S
M
T
W
T
F
S
30
74°
55°
31
75°
58°
1
81°
58°
2
81°
56°
3
79°
51°
4
79°
56°
5
78°
52°
6
79°
50°
7
71°
54°
8
70°
55°
9
71°
50°
10
77°
46°
11
71°
55°
12
74°
49°
13
77°
50°
14
73°
47°
15
69°
53°
16
69°
46°
17
76°
45°
18
69°
47°
19
Hist. Avg.
72°
46°
20
Hist. Avg.
72°
45°
21
Hist. Avg.
71°
45°
22
Hist. Avg.
71°
45°
23
Hist. Avg.
71°
44°
24
Hist. Avg.
70°
44°
25
Hist. Avg.
70°
43°
26
Hist. Avg.
69°
43°
27
Hist. Avg.
69°
42°
28
Hist. Avg.
69°
42°
29
Hist. Avg.
68°
41°
30
Hist. Avg.
68°
41°
1
Hist. Avg.
67°
41°
2
Hist. Avg.
67°
40°
3
Hist. Avg.
66°
40°
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 69° to 81°, with overnight lows between 45° and 58°. The average high for September is 75° with an average low of 52°. 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.
