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7 Days
14 Days
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Monthly
Precipitation
Temperature
Wind
Temperature Unit Selection
°Celsius
°Fahrenheit
Monthly Historical Averages
O'Fallon, MO
Content continues below
June
Average Temperature
High
29°
Feels 32
Low
19°
Feels 19
Average Precipitation
12 Days
Rain amount
131.1mm
Snow amount
0cm
Content continues below
Daily Historical Averages
June 2026
S
M
T
W
T
F
S
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
24°
16
25°
17
32°
18
24°
19
26°
20
29°
21
29°
22
25°
23
25°
24
28°
25
30°
26
33°
27
34°
28
34°
29
36°
30
Forecast
Monday, June 15, 2026
Day
24°
Feels 24
Wind
9 km/h NW
Gust
14 km/h
Humidity
43%
P.O.P
20%
Night
15°
Feels 15
Wind
13 km/h SW
Gust
19 km/h
Humidity
77%
P.O.P
20%
Historical Averages
Jun 15
High
Feels
Low
Feels
Precip Frequency
Total Daylight
Humidity
Historical Averages are based on data recorded from 2000 onwards.