S
M
T
W
T
F
S
30
88°
48°
31
85°
46°
1
74°
45°
2
72°
47°
3
74°
48°
4
81°
55°
5
83°
55°
6
79°
46°
7
75°
44°
8
71°
46°
9
70°
44°
10
71°
50°
11
74°
45°
12
70°
43°
13
70°
52°
14
77°
57°
15
82°
44°
16
70°
43°
17
68°
42°
18
69°
43°
19
76°
42°
20
74°
45°
21
74°
50°
22
77°
45°
23
67°
42°
24
65°
46°
25
70°
50°
26
75°
41°
27
66°
53°
28
68°
47°
29
69°
45°
30
63°
39°
1
62°
38°
2
60°
38°
3
62°
43°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Red Bluff
Red Bluff's September 2026 forecast shows daily high temperatures ranging from 60° to 88°, with overnight lows between 38° and 57°. The average high for September is 72° with an average low of 46°. 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 Red Bluff. See also: October | November | December.
