S
M
T
W
T
F
S
30
91°
57°
31
89°
59°
1
86°
59°
2
93°
58°
3
93°
56°
4
96°
59°
5
96°
60°
6
87°
62°
7
89°
65°
8
85°
59°
9
78°
55°
10
89°
60°
11
93°
56°
12
72°
52°
13
82°
52°
14
90°
59°
15
70°
50°
16
82°
60°
17
79°
59°
18
84°
57°
19
80°
53°
20
75°
47°
21
75°
47°
22
73°
49°
23
74°
48°
24
79°
52°
25
78°
51°
26
79°
49°
27
80°
50°
28
75°
42°
29
77°
46°
30
70°
47°
1
78°
46°
2
73°
48°
3
78°
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 70° to 84°, with overnight lows between 42° and 60°. The average high for September is 77° 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.
