S
M
T
W
T
F
S
30
88°
54°
31
86°
45°
1
76°
44°
2
76°
44°
3
82°
48°
4
85°
48°
5
85°
44°
6
75°
42°
7
72°
43°
8
72°
47°
9
70°
47°
10
71°
50°
11
71°
40°
12
70°
44°
13
70°
50°
14
71°
45°
15
70°
43°
16
68°
40°
17
69°
40°
18
70°
43°
19
75°
39°
20
71°
42°
21
71°
38°
22
68°
36°
23
66°
39°
24
66°
44°
25
67°
38°
26
65°
37°
27
65°
39°
28
66°
40°
29
65°
43°
30
67°
39°
1
65°
36°
2
68°
40°
3
70°
42°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Oroville
Oroville's September 2026 forecast shows daily high temperatures ranging from 65° to 88°, with overnight lows between 36° and 54°. The average high for September is 72° with an average low of 43°. 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 Oroville. See also: October | November | December.
