ID
- Average rainfall days in September: 9.8 days
The month with the highest number of rainy days is April (17.8 days).
The month with the least rainy days is January (6 days).
Average snowfall in September
Cottonwood, ID
- Average snowfall in September: 0.47"
The month with the highest snowfall is February (23.11").
The months with the least snowfall are July and August (0").
Average snowfall days in September
Cottonwood, ID
- Average snowfall days in September: 0.3 days
The month with the highest number of snowfall days is December (19.9 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in September /
Average sunshine in September
Cottonwood, ID
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).
- Average sunshine in September: 9h and 5min
The month with the most sunshine is August (Average sunshine: 11h and 54min).
The month with the least sunshine is December (Average sunshine: 4h and 12min).
Average sunshine days in September
Cottonwood, ID
- Average sunshine days in September: 18.1 days
The month with the most sunshine days is July (21.2 days).
The month with the least sunshine days is March (7.3 days).
Average UV index in September
Cottonwood, ID
- Average UV index in September: 4
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are February and December (UV index 1).
Average cloud cover in September
Cottonwood, ID
- Average cloud cover in September: 22
The month with the most cloud cover is February (Cloud cover 59).
The month with the least cloud cover is August (Cloud cover 13).
Average visibility in September
Cottonwood, ID
- Average visibility in September: 6mi
The months with the highest visibility are May, June, July, August, September and October (6mi).
The months with the lowest visibility are January, February and December (4mi).
Cottonwood, Idaho, USA
Weather forecast for your location
2. Allow the app to use your location