September weather forecastBarstow, IL
September
Weather in September
The first month of the autumn, September, is also a moderately hot month in Barstow, Illinois, with temperature in the range of an average low of 56.3°F (13.5°C) and an average high of 75.4°F (24.1°C).Temperature
September brings a marginal elevation to a still warm 75.4°F (24.1°C) from August's 80.6°F (27°C) in Barstow's average high-temperatures. September brings Barstow a consistent average low-temperature of 56.3°F (13.5°C).Humidity
In Barstow, the average relative humidity in September is 76%.Rainfall
In Barstow, in September, it is raining for 6.9 days, with typically 0.75" (19mm) of accumulated precipitation. In Barstow, during the entire year, the rain falls for 99.4 days and collects up to 9.57" (243mm) of precipitation.Snowfall
Months with snowfall in Barstow, Illinois, are January through April, September through December. September is the first month it typically snows. Throughout September, in the average 0.1 snowfall days, it receives 0.04" (1mm) of snow. In Barstow, Illinois, during the entire year, snow falls for 24.5 days and aggregates up to 4.09" (104mm) of snow.Daylight
In Barstow, the average length of the day in September is 12h and 28min.On the first day of September in Barstow, sunrise is at 6:28 am and sunset at 7:34 pm. On the last day of the month, sunrise is at 6:57 am and sunset at 6:44 pm CDT.
Sunshine
In September, the average sunshine in Barstow is 9.1h.UV index
In Barstow, Illinois, the average daily maximum UV index in September is 4. A UV Index estimate of 3 to 5 represents a medium vulnerability from unprotected exposure to Sun's UV rays for the ordinary person.Note: In September, a regular UV index of 4 translates into these guidelines:
Exercise caution. Those with pale skin may experience burns in less than half an hour. It's recommended to limit sun exposure when its radiation is at its peak during midday. Sunglasses that ward off UVA and UVB rays play a pivotal role in reducing solar eye damage. Forewarned is forearmed! The Sun's UV radiation can be almost doubled in intensity by snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Barstow, IL
- Average high temperature in September: 75.4°F
The warmest month (with the highest average high temperature) is July (81.7°F).
The month with the lowest average high temperature is January (28.2°F).
- Average low temperature in September: 56.3°F
The month with the highest average low temperature is July (64.8°F).
The coldest month (with the lowest average low temperature) is January (15.4°F).
Average pressure in September
Barstow, 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 (29.91"Hg).
Average wind speed in September
Barstow, 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
Barstow, 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
Barstow, IL
- Average rainfall in September: 0.75"
The wettest month (with the highest rainfall) is May (1.61").
The driest month (with the least rainfall) is December (0.35").
Average rainfall days in September
Barstow, IL
- Average rainfall days in September: 6.9 days
The month with the highest number of rainy days is May (13.4 days).
The month with the least rainy days is January (3.2 days).
Average snowfall in September
Barstow, IL
- Average snowfall in September: 0.04"
The month with the highest snowfall is January (1.26").
The months with the least snowfall are May, June, July and August (0").
Average snowfall days in September
Barstow, IL
- Average snowfall days in September: 0.1 days
The month with the highest number of snowfall days is January (7.2 days).
The months with the least snowfall days are May, June, July and August (0 days).
Average daylight in September /
Average sunshine in September
Barstow, 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 6min
The month with the most sunshine is July (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 3h and 54min).
Average sunshine days in September
Barstow, IL
- Average sunshine days in September: 20.9 days
The month with the most sunshine days is December (22.4 days).
The month with the least sunshine days is June (14.4 days).
Average UV index in September
Barstow, IL
- Average UV index in September: 4
The month with the highest UV index is July (UV index 6).
The month with the lowest UV index is January (UV index 1).
Average cloud cover in September
Barstow, IL
- Average cloud cover in September: 31
The month with the most cloud cover is January (Cloud cover 58).
The month with the least cloud cover is August (Cloud cover 30).
Average visibility in September
Barstow, 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).
