S
M
T
W
T
F
S
30
81°
67°
31
82°
66°
1
82°
65°
2
83°
64°
3
83°
63°
4
81°
61°
5
81°
61°
6
80°
62°
7
80°
62°
8
81°
64°
9
82°
66°
10
81°
65°
11
83°
66°
12
80°
62°
13
79°
68°
14
84°
69°
15
Hist. Avg.
82°
63°
16
Hist. Avg.
82°
63°
17
Hist. Avg.
82°
63°
18
Hist. Avg.
82°
63°
19
Hist. Avg.
82°
63°
20
Hist. Avg.
81°
63°
21
Hist. Avg.
81°
63°
22
Hist. Avg.
81°
63°
23
Hist. Avg.
81°
62°
24
Hist. Avg.
81°
62°
25
Hist. Avg.
80°
62°
26
Hist. Avg.
80°
62°
27
Hist. Avg.
80°
62°
28
Hist. Avg.
80°
62°
29
Hist. Avg.
80°
62°
30
Hist. Avg.
79°
61°
1
Hist. Avg.
79°
61°
2
Hist. Avg.
79°
61°
3
Hist. Avg.
79°
61°
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 79° to 84°, with overnight lows between 61° and 69°. The average high for September is 81° with an average low of 64°. 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.
