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
In Ashton, entering September brings a temperature decrement, reducing from August's moderately hot 79.5°F (26.4°C) to an agreeable 69.4°F (20.8°C). A significant temperature decrease to an average a chilly 44.1°F (6.7°C) characterizes Ashton's nighttime temperatures during September.Humidity
In September, the average relative humidity is 48%.Rainfall
In Ashton, in September, during 9.1 rainfall days, 1.26" (32mm) of precipitation is typically accumulated. Throughout the year, there are 121 rainfall days, and 20.12" (511mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through June, September through December. 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 Ashton, during the entire year, snow falls for 119.7 days and aggregates up to 88.23" (2241mm) of snow.Daylight
The average length of the day in September is 12h and 29min.On the first day of the month, sunrise is at 6:49 am and sunset at 8:01 pm. On the last day of September, sunrise is at 7:23 am and sunset at 7:07 pm MDT.
Sunshine
The average sunshine in September is 10h.UV index
The average daily maximum UV index in September is 3. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV radiation for average individuals.Note: An average maximum UV index of 3 in September leads to these recommendations:
Exercise prudence. Persons with fair skin could be burned in under 30 minutes. For health reasons, it's advisable to reduce direct sun exposure during peak hours around midday. Shield yourself from the harmful effects of UV radiation with sun-protective attire, a hat, and quality sunglasses. Remember! The Sun's UV radiation can be magnified almost twofold by the reflection of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the average September temperature?
What is the average humidity in September?
How many days does it rain in September?
When does it start to snow?
What is the average length of the day in September?
When are sunrise and sunset in September?
How many hours of sunshine does Ashton have in September?
What is the UV index reading in September?
Average temperature in September
Ashton, ID
- Average high temperature in September: 69.4°F
The warmest month (with the highest average high temperature) is July (80.2°F).
The month with the lowest average high temperature is December (25°F).
- Average low temperature in September: 44.1°F
The month with the highest average low temperature is July (50°F).
The coldest month (with the lowest average low temperature) is January (10.8°F).
Average pressure in September
Ashton, ID
- Average pressure in September: 29.99"Hg
The month with the highest atmospheric pressure is January (30.27"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in September
Ashton, ID
- Average wind speed in September: 6mph
The windiest month (with the highest average wind speed) is June (6.6mph).
The calmest month (with the lowest average wind speed) is January (4.4mph).
Average humidity in September
Ashton, ID
- Average humidity in September: 48%
The months with the highest relative humidity are January and February (92%).
The month with the lowest relative humidity is August (42%).
Average rainfall in September
Ashton, ID
- Average rainfall in September: 1.26"
The wettest month (with the highest rainfall) is January (2.44").
The driest month (with the least rainfall) is July (0.59").
Average rainfall days in September
Ashton, ID
- Average rainfall days in September: 9.1 days
The month with the highest number of rainy days is May (17.3 days).
The month with the least rainy days is January (4.5 days).
Average snowfall in September
Ashton, ID
- Average snowfall in September: 0.67"
The month with the highest snowfall is January (20").
The months with the least snowfall are July and August (0").
Average snowfall days in September
Ashton, ID
- Average snowfall days in September: 0.5 days
The month with the highest number of snowfall days is December (21.6 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in September /
Average sunshine in September
Ashton, 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: 8h and 54min).
- Average sunshine in September: 10h and 0min
The month with the most sunshine is July (Average sunshine: 11h and 54min).
The month with the least sunshine is January (Average sunshine: 4h and 12min).
Average sunshine days in September
Ashton, ID
- Average sunshine days in September: 18 days
The month with the most sunshine days is July (19.9 days).
The month with the least sunshine days is April (6.7 days).
Average UV index in September
Ashton, 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
Ashton, ID
- Average cloud cover in September: 17
The month with the most cloud cover is February (Cloud cover 61).
The months with the least cloud cover are July and August (Cloud cover 12).
Average visibility in September
Ashton, ID
- Average visibility in September: 6mi
The months with the highest visibility are April, May, June, July, August, September and October (6mi).
The month with the lowest visibility is January (3mi).
Ashton, Idaho, USA
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