S
M
T
W
T
F
S
30
73°
63°
31
72°
59°
1
72°
57°
2
70°
63°
3
79°
66°
4
70°
59°
5
73°
55°
6
81°
59°
7
77°
64°
8
64°
57°
9
66°
54°
10
70°
57°
11
N/A
12
73°
63°
13
72°
62°
14
75°
62°
15
69°
52°
16
66°
54°
17
68°
52°
18
67°
55°
19
69°
56°
20
70°
56°
21
69°
54°
22
67°
54°
23
67°
54°
24
66°
54°
25
65°
47°
26
66°
50°
27
65°
49°
28
65°
49°
29
64°
48°
30
65°
46°
1
65°
45°
2
64°
48°
3
65°
48°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Westminster
Westminster's September 2026 forecast shows daily high temperatures ranging from 64° to 75°, with overnight lows between 45° and 63°. The average high for September is 67° with an average low of 53°. 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 Westminster. See also: October | November | December.
