S
M
T
W
T
F
S
30
95°
71°
31
94°
72°
1
95°
72°
2
96°
71°
3
95°
72°
4
95°
72°
5
94°
71°
6
95°
69°
7
96°
63°
8
86°
64°
9
86°
68°
10
91°
68°
11
92°
67°
12
93°
66°
13
89°
67°
14
92°
68°
15
91°
60°
16
92°
58°
17
84°
59°
18
82°
61°
19
82°
56°
20
84°
56°
21
81°
57°
22
80°
55°
23
81°
56°
24
82°
57°
25
82°
60°
26
83°
61°
27
87°
63°
28
87°
64°
29
88°
59°
30
86°
61°
1
80°
59°
2
86°
53°
3
79°
58°
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 79° to 96°, with overnight lows between 53° and 72°. The average high for September is 88° with an average low of 63°. 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.
