September weather forecastBismarck, IL
September
Weather in September
The first month of the autumn, September, is still a warm month in Bismarck, Illinois, with temperature in the range of an average low of 57.7°F (14.3°C) and an average high of 76.1°F (24.5°C).Temperature
September is marked by an average high-temperature of a still moderately hot 76.1°F (24.5°C), almost identical to the preceding month. During September, the temperature is averaged to a low of 57.7°F (14.3°C) at night.Humidity
In Bismarck, the average relative humidity in September is 77%.Rainfall
February and September are months with the least rain when the rain falls for 12.5 days and typically aggregates up to 1.38" (35mm) of rain.Snowfall
May through October are months without snowfall.Daylight
In Bismarck, the average length of the day in September is 12h and 26min.On the first day of the month, sunrise is at 6:18 am and sunset at 7:21 pm. On the last day of September, sunrise is at 6:46 am and sunset at 6:33 pm CDT.
Sunshine
In September, the average sunshine is 8.8h.UV index
In September, the average daily maximum UV index is 5. A UV Index estimate of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV rays for the average person.Note: The UV index of 5 during September translates into the following guidance:
Prioritize safety - Suggestions to prevent sun damage are offered. The midday Sun can be harmful due to its potent UV radiation; seek shade and reduce exposure. Enhance your sun protection with tightly woven, yet airy clothing.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Bismarck, IL
- Average high temperature in September: 76.1°F
The warmest month (with the highest average high temperature) is July (81.3°F).
The month with the lowest average high temperature is January (31.6°F).
- Average low temperature in September: 57.7°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 (20.5°F).
Average pressure in September
Bismarck, IL
- Average pressure in September: 30.03"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in September
Bismarck, IL
- Average wind speed in September: 7.1mph
The windiest month (with the highest average wind speed) is January (10.4mph).
The calmest months (with the lowest average wind speed) are July and August (6.2mph).
Average humidity in September
Bismarck, IL
- Average humidity in September: 77%
The month with the highest relative humidity is July (84%).
The month with the lowest relative humidity is October (72%).
Average rainfall in September
Bismarck, IL
- Average rainfall in September: 1.38"
The wettest month (with the highest rainfall) is April (3.23").
The driest months (with the least rainfall) are February and September (1.38").
Average rainfall days in September
Bismarck, IL
- Average rainfall days in September: 12.5 days
The month with the highest number of rainy days is May (18 days).
The month with the least rainy days is February (6.6 days).
Average snowfall in September
Bismarck, IL
- Average snowfall in September: 0"
The month with the highest snowfall is February (2.64").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Bismarck, IL
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (10.6 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
Bismarck, IL
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in September: 8h and 48min
The month with the most sunshine is June (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 4h and 0min).
Average sunshine days in September
Bismarck, IL
- Average sunshine days in September: 15.2 days
The month with the most sunshine days is November (18 days).
The month with the least sunshine days is July (9.5 days).
Average UV index in September
Bismarck, IL
- Average UV index in September: 5
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in September
Bismarck, IL
- Average cloud cover in September: 32
The month with the most cloud cover is January (Cloud cover 58).
The months with the least cloud cover are June, August and September (Cloud cover 32).
Average visibility in September
Bismarck, IL
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are July and August (5mi).
