S
M
T
W
T
F
S
30
70°
56°
31
79°
51°
1
76°
52°
2
77°
53°
3
79°
48°
4
84°
46°
5
83°
46°
6
85°
42°
7
78°
49°
8
79°
42°
9
77°
35°
10
81°
53°
11
78°
42°
12
81°
56°
13
81°
52°
14
74°
42°
15
73°
46°
16
79°
45°
17
76°
45°
18
78°
47°
19
75°
48°
20
72°
47°
21
70°
42°
22
69°
41°
23
67°
37°
24
69°
44°
25
61°
38°
26
61°
40°
27
72°
44°
28
71°
43°
29
63°
42°
30
63°
36°
1
66°
42°
2
69°
41°
3
69°
41°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Sinclair
Sinclair's September 2026 forecast shows daily high temperatures ranging from 61° to 81°, with overnight lows between 36° and 56°. The average high for September is 72° with an average low of 44°. 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 Sinclair. See also: October | November | December.
