S
M
T
W
T
F
S
30
84°
61°
31
77°
56°
1
76°
53°
2
76°
54°
3
77°
59°
4
84°
62°
5
82°
61°
6
83°
62°
7
82°
59°
8
83°
60°
9
84°
60°
10
83°
58°
11
83°
60°
12
80°
59°
13
83°
58°
14
85°
48°
15
80°
47°
16
71°
47°
17
72°
48°
18
73°
56°
19
78°
57°
20
75°
57°
21
73°
54°
22
77°
51°
23
80°
53°
24
81°
55°
25
82°
55°
26
82°
56°
27
80°
45°
28
80°
43°
29
70°
49°
30
67°
48°
1
68°
50°
2
69°
48°
3
66°
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 66° to 85°, with overnight lows between 43° and 62°. The average high for September is 78° with an average low of 54°. 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.
