S
M
T
W
T
F
S
30
87°
67°
31
90°
68°
1
93°
69°
2
94°
71°
3
92°
69°
4
96°
70°
5
81°
67°
6
80°
63°
7
81°
59°
8
85°
58°
9
88°
61°
10
91°
69°
11
81°
71°
12
78°
69°
13
88°
70°
14
82°
59°
15
78°
53°
16
85°
57°
17
92°
65°
18
85°
65°
19
80°
67°
20
83°
67°
21
71°
64°
22
65°
58°
23
58°
54°
24
63°
47°
25
76°
44°
26
77°
56°
27
75°
58°
28
76°
55°
29
74°
59°
30
80°
56°
1
86°
57°
2
90°
59°
3
69°
53°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Commonwealth
Commonwealth's September 2026 forecast shows daily high temperatures ranging from ° to °, with overnight lows between ° and °. The average high for September is ° with an average low of °. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how September weather will actually feel in Commonwealth. See also: October | November | December.
