S
M
T
W
T
F
S
30
82°
63°
31
82°
55°
1
81°
55°
2
76°
54°
3
75°
59°
4
78°
63°
5
83°
54°
6
82°
53°
7
74°
52°
8
75°
60°
9
77°
60°
10
77°
58°
11
74°
58°
12
72°
56°
13
73°
50°
14
71°
49°
15
71°
51°
16
72°
55°
17
71°
57°
18
78°
58°
19
79°
57°
20
78°
56°
21
77°
53°
22
73°
54°
23
70°
48°
24
69°
47°
25
67°
47°
26
69°
46°
27
68°
46°
28
Hist. Avg.
71°
48°
29
Hist. Avg.
70°
48°
30
Hist. Avg.
70°
48°
1
Hist. Avg.
69°
47°
2
Hist. Avg.
69°
47°
3
Hist. Avg.
68°
46°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Rockford
Rockford's September 2026 forecast shows daily high temperatures ranging from 67° to 83°, with overnight lows between 46° and 63°. The average high for September is 75° 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 Rockford. See also: October | November | December.
