S
M
T
W
T
F
S
30
80°
54°
31
81°
55°
1
83°
55°
2
88°
54°
3
87°
47°
4
80°
45°
5
77°
47°
6
78°
53°
7
84°
53°
8
86°
52°
9
82°
52°
10
85°
51°
11
85°
51°
12
84°
50°
13
80°
47°
14
79°
46°
15
80°
47°
16
82°
49°
17
81°
47°
18
83°
48°
19
82°
38°
20
72°
38°
21
Hist. Avg.
77°
44°
22
Hist. Avg.
76°
43°
23
Hist. Avg.
76°
43°
24
Hist. Avg.
75°
42°
25
Hist. Avg.
75°
42°
26
Hist. Avg.
74°
41°
27
Hist. Avg.
74°
41°
28
Hist. Avg.
73°
40°
29
Hist. Avg.
73°
40°
30
Hist. Avg.
72°
40°
1
Hist. Avg.
72°
39°
2
Hist. Avg.
71°
39°
3
Hist. Avg.
70°
38°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Sidney
Sidney's September 2026 forecast shows daily high temperatures ranging from 72° to 88°, with overnight lows between 38° and 55°. The average high for September is 82° with an average low of 49°. 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.
