10 day forecast
Monthly forecast
Weather map
City or area
Find
Sign up
Log in
Go to comparison
Monthly weather forecast in O'Fallon
30 days
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
30 days
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
Sun
Sunday
Mon
Monday
Tue
Tuesday
Wed
Wednesday
Thu
Thursday
Fri
Friday
Sat
Saturday
15
+3
+1
15 December, sun
+3
+1
Feels like
−3
753 mmHg
68%
6
m/s
W
15 December, Sunday. day, 3°; night, 1°; partly cloudy
16
+3
−1
16 December, mon
+3
−1
Feels like
−2
753 mmHg
69%
5
m/s
SW
16 December, Monday. day, 3°; night, -1°; clear
17
+4
+1
17 December, tue
+4
+1
Feels like
0
751 mmHg
75%
4.6
m/s
W
17 December, Tuesday. day, 4°; night, 1°; partly cloudy
18
December
+7
−3
18 December, wed
+7
−3
Feels like
−1
755 mmHg
71%
6
m/s
N
Climate normal
+4
+1
18 December, Wednesday. day, 7°; night, -3°; partly cloudy
19
+10
−2
19 December, thu
+10
−2
Feels like
0
750 mmHg
64%
6.2
m/s
SW
Climate normal
+6
+2
19 December, Thursday. day, 10°; night, -2°; partly cloudy
20
+1
−3
20 December, fri
+1
−3
Feels like
−10
755 mmHg
59%
9.2
m/s
NW
Climate normal
+7
+4
20 December, Friday. day, 1°; night, -3°; overcast
21
+2
−4
21 December, sat
+2
−4
Feels like
−6
757 mmHg
65%
2.8
m/s
E
Climate normal
+2
+2
21 December, Saturday. day, 2°; night, -4°; mostly clear
22
+6
+2
22 December, sun
+6
+2
Feels like
−4
755 mmHg
59%
4.5
m/s
SE
Climate normal
+4
0
22 December, Sunday. day, 6°; night, 2°; mostly clear
23
+7
+7
23 December, mon
+7
+7
Feels like
+1
751 mmHg
70%
4.4
m/s
S
Climate normal
+3
0
23 December, Monday. day, 7°; night, 7°; light rain
24
+9
+7
24 December, tue
+9
+7
Feels like
+5
751 mmHg
90%
3.3
m/s
S
Climate normal
+3
+2
24 December, Tuesday. day, 9°; night, 7°; overcast
25
+10
+8
25 December, wed
+10
+8
Feels like
+6
747 mmHg
92%
3.1
m/s
S
Climate normal
+3
−1
25 December, Wednesday. day, 10°; night, 8°; rain
26
+12
+10
26 December, thu
+12
+10
Feels like
+7
746 mmHg
88%
3.1
m/s
SE
Climate normal
+4
+1
26 December, Thursday. day, 12°; night, 10°; rain
27
+12
+8
27 December, fri
+12
+8
Feels like
+7
745 mmHg
81%
4.3
m/s
S
Climate normal
+5
0
27 December, Friday. day, 12°; night, 8°; heavy rain
28
+13
+8
28 December, sat
+13
+8
Feels like
+9
744 mmHg
83%
4.7
m/s
W
Climate normal
+3
0
28 December, Saturday. day, 13°; night, 8°; overcast
29
+9
+3
29 December, sun
+9
+3
Feels like
+2
746 mmHg
79%
4.9
m/s
W
Climate normal
+3
+1
29 December, Sunday. day, 9°; night, 3°; overcast
30
+8
+10
30 December, mon
+8
+10
Feels like
+1
748 mmHg
78%
3.7
m/s
W
Climate normal
+8
0
30 December, Monday. day, 8°; night, 10°; overcast
31
+12
+12
31 December, tue
+12
+12
Feels like
+5
736 mmHg
84%
7.7
m/s
W
Climate normal
+8
0
31 December, Tuesday. day, 12°; night, 12°; light rain
1 January
+10
+3
1 January, wed
+10
+3
Feels like
+1
745 mmHg
85%
8.5
m/s
W
Climate normal
+1
−2
1 January, Wednesday. day, 10°; night, 3°; light rain
2
+3
0
2 January, thu
+3
0
Feels like
−4
749 mmHg
74%
5.2
m/s
NW
Climate normal
−1
−4
2 January, Thursday. day, 3°; night, 0°; partly cloudy
3
+4
0
3 January, fri
+4
0
Feels like
−4
751 mmHg
73%
5.7
m/s
N
Climate normal
+2
−3
3 January, Friday. day, 4°; night, 0°; partly cloudy
4
+3
−2
4 January, sat
+3
−2
Feels like
−3
751 mmHg
72%
1.7
m/s
SE
Climate normal
+1
−1
4 January, Saturday. day, 3°; night, -2°; mostly clear
5
+6
0
5 January, sun
+6
0
Feels like
−4
746 mmHg
64%
5.4
m/s
S
Climate normal
+1
−3
5 January, Sunday. day, 6°; night, 0°; clear
6
+7
+4
6 January, mon
+7
+4
Feels like
−4
740 mmHg
62%
8
m/s
S
Climate normal
0
−2
6 January, Monday. day, 7°; night, 4°; clear
7
+7
0
7 January, tue
+7
0
Feels like
−6
734 mmHg
73%
12.4
m/s
S
Climate normal
+2
−2
7 January, Tuesday. day, 7°; night, 0°; clear
8
+7
+5
8 January, wed
+7
+5
Feels like
−4
733 mmHg
65%
10.4
m/s
W
Climate normal
+1
−2
8 January, Wednesday. day, 7°; night, 5°; mostly clear
9
+5
+2
9 January, thu
+5
+2
Feels like
−2
742 mmHg
87%
6.2
m/s
NW
Climate normal
+2
−2
9 January, Thursday. day, 5°; night, 2°; partly cloudy
10
+2
−3
10 January, fri
+2
−3
Feels like
−9
744 mmHg
77%
10.7
m/s
S
Climate normal
+3
−1
10 January, Friday. day, 2°; night, -3°; partly cloudy
11
+4
+4
11 January, sat
+4
+4
Feels like
−5
756 mmHg
70%
6.5
m/s
N
Climate normal
+6
+1
11 January, Saturday. day, 4°; night, 4°; partly cloudy
12
+1
−1
12 January, sun
+1
−1
Feels like
−5
750 mmHg
82%
5.2
m/s
S
Climate normal
+2
+2
12 January, Sunday. day, 1°; night, -1°; partly cloudy
13
+2
−1
13 January, mon
+2
−1
Feels like
−8
749 mmHg
77%
8
m/s
N
Climate normal
−1
−4
13 January, Monday. day, 2°; night, -1°; partly cloudy
14
+1
+1
14 January, tue
+1
+1
Feels like
−5
755 mmHg
98%
6.2
m/s
N
Climate normal
+2
−3
14 January, Tuesday. day, 1°; night, 1°; sleet
15
+1
−2
15 January, wed
+1
−2
Feels like
−7
748 mmHg
94%
6.3
m/s
S
Climate normal
0
−2
15 January, Wednesday. day, 1°; night, -2°; sleet
16
+1
−1
16 January, thu
+1
−1
Feels like
−10
737 mmHg
95%
8.2
m/s
S
Climate normal
+4
−2
16 January, Thursday. day, 1°; night, -1°; mostly clear
Average data for 10 years
Next, the average data for 10 years
17
+2
+2
17 January, fri
+2
+2
Feels like
−4
750 mmHg
75%
6.9
m/s
W
17 January, Friday. day, 2°; night, 2°; overcast
18
+3
−2
18 January, sat
+3
−2
Feels like
−1
752 mmHg
69%
5
m/s
W
18 January, Saturday. day, 3°; night, -2°; partly cloudy
Average for 30 days
8
sunny days
8
days with precipitation
14
cloudy days
8 sunny days; 8 days with precipitation; 14 cloudy days;
77
%
air humidity
6.1
m/s
Wind
S
18
mm of precipitation
(3% of annual average)
air humidity 77%; 18 millimeters of precipitation (3% of annual average); Wind southerly 6.1 Meters per second
Forecast in graphs
Temperature
Humidity, %
Wind, m/s
Pressure, mmHg
N
SW
NW
E
SE
S
S
S
SE
S
W
W
W
W
W
NW
N
SE
S
S
S
W
NW
S
N
S
N
N
S
S
18
Average data for 10 years
19
20
21
22
23
24
25
26
27
28
29
30
31
1
January
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Daytime temperature
Night-time temperature
