Currently: 90 °F. Broken clouds. (Weather station: Lambert-St. Louis International Airport, USA). See more current weatherSeptember 2018 Weather in St. Louis — Graph
°F
Time
Wind
(mph)
(mph)
Temp
(°F)
(°F)
50
54
58
62
66
70
74
78
82
86
90
94
Sat, Sep 1
Lo:75
12 am
Hi:79
7
Lo:75
6 am
Hi:84
9
Lo:88
12 pm
Hi:91
13
Lo:81
6 pm
Hi:86
11
Sun, Sep 2
Lo:73
12 am
Hi:79
4
Lo:73
6 am
Hi:88
11
Lo:90
12 pm
Hi:90
16
Lo:81
6 pm
Hi:88
7
Mon, Sep 3
Lo:73
12 am
Hi:81
6
Lo:75
6 am
Hi:90
7
Lo:90
12 pm
Hi:91
15
Lo:82
6 pm
Hi:88
9
Tue, Sep 4
Lo:75
12 am
Hi:81
6
Lo:75
6 am
Hi:90
9
Lo:90
12 pm
Hi:91
14
Lo:82
6 pm
Hi:88
9
Wed, Sep 5
Lo:75
12 am
Hi:81
4
Lo:73
6 am
Hi:91
4
Lo:91
12 pm
Hi:91
11
Lo:82
6 pm
Hi:90
7
Thu, Sep 6
Lo:75
12 am
Hi:75
4
Lo:73
6 am
Hi:84
6
Lo:82
12 pm
Hi:86
9
Lo:77
6 pm
Hi:82
9
Fri, Sep 7
Lo:73
12 am
Hi:75
7
Lo:73
6 am
Hi:79
8
Lo:75
12 pm
Hi:82
9
Lo:70
6 pm
Hi:75
14
Sat, Sep 8
Lo:68
12 am
Hi:70
14
Lo:66
6 am
Hi:68
17
Lo:68
12 pm
Hi:70
16
Lo:63
6 pm
Hi:68
14
Sun, Sep 9
Lo:61
12 am
Hi:63
10
Lo:61
6 am
Hi:64
9
Lo:66
12 pm
Hi:75
11
Lo:66
6 pm
Hi:73
7
Mon, Sep 10
Lo:61
12 am
Hi:66
3
Lo:59
6 am
Hi:73
3
Lo:75
12 pm
Hi:79
5
Lo:64
6 pm
Hi:75
3
Tue, Sep 11
Lo:61
12 am
Hi:63
1
Lo:63
6 am
Hi:79
1
Lo:79
12 pm
Hi:82
7
Lo:72
6 pm
Hi:79
6
Wed, Sep 12
Lo:63
12 am
Hi:66
3
Lo:63
6 am
Hi:77
3
Lo:77
12 pm
Hi:81
7
Lo:72
6 pm
Hi:75
7
Thu, Sep 13
Lo:66
12 am
Hi:70
2
Lo:66
6 am
Hi:79
4
Lo:81
12 pm
Hi:84
6
Lo:75
6 pm
Hi:82
2
Fri, Sep 14
Lo:72
12 am
Hi:73
0
Lo:68
6 am
Hi:84
2
Lo:86
12 pm
Hi:90
3
Lo:77
6 pm
Hi:84
1
Sat, Sep 15
Lo:70
12 am
Hi:75
1
Lo:70
6 am
Hi:88
3
Lo:88
12 pm
Hi:90
9
Lo:77
6 pm
Hi:88
6
Sun, Sep 16
Lo:70
12 am
Hi:75
3
Lo:70
6 am
Hi:88
2
Lo:88
12 pm
Hi:90
6
Lo:79
6 pm
Hi:88
2
Mon, Sep 17
Lo:72
12 am
Hi:75
2
Lo:73
6 am
Hi:90
4
Lo:91
12 pm
Hi:93
8
Lo:79
6 pm
Hi:88
6
Tue, Sep 18
Lo:73
12 am
Hi:79
1
Lo:75
6 am
Hi:91
4
Lo:91
12 pm
Hi:93
4
Lo:77
6 pm
Hi:90
6
Wed, Sep 19
Lo:73
12 am
Hi:75
2
Lo:73
6 am
Hi:86
4
Lo:84
12 pm
Hi:91
9
Lo:81
6 pm
Hi:84
6
Thu, Sep 20
Lo:75
12 am
Hi:79
4
Lo:75
6 am
Hi:91
9
Lo:91
12 pm
Hi:93
15
Lo:82
6 pm
Hi:90
11
Fri, Sep 21
Lo:77
12 am
Hi:81
14
Lo:75
6 am
Hi:79
12
Lo:73
12 pm
Hi:82
12
Lo:66
6 pm
Hi:70
11
Sat, Sep 22
Lo:61
12 am
Hi:64
10
Lo:59
6 am
Hi:64
9
Lo:66
12 pm
Hi:70
7
Lo:61
6 pm
Hi:68
7
Sun, Sep 23
Lo:55
12 am
Hi:59
4
Lo:57
6 am
Hi:73
6
Lo:75
12 pm
Hi:79
9
Lo:70
6 pm
Hi:75
7
Mon, Sep 24
Lo:66
12 am
Hi:70
8
Lo:66
6 am
Hi:75
7
Lo:75
12 pm
Hi:79
9
Lo:73
6 pm
Hi:79
6
Tue, Sep 25
Lo:72
12 am
Hi:73
4
Lo:72
6 am
Hi:81
6
Lo:81
12 pm
Hi:88
9
Lo:72
6 pm
Hi:82
9
Wed, Sep 26
Lo:57
12 am
Hi:66
11
Lo:54
6 am
Hi:68
9
Lo:66
12 pm
Hi:70
9
Lo:61
6 pm
Hi:64
6
Thu, Sep 27
Lo:55
12 am
Hi:61
4
Lo:54
6 am
Hi:66
2
Lo:70
12 pm
Hi:73
3
Lo:61
6 pm
Hi:70
9
Fri, Sep 28
Lo:57
12 am
Hi:61
7
Lo:57
6 am
Hi:73
6
Lo:73
12 pm
Hi:77
8
Lo:54
6 pm
Hi:64
11
Sat, Sep 29
Lo:54
12 am
Hi:54
8
Lo:52
6 am
Hi:59
9
Lo:63
12 pm
Hi:73
9
Lo:64
6 pm
Hi:70
7
Sun, Sep 30
Lo:61
12 am
Hi:64
4
Lo:59
6 am
Hi:79
5
Lo:81
12 pm
Hi:84
4
Lo:70
6 pm
Hi:79
7
Saturday, September 1, 2018, 12:00 am — 6:00 am
79 / 75 °F
Passing clouds.
Humidity: 86%
Barometer: 29.96 "Hg
S
Wind: 6.836 mph
High & Low Weather Summary for September 2018
| Temperature | Humidity | Pressure | |
|---|---|---|---|
| High | 94 °F (Sep 20, 1:51 pm) | 100% (Sep 7, 11:51 pm) | 30.32 "Hg (Sep 7, 11:51 pm) |
| Low | 52 °F (Sep 29, 6:51 am) | 33% (Sep 28, 3:51 pm) | 29.81 "Hg (Sep 25, 4:51 pm) |
| Average | 75 °F | 70% | 30.03 "Hg |
| * Reported Sep 1 12:51 am — Sep 30 11:51 pm, St. Louis. 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
St. Louis Weather History for September 1, 2018
Scroll right to see more
| Conditions | Comfort | |||||||
|---|---|---|---|---|---|---|---|---|
| Time | Temp | Weather | Wind | Humidity | Barometer | Visibility | ||
| 12:51 am Sat, Sep 1 |  | 79 °F | Passing clouds. | 10 mph | ↑ | 84% | 29.96 "Hg | 10 mi |
| 1:51 am | | 78 °F | Passing clouds. | 8 mph | ↑ | 87% | 29.96 "Hg | 10 mi |
| 2:51 am | | 77 °F | Passing clouds. | 8 mph | ↑ | 85% | 29.96 "Hg | 10 mi |
| 3:51 am | | 76 °F | Passing clouds. | 3 mph | ↑ | 85% | 29.96 "Hg | 10 mi |
| 4:51 am | | 75 °F | Passing clouds. | 3 mph | ↑ | 88% | 29.96 "Hg | 10 mi |
| 5:51 am |  | 75 °F | Partly cloudy. | 8 mph | ↑ | 88% | 29.97 "Hg | 10 mi |
| 6:51 am | | 75 °F | Partly sunny. | 8 mph | ↑ | 88% | 30.01 "Hg | 10 mi |
| 7:51 am | | 76 °F | Partly sunny. | 10 mph | ↑ | 88% | 30.01 "Hg | 10 mi |
| 8:51 am | | 78 °F | Partly sunny. | 7 mph | ↑ | 82% | 30.03 "Hg | 10 mi |
| 9:51 am | | 79 °F | Partly sunny. | 9 mph | ↑ | 79% | 30.04 "Hg | 10 mi |
| 10:51 am | | 82 °F | Partly sunny. | 9 mph | ↑ | 74% | 30.05 "Hg | 10 mi |
| 11:51 am | | 84 °F | Broken clouds. | 9 mph | ↑ | 70% | 30.05 "Hg | 10 mi |
| 12:51 pm | | 87 °F | Broken clouds. | 10 mph | ↑ | 63% | 30.02 "Hg | 10 mi |
| 1:51 pm | | 89 °F | Broken clouds. | 13 mph | ↑ | 59% | 30.00 "Hg | 10 mi |
| 2:51 pm | | 90 °F | Broken clouds. | 14 mph | ↑ | 57% | 29.98 "Hg | 10 mi |
| 3:51 pm | | 91 °F | Partly sunny. | 10 mph | ↑ | 54% | 29.96 "Hg | 10 mi |
| 4:51 pm |  | 88 °F | Scattered clouds. | 15 mph | ↑ | 59% | 29.96 "Hg | 10 mi |
| 5:51 pm | | 88 °F | Passing clouds. | 16 mph | ↑ | 57% | 29.96 "Hg | 10 mi |
| 6:51 pm | | 86 °F | Passing clouds. | 14 mph | ↑ | 61% | 29.96 "Hg | 10 mi |
| 7:51 pm | | 84 °F | Passing clouds. | 9 mph | ↑ | 65% | 29.96 "Hg | 10 mi |
| 8:51 pm |  | 83 °F | Clear. | 12 mph | ↑ | 70% | 29.96 "Hg | 10 mi |
| 9:51 pm | | 82 °F | Clear. | 14 mph | ↑ | 72% | 29.96 "Hg | 10 mi |
| 10:51 pm | | 81 °F | Clear. | 8 mph | ↑ | 72% | 29.98 "Hg | 10 mi |
| 11:51 pm | | 80 °F | Clear. | 6 mph | ↑ | 74% | 29.99 "Hg | 10 mi |
| Weather by CustomWeather, © 2025 | ||||||||