S
M
T
W
T
F
S
30
91°
63°
31
82°
63°
1
73°
57°
2
76°
60°
3
69°
58°
4
77°
54°
5
82°
58°
6
81°
56°
7
86°
57°
8
89°
60°
9
89°
61°
10
90°
60°
11
92°
62°
12
89°
59°
13
88°
61°
14
92°
62°
15
91°
55°
16
91°
59°
17
92°
58°
18
86°
57°
19
89°
58°
20
92°
57°
21
93°
58°
22
93°
58°
23
88°
57°
24
88°
56°
25
90°
57°
26
92°
58°
27
93°
58°
28
93°
57°
29
92°
58°
30
91°
57°
1
92°
58°
2
91°
57°
3
87°
56°
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 69° to 93°, with overnight lows between 54° and 62°. The average high for September is 88° with an average low of 58°. 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.
