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
Ashton experiences a transition to a still warm 73.4°F (23°C) in average high-temperatures with the arrival of September, not greatly differing from August's 78.3°F (25.7°C). An average low-temperature of 54.5°F (12.5°C) marks the month of September.Humidity
In September, the average relative humidity is 79%.Rainfall
In September, the rain falls for 10.1 days. Throughout September, 1.14" (29mm) of precipitation is accumulated. In Ashton, during the entire year, the rain falls for 124.5 days and collects up to 14.49" (368mm) of precipitation.Snowfall
In Ashton, snow does not fall in May through September.Daylight
In September, the average length of the day is 12h and 28min.On the first day of September, sunrise is at 6:23 am and sunset at 7:29 pm. On the last day of the month, sunrise is at 6:53 am and sunset at 6:39 pm CDT.
Sunshine
In Ashton, the average sunshine in September is 8.6h.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 exposure to the Sun's UV rays for average individuals.Note: The daily high UV index of 4 in September translates into this advice:
Be cautious. Those with fair skin can be subjected to burns in fewer than 30 minutes. The Sun is at its harshest during midday; protect yourself by staying in shaded areas and minimizing exposure. Shield yourself from the harmful effects of UV radiation with sun-protective attire, a hat, and quality sunglasses.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in September?
What is the average humidity in September?
How much does it rain in September?
When it does not snow?
Does it snow in September?
What is the average length of the day in September?
What time are sunrise and sunset in September?
How long on average sun shines in September?
How high is the UV index in September?
Average temperature in September
Ashton, IL
- Average high temperature in September: 73.4°F
The warmest month (with the highest average high temperature) is July (79.9°F).
The month with the lowest average high temperature is January (27°F).
- Average low temperature in September: 54.5°F
The month with the highest average low temperature is July (63.1°F).
The coldest month (with the lowest average low temperature) is January (14.7°F).
Average pressure in September
Ashton, IL
- Average pressure in September: 30.03"Hg
The month with the highest atmospheric pressure is January (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in September
Ashton, IL
- Average wind speed in September: 7.4mph
The windiest month (with the highest average wind speed) is April (10.3mph).
The calmest month (with the lowest average wind speed) is August (6.3mph).
Average humidity in September
Ashton, IL
- Average humidity in September: 79%
The months with the highest relative humidity are January and July (85%).
The month with the lowest relative humidity is October (74%).
Average rainfall in September
Ashton, IL
- Average rainfall in September: 1.14"
The wettest month (with the highest rainfall) is June (2.13").
The driest month (with the least rainfall) is February (0.55").
Average rainfall days in September
Ashton, IL
- Average rainfall days in September: 10.1 days
The month with the highest number of rainy days is June (16 days).
The month with the least rainy days is February (3.8 days).
Average snowfall in September
Ashton, IL
- Average snowfall in September: 0"
The month with the highest snowfall is January (2.2").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Ashton, IL
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (10.3 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in September /
Average sunshine in September
Ashton, IL
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in September: 8h and 4min
The month with the most sunshine is June (Average sunshine: 9h and 30min).
The month with the least sunshine is January (Average sunshine: 3h and 36min).
Average sunshine days in September
Ashton, IL
- Average sunshine days in September: 18.5 days
The month with the most sunshine days is November (19.3 days).
The month with the least sunshine days is June (10.9 days).
Average UV index in September
Ashton, IL
- Average UV index in September: 4
The months with the highest UV index are May, June, July and August (UV index 5).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in September
Ashton, IL
- Average cloud cover in September: 34
The month with the most cloud cover is January (Cloud cover 63).
The month with the least cloud cover is September (Cloud cover 34).
Average visibility in September
Ashton, IL
- Average visibility in September: 6mi
The months with the highest visibility are February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are January, July and August (5mi).
Ashton, Illinois, USA
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