Currently: 66 °F. Mostly cloudy. (Weather station: Allegheny County Airport, USA). See more current weatherSeptember 2018 Weather in Pittsburgh — Graph
°F
Time
Wind
(mph)
(mph)
Temp
(°F)
(°F)
47
51
55
59
63
67
71
75
79
83
87
91
Sat, Sep 1
Lo:66
12 am
Hi:72
5
Lo:66
6 am
Hi:79
6
Lo:79
12 pm
Hi:82
7
Lo:72
6 pm
Hi:81
7
Sun, Sep 2
Lo:68
12 am
Hi:72
6
Lo:68
6 am
Hi:81
6
Lo:81
12 pm
Hi:88
7
Lo:75
6 pm
Hi:84
6
Mon, Sep 3
Lo:70
12 am
Hi:73
4
Lo:70
6 am
Hi:86
4
Lo:88
12 pm
Hi:90
7
Lo:77
6 pm
Hi:88
4
Tue, Sep 4
Lo:70
12 am
Hi:75
2
Lo:70
6 am
Hi:88
3
Lo:88
12 pm
Hi:91
4
Lo:79
6 pm
Hi:88
4
Wed, Sep 5
Lo:72
12 am
Hi:77
5
Lo:72
6 am
Hi:86
8
Lo:88
12 pm
Hi:91
9
Lo:81
6 pm
Hi:88
6
Thu, Sep 6
Lo:72
12 am
Hi:75
5
Lo:73
6 am
Hi:82
5
Lo:68
12 pm
Hi:81
4
Lo:72
6 pm
Hi:75
2
Fri, Sep 7
Lo:68
12 am
Hi:72
1
Lo:68
6 am
Hi:77
2
Lo:79
12 pm
Hi:81
4
Lo:70
6 pm
Hi:73
4
Sat, Sep 8
Lo:64
12 am
Hi:70
6
Lo:59
6 am
Hi:64
8
Lo:57
12 pm
Hi:61
7
Lo:52
6 pm
Hi:55
7
Sun, Sep 9
Lo:52
12 am
Hi:54
7
Lo:54
6 am
Hi:55
10
Lo:55
12 pm
Hi:57
11
Lo:57
6 pm
Hi:57
12
Mon, Sep 10
Lo:55
12 am
Hi:57
12
Lo:57
6 am
Hi:61
10
Lo:63
12 pm
Hi:64
8
Lo:63
6 pm
Hi:66
4
Tue, Sep 11
Lo:61
12 am
Hi:63
3
Lo:61
6 am
Hi:66
1
Lo:66
12 pm
Hi:68
1
Lo:63
6 pm
Hi:66
2
Wed, Sep 12
Lo:61
12 am
Hi:63
1
Lo:61
6 am
Hi:70
4
Lo:70
12 pm
Hi:75
3
Lo:70
6 pm
Hi:73
4
Thu, Sep 13
Lo:66
12 am
Hi:70
2
Lo:66
6 am
Hi:79
4
Lo:79
12 pm
Hi:82
4
Lo:72
6 pm
Hi:77
6
Fri, Sep 14
Lo:68
12 am
Hi:72
2
Lo:66
6 am
Hi:79
6
Lo:79
12 pm
Hi:82
7
Lo:70
6 pm
Hi:79
6
Sat, Sep 15
Lo:66
12 am
Hi:70
4
Lo:66
6 am
Hi:79
6
Lo:77
12 pm
Hi:82
7
Lo:72
6 pm
Hi:79
4
Sun, Sep 16
Lo:64
12 am
Hi:68
4
Lo:64
6 am
Hi:75
6
Lo:77
12 pm
Hi:81
9
Lo:70
6 pm
Hi:75
6
Mon, Sep 17
Lo:66
12 am
Hi:68
6
Lo:68
6 am
Hi:70
6
Lo:70
12 pm
Hi:73
7
Lo:70
6 pm
Hi:72
1
Tue, Sep 18
Lo:66
12 am
Hi:70
7
Lo:66
6 am
Hi:70
6
Lo:73
12 pm
Hi:81
5
Lo:70
6 pm
Hi:77
1
Wed, Sep 19
Lo:64
12 am
Hi:70
3
Lo:66
6 am
Hi:75
4
Lo:77
12 pm
Hi:81
4
Lo:68
6 pm
Hi:77
4
Thu, Sep 20
Lo:63
12 am
Hi:66
1
Lo:61
6 am
Hi:77
4
Lo:81
12 pm
Hi:82
6
Lo:72
6 pm
Hi:81
6
Fri, Sep 21
Lo:70
12 am
Hi:72
7
Lo:70
6 am
Hi:82
14
Lo:84
12 pm
Hi:86
17
Lo:68
6 pm
Hi:81
14
Sat, Sep 22
Lo:59
12 am
Hi:70
7
Lo:57
6 am
Hi:59
5
Lo:57
12 pm
Hi:61
6
Lo:55
6 pm
Hi:57
2
Sun, Sep 23
Lo:54
12 am
Hi:55
2
Lo:54
6 am
Hi:63
1
Lo:66
12 pm
Hi:66
4
Lo:57
6 pm
Hi:64
6
Mon, Sep 24
Lo:55
12 am
Hi:57
7
Lo:57
6 am
Hi:68
10
Lo:63
12 pm
Hi:66
11
Lo:61
6 pm
Hi:61
9
Tue, Sep 25
Lo:61
12 am
Hi:63
9
Lo:63
6 am
Hi:70
9
Lo:70
12 pm
Hi:72
9
Lo:68
6 pm
Hi:70
7
Wed, Sep 26
Lo:68
12 am
Hi:70
9
Lo:68
6 am
Hi:73
11
Lo:64
12 pm
Hi:75
8
Lo:55
6 pm
Hi:64
6
Thu, Sep 27
Lo:54
12 am
Hi:57
2
Lo:54
6 am
Hi:61
4
Lo:55
12 pm
Hi:63
7
Lo:55
6 pm
Hi:55
6
Fri, Sep 28
Lo:55
12 am
Hi:55
1
Lo:55
6 am
Hi:63
6
Lo:64
12 pm
Hi:70
9
Lo:59
6 pm
Hi:64
6
Sat, Sep 29
Lo:52
12 am
Hi:57
6
Lo:52
6 am
Hi:61
4
Lo:61
12 pm
Hi:63
2
Lo:54
6 pm
Hi:61
2
Sun, Sep 30
Lo:48
12 am
Hi:52
3
Lo:48
6 am
Hi:66
2
Lo:70
12 pm
Hi:75
6
Lo:61
6 pm
Hi:72
5
Saturday, September 1, 2018, 12:00 am — 6:00 am
72 / 66 °F
Clear.
Humidity: 93%
Barometer: 30.17 "Hg
SSE
Wind: 4.971 mph
High & Low Weather Summary for September 2018
| Temperature | Humidity | Pressure | |
|---|---|---|---|
| High | 91 °F (Sep 4, 3:53 pm) | 100% (Sep 2, 2:53 am) | 30.33 "Hg (Sep 2, 2:53 am) |
| Low | 48 °F (Sep 30, 4:53 am) | 44% (Sep 4, 3:53 pm) | 29.82 "Hg (Sep 17, 5:53 pm) |
| Average | 68 °F | 86% | 30.12 "Hg |
| * Reported Sep 1 12:53 am — Sep 30 11:53 pm, Pittsburgh. 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
Pittsburgh Weather History for September 1, 2018
Scroll right to see more
| Conditions | Comfort | |||||||
|---|---|---|---|---|---|---|---|---|
| Time | Temp | Weather | Wind | Humidity | Barometer | Visibility | ||
| 12:53 am Sat, Sep 1 |  | 71 °F | Passing clouds. | 6 mph | ↑ | 90% | 30.18 "Hg | 10 mi |
| 1:53 am |  | 69 °F | Clear. | 5 mph | ↑ | 93% | 30.17 "Hg | 10 mi |
| 2:53 am | | 68 °F | Clear. | 5 mph | ↑ | 93% | 30.16 "Hg | 10 mi |
| 3:53 am | | 69 °F | Clear. | 6 mph | ↑ | 90% | 30.17 "Hg | 10 mi |
| 4:53 am | | 68 °F | Clear. | 6 mph | ↑ | 93% | 30.17 "Hg | 10 mi |
| 5:53 am | | 67 °F | Clear. | 5 mph | ↑ | 97% | 30.18 "Hg | 10 mi |
| 6:53 am |  | 67 °F | Sunny. | 6 mph | ↑ | 97% | 30.18 "Hg | 7 mi |
| 7:53 am | | 69 °F | Sunny. | 7 mph | ↑ | 93% | 30.19 "Hg | 9 mi |
| 8:53 am | | 72 °F | Sunny. | 5 mph | ↑ | 87% | 30.21 "Hg | 10 mi |
| 9:53 am | | 76 °F | Sunny. | 7 mph | ↑ | 80% | 30.21 "Hg | 10 mi |
| 10:53 am |  | 77 °F | Passing clouds. | 7 mph | ↑ | 74% | 30.21 "Hg | 10 mi |
| 11:53 am |  | 79 °F | Partly sunny. | 7 mph | ↑ | 72% | 30.22 "Hg | 10 mi |
| 12:53 pm | | 79 °F | Partly sunny. | 7 mph | ↑ | 74% | 30.21 "Hg | 10 mi |
| 1:53 pm | | 80 °F | Partly sunny. | 5 mph | ↑ | 69% | 30.20 "Hg | 10 mi |
| 2:53 pm | | 83 °F | Passing clouds. | No wind | ↑ | 61% | 30.18 "Hg | 10 mi |
| 4:53 pm | | 83 °F | Broken clouds. | 8 mph | ↑ | 61% | 30.14 "Hg | 10 mi |
| 5:53 pm | | 83 °F | Scattered clouds. | 14 mph | ↑ | 61% | 30.14 "Hg | 10 mi |
| 6:53 pm | | 80 °F | Sunny. | 7 mph | ↑ | 69% | 30.14 "Hg | 10 mi |
| 7:53 pm | | 77 °F | Clear. | 6 mph | ↑ | 79% | 30.16 "Hg | 10 mi |
| 8:53 pm | | 76 °F | Clear. | 8 mph | ↑ | 82% | 30.18 "Hg | 10 mi |
| 9:53 pm | | 74 °F | Clear. | 8 mph | ↑ | 91% | 30.16 "Hg | 10 mi |
| 10:53 pm | | 73 °F | Clear. | 6 mph | ↑ | 90% | 30.16 "Hg | 10 mi |
| 11:53 pm | | 72 °F | Clear. | 8 mph | ↑ | 91% | 30.18 "Hg | 10 mi |
| Weather by CustomWeather, © 2025 | ||||||||