September weather forecastBonnie, IL
September
Weather in September
September, the first month of the autumn in Bonnie, is still a warm month, with temperature in the range of an average low of 60.1°F (15.6°C) and an average high of 79°F (26.1°C).Temperature
Bonnie signifies an average high-temperature of a still moderately hot 79°F (26.1°C) in September, closely mirroring the 84°F (28.9°C) of August. In Bonnie, an average low-temperature of 60.1°F (15.6°C) is recorded during September nights.Humidity
In Bonnie, the average relative humidity in September is 74%.Rainfall
The month with the least rainfall is September, when the rain falls for 11.6 days and typically collects 1.61" (41mm) of precipitation.Snowfall
May through October are months without snowfall.Daylight
The average length of the day in September is 12h and 25min.On the first day of the month, sunrise is at 6:25 am and sunset at 7:24 pm. On the last day of September, sunrise is at 6:51 am and sunset at 6:39 pm CDT.
Sunshine
In Bonnie, the average sunshine in September is 9.3h.UV index
The average daily maximum UV index in September is 5. A UV Index reading of 3 to 5 represents a medium vulnerability from unprotected exposure to Sun's UV rays for the ordinary person.Note: In September, the average maximum UV index of 5 translates into the following recommendations:
Act with care - The need to guard against sun damage is communicated. It's crucial to reduce time in the direct Sun around mid-day due to the intense solar radiation. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Bonnie, IL
- Average high temperature in September: 79°F
The warmest month (with the highest average high temperature) is July (85.6°F).
The month with the lowest average high temperature is January (37.9°F).
- Average low temperature in September: 60.1°F
The month with the highest average low temperature is July (67.8°F).
The coldest month (with the lowest average low temperature) is January (24.8°F).
Average pressure in September
Bonnie, IL
- Average pressure in September: 30.03"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in September
Bonnie, IL
- Average wind speed in September: 6.5mph
The windiest month (with the highest average wind speed) is January (9.9mph).
The calmest months (with the lowest average wind speed) are July and August (5.9mph).
Average humidity in September
Bonnie, IL
- Average humidity in September: 74%
The month with the highest relative humidity is May (80%).
The month with the lowest relative humidity is October (71%).
Average rainfall in September
Bonnie, IL
- Average rainfall in September: 1.61"
The wettest month (with the highest rainfall) is April (3.78").
The driest month (with the least rainfall) is September (1.61").
Average rainfall days in September
Bonnie, IL
- Average rainfall days in September: 11.6 days
The month with the highest number of rainy days is May (17 days).
The month with the least rainy days is January (7.5 days).
Average snowfall in September
Bonnie, IL
- Average snowfall in September: 0"
The month with the highest snowfall is February (1.73").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Bonnie, IL
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (4.8 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in September /
Average sunshine in September
Bonnie, IL
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in September: 9h and 18min
The month with the most sunshine is June (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 4h and 30min).
Average sunshine days in September
Bonnie, IL
- Average sunshine days in September: 16.4 days
The month with the most sunshine days is October (20.3 days).
The month with the least sunshine days is May (11.3 days).
Average UV index in September
Bonnie, IL
- Average UV index in September: 5
The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, November and December (UV index 2).
Average cloud cover in September
Bonnie, IL
- Average cloud cover in September: 28
The month with the most cloud cover is January (Cloud cover 51).
The month with the least cloud cover is June (Cloud cover 27).
Average visibility in September
Bonnie, 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).
