Currently: 95 °F. Passing clouds. (Weather station: Lambert-St. Louis International Airport, USA). See more current weatherPast Weather in City of O'Fallon — Graph
°F
Time
Wind
(mph)
(mph)
Temp
(°F)
(°F)
65
68
71
74
77
80
83
86
89
92
95
98
Sun, Aug 3
Lo:77
12 pm
Hi:81
11
Lo:72
6 pm
Hi:77
7
Mon, Aug 4
Lo:66
12 am
Hi:70
3
Lo:66
6 am
Hi:81
3
Lo:81
12 pm
Hi:84
9
Lo:72
6 pm
Hi:82
9
Tue, Aug 5
Lo:66
12 am
Hi:72
7
Lo:66
6 am
Hi:81
4
Lo:81
12 pm
Hi:84
6
Lo:75
6 pm
Hi:82
7
Wed, Aug 6
Lo:72
12 am
Hi:73
2
Lo:72
6 am
Hi:88
4
Lo:88
12 pm
Hi:91
6
Lo:82
6 pm
Hi:90
9
Thu, Aug 7
Lo:75
12 am
Hi:81
5
Lo:77
6 am
Hi:90
7
Lo:84
12 pm
Hi:88
9
Lo:79
6 pm
Hi:84
4
Fri, Aug 8
Lo:75
12 am
Hi:77
6
Lo:77
6 am
Hi:91
10
Lo:91
12 pm
Hi:95
14
Lo:84
6 pm
Hi:91
14
Sat, Aug 9
Lo:77
12 am
Hi:82
10
Lo:77
6 am
Hi:90
9
Lo:90
12 pm
Hi:93
12
Lo:82
6 pm
Hi:90
12
Sun, Aug 10
Lo:77
12 am
Hi:82
9
Lo:79
6 am
Hi:90
12
Lo:73
12 pm
Hi:90
17
Lo:72
6 pm
Hi:73
7
Mon, Aug 11
Lo:73
12 am
Hi:75
7
Lo:73
6 am
Hi:88
7
Lo:90
12 pm
Hi:93
11
Lo:82
6 pm
Hi:90
10
Tue, Aug 12
Lo:79
12 am
Hi:82
6
Lo:79
6 am
Hi:90
7
Lo:75
12 pm
Hi:91
16
Lo:75
6 pm
Hi:81
2
Wed, Aug 13
Lo:72
12 am
Hi:75
2
Lo:72
6 am
Hi:84
4
Lo:86
12 pm
Hi:90
9
Lo:79
6 pm
Hi:86
7
Thu, Aug 14
Lo:72
12 am
Hi:77
4
Lo:72
6 am
Hi:84
1
Lo:84
12 pm
Hi:91
4
Lo:79
6 pm
Hi:88
4
Fri, Aug 15
Lo:77
12 am
Hi:81
4
Lo:79
6 am
Hi:93
7
Lo:93
12 pm
Hi:97
5
Lo:88
6 pm
Hi:95
9
Sat, Aug 16
Lo:81
12 am
Hi:86
6
Lo:79
6 am
Hi:93
7
Lo:82
12 pm
Hi:97
7
Lo:82
6 pm
Hi:88
6
Sun, Aug 17
Lo:81
12 am
Hi:84
4
Lo:81
6 am
Hi:93
2
Lo:79
12 pm
Hi:95
11
Lo:79
6 pm
Hi:84
7
Mon, Aug 18
Lo:79
12 am
Hi:82
2
Lo:81
6 am
Hi:93
8
Lo:93
12 pm
Hi:97
6
Sunday, August 3, 2025, 12:00 pm — 6:00 pm
81 / 77 °F
Partly sunny.
Humidity: 45%
Barometer: 30.05 "Hg
NE
Wind: 10.564 mph
City of O'Fallon Temperature Yesterday
Maximum temperature yesterday: 95 °F (at 3:51 pm)
Minimum temperature yesterday: 79 °F (at 5:58 pm)
Average temperature yesterday: 85 °F
High & Low Weather Summary for the Past Weeks
| Temperature | Humidity | Pressure | |
|---|---|---|---|
| High | 97 °F (Aug 15, 1:51 pm) | 93% (Aug 5, 3:16 am) | 30.22 "Hg (Aug 5, 3:16 am) |
| Low | 66 °F (Aug 4, 6:51 am) | 37% (Aug 15, 2:51 pm) | 29.88 "Hg (Aug 12, 7:51 pm) |
| Average | 82 °F | 66% | 30.02 "Hg |
| * Reported Aug 3 2:51 pm — Aug 18 2:51 pm, City of O'Fallon. Weather by CustomWeather, © 2025 | |||
Note: Actual official high and low records may vary slightly from our data, if they occured in-between our weather recording intervals... More about our weather records
City of O'Fallon Weather History for the Previous 24 Hours
Scroll right to see more
| Conditions | Comfort | |||||||
|---|---|---|---|---|---|---|---|---|
| Time | Temp | Weather | Wind | Humidity | Barometer | Visibility | ||
| 2:51 pm Mon, Aug 18 | | 96 °F | Passing clouds. | 9 mph | ↑ | 47% | 29.95 "Hg | 10 mi |
| 1:51 pm | | 95 °F | Passing clouds. | 8 mph | ↑ | 49% | 29.96 "Hg | 10 mi |
| 12:51 pm | | 93 °F | Passing clouds. | No wind | ↑ | 49% | 29.98 "Hg | 10 mi |
| 11:51 am | | 93 °F | Scattered clouds. | 8 mph | ↑ | 50% | 30.01 "Hg | 10 mi |
| 10:51 am | | 92 °F | Passing clouds. | 10 mph | ↑ | 54% | 30.03 "Hg | 10 mi |
| 9:51 am | | 89 °F | Passing clouds. | 8 mph | ↑ | 59% | 30.03 "Hg | 10 mi |
| 8:51 am | | 85 °F | Passing clouds. | 8 mph | ↑ | 70% | 30.02 "Hg | 10 mi |
| 7:51 am | | 82 °F | Passing clouds. | 7 mph | ↑ | 74% | 30.01 "Hg | 10 mi |
| 6:51 am | | 81 °F | Passing clouds. | 6 mph | ↑ | 77% | 29.98 "Hg | 10 mi |
| 5:51 am |  | 79 °F | Passing clouds. | No wind | ↑ | 82% | 29.98 "Hg | 10 mi |
| 4:51 am |  | 79 °F | Clear. | No wind | ↑ | 82% | 29.96 "Hg | 10 mi |
| 3:51 am | | 78 °F | Passing clouds. | 3 mph | ↑ | 87% | 29.96 "Hg | 10 mi |
| 2:51 am | | 79 °F | Passing clouds. | No wind | ↑ | 84% | 29.96 "Hg | 10 mi |
| 1:51 am | | 80 °F | Passing clouds. | 3 mph | ↑ | 81% | 29.97 "Hg | 10 mi |
| 12:51 am | | 83 °F | Passing clouds. | 5 mph | ↑ | 72% | 29.97 "Hg | 10 mi |
| 11:51 pm Sun, Aug 17 | | 81 °F | Passing clouds. | No wind | ↑ | 82% | 29.96 "Hg | 10 mi |
| 10:51 pm | | 81 °F | Passing clouds. | No wind | ↑ | 85% | 29.95 "Hg | 10 mi |
| 9:51 pm | | 81 °F | Passing clouds. | 3 mph | ↑ | 85% | 29.96 "Hg | 10 mi |
| 8:51 pm | | 80 °F | Passing clouds. | No wind | ↑ | 87% | 29.96 "Hg | 10 mi |
| 7:51 pm |  | 81 °F | Broken clouds. | No wind | ↑ | 85% | 29.93 "Hg | 10 mi |
| 6:51 pm |  | 84 °F | Light rain. Broken clouds. | 7 mph | ↑ | 63% | 29.94 "Hg | 10 mi |
| 6:40 pm |  | 84 °F | Thunderstorms. Broken clouds. | 12 mph | ↑ | 65% | 29.98 "Hg | 8 mi |
| 6:27 pm |  | 82 °F | Strong thunderstorms. Partly sunny. | 23 mph | ↑ | 60% | 30.00 "Hg | 3 mi |
| 5:58 pm | | 79 °F | Strong thunderstorms. Partly sunny. | 22 mph | ↑ | 74% | 29.99 "Hg | 1 mi |
| 5:21 pm | | 89 °F | Thunderstorms. Partly sunny. | 6 mph | ↑ | 59% | 29.99 "Hg | 10 mi |
| 4:51 pm | | 95 °F | Broken clouds. | 8 mph | ↑ | 47% | 29.95 "Hg | 10 mi |
| Weather by CustomWeather, © 2025 | ||||||||