S
M
T
W
T
F
S
30
84°
68°
31
86°
69°
1
94°
70°
2
94°
70°
3
94°
70°
4
90°
65°
5
83°
61°
6
81°
58°
7
82°
59°
8
87°
60°
9
89°
65°
10
82°
59°
11
81°
67°
12
80°
64°
13
83°
54°
14
72°
59°
15
88°
66°
16
88°
65°
17
80°
58°
18
75°
53°
19
72°
51°
20
71°
47°
21
71°
49°
22
75°
51°
23
77°
52°
24
74°
50°
25
75°
55°
26
78°
54°
27
78°
55°
28
77°
54°
29
76°
54°
30
77°
53°
1
74°
50°
2
69°
52°
3
76°
53°
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 69° to 88°, with overnight lows between 47° and 67°. The average high for September is 77° with an average low of 55°. 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.
