S
M
T
W
T
F
S
30
91°
63°
31
82°
63°
1
73°
57°
2
75°
63°
3
68°
63°
4
75°
55°
5
81°
55°
6
82°
59°
7
90°
54°
8
95°
57°
9
102°
63°
10
97°
73°
11
91°
68°
12
90°
66°
13
81°
57°
14
90°
59°
15
86°
61°
16
81°
56°
17
78°
55°
18
92°
59°
19
91°
60°
20
86°
59°
21
93°
58°
22
95°
61°
23
96°
60°
24
94°
61°
25
91°
61°
26
85°
58°
27
85°
56°
28
88°
57°
29
87°
52°
30
85°
52°
1
89°
56°
2
86°
56°
3
89°
55°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Chico
Chico's September 2026 forecast shows daily high temperatures ranging from 78° to 96°, with overnight lows between 52° and 61°. The average high for September is 88° with an average low of 57°. 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 Chico. See also: October | November | December.
