S
M
T
W
T
F
S
30
76°
60°
31
66°
60°
1
78°
65°
2
69°
64°
3
79°
64°
4
75°
62°
5
72°
58°
6
71°
54°
7
73°
51°
8
73°
57°
9
76°
66°
10
73°
51°
11
66°
47°
12
71°
55°
13
72°
55°
14
69°
57°
15
72°
56°
16
67°
50°
17
67°
50°
18
61°
46°
19
60°
45°
20
62°
43°
21
61°
45°
22
61°
50°
23
62°
49°
24
63°
49°
25
64°
48°
26
68°
46°
27
62°
42°
28
65°
47°
29
68°
49°
30
69°
49°
1
68°
48°
2
67°
48°
3
66°
45°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Sidney
Sidney's September 2026 forecast shows daily high temperatures ranging from 60° to 76°, with overnight lows between 42° and 66°. The average high for September is 67° with an average low of 50°. 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 Sidney. See also: October | November | December.
