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The hottest temperature recorded for September
was 99 degrees in Springfield on Sept. 5, and the coldest was 30
degrees at Ottawa on Sept. 29.
The statewide average rainfall for September was 4.97 inches,
1.74 inches above normal, so that 2018 was the 19th wettest
September on record. The highest monthly rainfall total for the
month was 12.43 inches at Clay City, just south of Effingham.
Rainfall was heaviest in southern Illinois with amounts up to 12
inches and in northwestern and western Illinois with amounts up
to 10 inches–all well above normal. A band of drier conditions
stretched from St. Louis to Chicago where rainfall totals of 1
to 3 inches were common.
Heavy rains also fell across the upper Midwest in September. The
rains were especially heavy in Wisconsin, Iowa, and Minnesota,
leading to river flooding in Illinois along the Mississippi and
rivers flowing out of Wisconsin.
The National Weather Service outlook for October shows Illinois
with very strong chances for above-normal temperatures and
rainfall.
[Lisa Sheppard]
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