S
M
T
W
T
F
S
30
93°
72°
31
93°
73°
1
97°
68°
2
97°
68°
3
95°
73°
4
95°
75°
5
95°
72°
6
93°
72°
7
90°
73°
8
99°
71°
9
84°
58°
10
84°
63°
11
88°
62°
12
85°
60°
13
80°
59°
14
74°
54°
15
75°
53°
16
75°
54°
17
81°
56°
18
75°
57°
19
72°
54°
20
77°
51°
21
82°
58°
22
81°
57°
23
80°
58°
24
80°
58°
25
73°
57°
26
74°
57°
27
79°
56°
28
77°
57°
29
74°
56°
30
77°
50°
1
66°
45°
2
65°
42°
3
64°
41°
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 64° to 99°, with overnight lows between 41° and 73°. The average high for September is 78° with an average low of 56°. 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.
