September weather forecastParnell, IL
September
Weather in September
The first month of the autumn, September, is also a moderately hot month in Parnell, Illinois, with an average temperature fluctuating between 58.1°F (14.5°C) and 75.9°F (24.4°C).Temperature
The start of September sees the average high-temperature at a still warm 75.9°F (24.4°C), showing little difference from August's 80.2°F (26.8°C). September nights observe an average temperature dip to a mild 58.1°F (14.5°C).Humidity
In Parnell, the average relative humidity in September is 76%.Rainfall
In Parnell, during September, the rain falls for 10.7 days and regularly aggregates up to 1.34" (34mm) of precipitation. Throughout the year, there are 138.7 rainfall days, and 20.91" (531mm) of precipitation is accumulated.Snowfall
May through October are months without snowfall in Parnell.Daylight
In Parnell, the average length of the day in September is 12h and 26min.On the first day of the month, sunrise is at 6:23 am and sunset at 7:26 pm. On the last day of September, sunrise is at 6:50 am and sunset at 6:38 pm CDT.
Sunshine
The average sunshine in September in Parnell is 9.1h.UV index
In September, the average daily maximum UV index in Parnell, Illinois, is 5. A UV Index of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV radiation for ordinary individuals.Note: The average daily UV index of 5 in September transforms into the following instructions:
Preventative actions are necessary - Suggestions to safeguard against sun damage are in order. Sun's radiation is most powerful around mid-day, so it's best to limit outdoor activities during this time. Arm yourself against UV rays' harm with protective apparel and UV-filtering shades.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Parnell, IL
- Average high temperature in September: 75.9°F
The warmest month (with the highest average high temperature) is July (81°F).
The month with the lowest average high temperature is January (31.5°F).
- Average low temperature in September: 58.1°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 (19.9°F).
Average pressure in September
Parnell, 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 (29.92"Hg).
Average wind speed in September
Parnell, IL
- Average wind speed in September: 7.5mph
The windiest month (with the highest average wind speed) is January (10.9mph).
The calmest month (with the lowest average wind speed) is August (6.4mph).
Average humidity in September
Parnell, IL
- Average humidity in September: 76%
The month with the highest relative humidity is July (85%).
The month with the lowest relative humidity is October (70%).
Average rainfall in September
Parnell, IL
- Average rainfall in September: 1.34"
The wettest month (with the highest rainfall) is May (2.83").
The driest month (with the least rainfall) is December (1.1").
Average rainfall days in September
Parnell, IL
- Average rainfall days in September: 10.7 days
The month with the highest number of rainy days is May (17.3 days).
The month with the least rainy days is February (6.1 days).
Average snowfall in September
Parnell, IL
- Average snowfall in September: 0"
The month with the highest snowfall is January (2.76").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in September
Parnell, IL
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (9.6 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
Parnell, 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: 9h and 6min
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
Parnell, IL
- Average sunshine days in September: 16.6 days
The month with the most sunshine days is November (19.2 days).
The month with the least sunshine days is May (10.4 days).
Average UV index in September
Parnell, IL
- Average UV index in September: 5
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in September
Parnell, 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 September (Cloud cover 30).
Average visibility in September
Parnell, 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).
