S
M
T
W
T
F
S
27
65°
57°
28
67°
59°
29
71°
60°
30
74°
57°
1
80°
59°
2
84°
58°
3
74°
52°
4
62°
54°
5
70°
44°
6
63°
40°
7
67°
46°
8
72°
47°
9
73°
48°
10
70°
48°
11
73°
51°
12
69°
56°
13
68°
47°
14
65°
45°
15
66°
49°
16
68°
42°
17
69°
49°
18
68°
49°
19
59°
40°
20
59°
37°
21
57°
39°
22
56°
46°
23
58°
44°
24
60°
44°
25
59°
42°
26
56°
40°
27
55°
37°
28
54°
36°
29
55°
39°
30
63°
42°
31
64°
44°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
October Weather in Fullerton
Fullerton's October 2026 forecast shows daily high temperatures ranging from 54° to 74°, with overnight lows between 36° and 56°. The average high for October is 64° with an average low of 45°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how October weather will actually feel in Fullerton. See also: November | December | January.
