S
M
T
W
T
F
S
30
98°
61°
31
100°
67°
1
101°
70°
2
99°
70°
3
98°
70°
4
101°
71°
5
103°
72°
6
105°
73°
7
102°
73°
8
104°
69°
9
100°
71°
10
100°
70°
11
96°
72°
12
101°
69°
13
99°
68°
14
102°
72°
15
100°
74°
16
100°
72°
17
98°
68°
18
98°
67°
19
99°
71°
20
98°
67°
21
96°
67°
22
92°
64°
23
91°
65°
24
87°
62°
25
84°
62°
26
82°
62°
27
83°
60°
28
82°
56°
29
86°
63°
30
85°
62°
1
86°
63°
2
86°
62°
3
85°
62°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Sycamore
Sycamore's September 2026 forecast shows daily high temperatures ranging from 82° to 100°, with overnight lows between 56° and 74°. The average high for September is 90° with an average low of 65°. 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 Sycamore. See also: October | November | December.
