S
M
T
W
T
F
S
30
80°
57°
31
82°
57°
1
76°
56°
2
75°
56°
3
74°
53°
4
73°
50°
5
73°
56°
6
83°
55°
7
72°
45°
8
71°
43°
9
70°
41°
10
69°
39°
11
72°
46°
12
70°
39°
13
73°
41°
14
69°
42°
15
75°
47°
16
77°
50°
17
80°
51°
18
81°
51°
19
82°
52°
20
82°
50°
21
83°
53°
22
81°
51°
23
81°
50°
24
79°
39°
25
75°
35°
26
64°
36°
27
64°
40°
28
65°
41°
29
63°
45°
30
72°
43°
1
73°
45°
2
72°
46°
3
75°
44°
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 63° to 83°, with overnight lows between 35° and 57°. The average high for September is 74° with an average low of 47°. 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.
