Monthly Historical AveragesPetersburg, IL
Average Temperature
High
24°
Feels 25
Low
13°
Feels 12
Average Precipitation
12 Days
114.5mm
0cm
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Daily Historical Averages
S
M
T
W
T
F
S
ForecastWednesday, May 20, 2026
Day
20°Feels 20
Wind
18 km/h N
Gust
27 km/h
Humidity
51%
P.O.P
30%
Night
8°Feels 6
Wind
19 km/h NE
Gust
28 km/h
Humidity
75%
P.O.P
10%
Historical AveragesMay 20
High
Feels
Low
Feels
Precip Frequency
Total Daylight
Humidity