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 the onset of September, Coolin's average high-temperature adjusts, receding from August's moderately hot 77.5°F (25.3°C) to a refreshing 66.7°F (19.3°C). Nighttime in September brings a stark departure from the daily high, resting at an average low-temperature of 40.8°F (4.9°C).Humidity
The average relative humidity in September is 64%.Rainfall
In Coolin, in September, it is raining for 10.1 days, with typically 1.1" (28mm) of accumulated precipitation. Throughout the year, in Coolin, there are 135.4 rainfall days, and 23.03" (585mm) of precipitation is accumulated.Snowfall
Months with snowfall in Coolin are January through May, September through December. September is the first month it typically snows in Coolin. Throughout September, in the average 0.3 snowfall days, it receives 0.63" (16mm) of snow. In Coolin, during the entire year, snow falls for 81.3 days and aggregates up to 59.45" (1510mm) of snow.Daylight
In Coolin, the average length of the day in September is 12h and 34min.On the first day of the month, sunrise is at 6:05 am and sunset at 7:28 pm. On the last day of September, in Coolin, Idaho, sunrise is at 6:46 am and sunset at 6:27 pm PDT.
Sunshine
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 moderate health risk from exposure to the Sun's UV radiation for ordinary individuals.Note: A typical high UV index of 3 in September suggests the following recommendations:
Take precautions - Protection against sunburn is recommended. For skin protection, it's recommended to minimize Sun exposure during its peak hours around midday. Combat UV radiation's detrimental effects with sun-safe clothing and UV-blocking eyewear. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
Frequently asked questions
What are September temperatures in Coolin?
What is the average humidity in September in Coolin?
How many days does it rain in September in Coolin?
When does it start to snow in Coolin?
What is the average length of the day in September in Coolin?
When are sunrise and sunset in September in Coolin?
How many hours of sunshine does Coolin have in September?
How high is the UV index in September in Coolin?
Average temperature in September
Coolin, ID
- Average high temperature in September: 66.7°F
The warmest month (with the highest average high temperature) is August (77.5°F).
The month with the lowest average high temperature is December (27.7°F).
- Average low temperature in September: 40.8°F
The month with the highest average low temperature is August (47.1°F).
The coldest months (with the lowest average low temperature) are February and December (16.7°F).
Average pressure in September
Coolin, ID
- Average pressure in September: 29.97"Hg
The month with the highest atmospheric pressure is January (30.19"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in September
Coolin, ID
- Average wind speed in September: 3.7mph
The windiest months (with the highest average wind speed) are April and May (4.2mph).
The calmest month (with the lowest average wind speed) is December (3.4mph).
Average humidity in September
Coolin, ID
- Average humidity in September: 64%
The month with the highest relative humidity is January (95%).
The month with the lowest relative humidity is August (54%).
Average rainfall in September
Coolin, ID
- Average rainfall in September: 1.1"
The wettest month (with the highest rainfall) is December (2.83").
The driest month (with the least rainfall) is August (0.59").
Average rainfall days in September
Coolin, ID
- Average rainfall days in September: 10.1 days
The month with the highest number of rainy days is April (17.7 days).
The month with the least rainy days is February (5.3 days).
Average snowfall in September
Coolin, ID
- Average snowfall in September: 0.63"
The month with the highest snowfall is January (14.76").
The months with the least snowfall are June, July and August (0").
Average snowfall days in September
Coolin, ID
- Average snowfall days in September: 0.3 days
The month with the highest number of snowfall days is December (17.6 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Coolin, ID
- Average daylight in September: 12h and 4min
The month with the longest days is June (Average daylight: 16h and 6min).
The month with the shortest days is December (Average daylight: 8h and 24min).
- Average sunshine in September: 9h and 3min
The month with the most sunshine is August (Average sunshine: 11h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 6min).
Average sunshine days in September
Coolin, ID
- Average sunshine days in September: 18.3 days
The month with the most sunshine days is August (21 days).
The month with the least sunshine days is April (9 days).
Average UV index in September
Coolin, ID
- Average UV index in September: 3
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 1).
Average cloud cover in September
Coolin, ID
- Average cloud cover in September: 26
The month with the most cloud cover is January (Cloud cover 69).
The month with the least cloud cover is August (Cloud cover 16).
Average visibility in September
Coolin, ID
- Average visibility in September: 6mi
The months with the highest visibility are May, June, July, August and September (6mi).
The month with the lowest visibility is January (2mi).
Coolin, Idaho, USA
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