S
M
T
W
T
F
S
30
75°
59°
31
74°
57°
1
74°
59°
2
75°
59°
3
74°
60°
4
75°
58°
5
76°
56°
6
75°
57°
7
73°
55°
8
74°
56°
9
73°
61°
10
73°
55°
11
71°
54°
12
72°
54°
13
74°
61°
14
77°
55°
15
75°
60°
16
78°
61°
17
78°
61°
18
77°
60°
19
77°
57°
20
76°
52°
21
69°
58°
22
69°
57°
23
70°
59°
24
73°
58°
25
74°
52°
26
73°
48°
27
71°
49°
28
64°
50°
29
63°
50°
30
64°
48°
1
64°
53°
2
Hist. Avg.
68°
51°
3
Hist. Avg.
67°
51°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Westminster
Westminster's September 2026 forecast shows daily high temperatures ranging from 63° to 78°, with overnight lows between 48° and 61°. The average high for September is 73° with an average low of 56°. 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.
