S
M
T
W
T
F
S
30
84°
51°
31
82°
48°
1
82°
45°
2
90°
52°
3
86°
62°
4
96°
59°
5
88°
65°
6
92°
66°
7
87°
56°
8
75°
55°
9
81°
49°
10
90°
47°
11
68°
46°
12
65°
42°
13
76°
39°
14
67°
52°
15
67°
47°
16
76°
44°
17
78°
40°
18
83°
58°
19
68°
54°
20
63°
50°
21
70°
53°
22
78°
52°
23
81°
53°
24
83°
57°
25
82°
52°
26
80°
46°
27
72°
46°
28
70°
45°
29
66°
46°
30
65°
42°
1
71°
46°
2
62°
47°
3
72°
46°
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 62° to 83°, with overnight lows between 42° and 58°. The average high for September is 73° 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.
