S
M
T
W
T
F
S
30
96°
60°
31
95°
59°
1
94°
60°
2
94°
61°
3
95°
60°
4
95°
58°
5
93°
53°
6
90°
52°
7
86°
57°
8
87°
58°
9
92°
58°
10
93°
59°
11
94°
57°
12
90°
57°
13
92°
56°
14
92°
55°
15
88°
54°
16
85°
53°
17
89°
55°
18
92°
57°
19
93°
57°
20
92°
56°
21
91°
56°
22
85°
53°
23
82°
50°
24
86°
52°
25
84°
49°
26
84°
48°
27
83°
48°
28
81°
47°
29
82°
46°
30
81°
49°
1
80°
56°
2
86°
55°
3
87°
54°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Colusa
Colusa's September 2026 forecast shows daily high temperatures ranging from 80° to 96°, with overnight lows between 46° and 61°. The average high for September is 89° with an average low of 55°. 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 Colusa. See also: October | November | December.
