September weather forecastOrion, IL
September
Weather in September
The first month of the autumn, September, is also a moderately hot month in Orion, Illinois, with an average temperature fluctuating between 75.4°F (24.1°C) and 56.5°F (13.6°C).Temperature
The onset of September brings with it an average high-temperature of a still warm 75.4°F (24.1°C), showing a negligible variation from the month before. During September, Orion witnesses a consistent average low-temperature of 56.5°F (13.6°C).Humidity
In September, the average relative humidity is 76%.Rainfall
In Orion, during September, the rain falls for 11.1 days and regularly aggregates up to 2.13" (54mm) of precipitation. Throughout the year, there are 143.6 rainfall days, and 27.99" (711mm) of precipitation is accumulated.Snowfall
May through September are months without snowfall.Daylight
In September, the average length of the day is 12h and 28min.On the first day of September, sunrise is at 6:28 am and sunset at 7:33 pm. On the last day of the month, sunrise is at 6:58 am and sunset at 6:44 pm CDT.
Sunshine
In September, the average sunshine is 9.3h.UV index
In Orion, the average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV radiation for the average person.Note: In September, a daily maximum UV index of 4 leads to the following instructions:
Undertake precautions - Obligation exists to protect against skin and eye damage. Avoiding direct sunlight during midday hours helps reduce the risk from intense UV radiation. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration. Remember to consider! The UV radiation from the Sun can be intensified nearly twice by the reflection of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Orion, IL
- Average high temperature in September: 75.4°F
The warmest month (with the highest average high temperature) is July (81.5°F).
The month with the lowest average high temperature is January (28.4°F).
- Average low temperature in September: 56.5°F
The month with the highest average low temperature is July (64.9°F).
The coldest month (with the lowest average low temperature) is January (16.2°F).
Average pressure in September
Orion, IL
- Average pressure in September: 30.02"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed in September
Orion, IL
- Average wind speed in September: 7.8mph
The windiest month (with the highest average wind speed) is April (10.6mph).
The calmest month (with the lowest average wind speed) is August (6.7mph).
Average humidity in September
Orion, IL
- Average humidity in September: 76%
The months with the highest relative humidity are January and July (83%).
The month with the lowest relative humidity is October (71%).
Average rainfall in September
Orion, IL
- Average rainfall in September: 2.13"
The wettest month (with the highest rainfall) is May (4.45").
The driest month (with the least rainfall) is December (1.26").
Average rainfall days in September
Orion, IL
- Average rainfall days in September: 11.1 days
The month with the highest number of rainy days is May (18.2 days).
The month with the least rainy days is January (5 days).
Average snowfall in September
Orion, IL
- Average snowfall in September: 0"
The month with the highest snowfall is January (4.09").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in September
Orion, IL
- Average snowfall days in September: 0.1 days
The month with the highest number of snowfall days is January (11.2 days).
The months with the least snowfall days are May, June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Orion, IL
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in September: 9h and 18min
The month with the most sunshine is July (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 4h and 0min).
Average sunshine days in September
Orion, IL
- Average sunshine days in September: 17.8 days
The month with the most sunshine days is November (17.9 days).
The month with the least sunshine days is May (10.4 days).
Average UV index in September
Orion, IL
- 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 January and December (UV index 1).
Average cloud cover in September
Orion, IL
- Average cloud cover in September: 30
The month with the most cloud cover is January (Cloud cover 57).
The month with the least cloud cover is August (Cloud cover 29).
Average visibility in September
Orion, IL
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
