S
M
T
W
T
F
S
30
89°
63°
31
88°
62°
1
85°
62°
2
85°
66°
3
83°
66°
4
85°
65°
5
87°
65°
6
88°
66°
7
87°
62°
8
86°
60°
9
83°
59°
10
84°
60°
11
84°
60°
12
85°
62°
13
85°
63°
14
Hist. Avg.
82°
62°
15
Hist. Avg.
82°
62°
16
Hist. Avg.
81°
61°
17
Hist. Avg.
81°
61°
18
Hist. Avg.
81°
61°
19
Hist. Avg.
80°
60°
20
Hist. Avg.
80°
60°
21
Hist. Avg.
80°
60°
22
Hist. Avg.
80°
59°
23
Hist. Avg.
79°
59°
24
Hist. Avg.
79°
58°
25
Hist. Avg.
78°
58°
26
Hist. Avg.
78°
58°
27
Hist. Avg.
78°
57°
28
Hist. Avg.
78°
57°
29
Hist. Avg.
77°
56°
30
Hist. Avg.
77°
56°
1
Hist. Avg.
76°
56°
2
Hist. Avg.
76°
55°
3
Hist. Avg.
76°
55°
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 83° to 89°, with overnight lows between 59° and 66°. The average high for September is 86° with an average low of 63°. 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.
