S
M
T
W
T
F
S
30
100°
60°
31
100°
71°
1
101°
72°
2
102°
81°
3
101°
74°
4
102°
75°
5
106°
75°
6
105°
73°
7
97°
70°
8
103°
66°
9
100°
79°
10
97°
73°
11
89°
71°
12
93°
69°
13
95°
70°
14
96°
73°
15
98°
71°
16
97°
72°
17
96°
65°
18
93°
65°
19
88°
61°
20
85°
58°
21
80°
56°
22
82°
54°
23
84°
55°
24
85°
53°
25
79°
53°
26
84°
60°
27
84°
59°
28
83°
59°
29
82°
58°
30
83°
59°
1
83°
59°
2
82°
58°
3
83°
57°
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 79° to 98°, with overnight lows between 53° and 73°. The average high for September is 87° with an average low of 61°. 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.
