S
M
T
W
T
F
S
27
71°
64°
28
73°
64°
29
70°
64°
30
69°
64°
1
69°
47°
2
69°
43°
3
79°
48°
4
73°
44°
5
78°
43°
6
88°
50°
7
80°
48°
8
85°
43°
9
89°
51°
10
89°
59°
11
85°
58°
12
74°
51°
13
57°
44°
14
55°
38°
15
57°
46°
16
54°
30°
17
63°
28°
18
70°
40°
19
68°
35°
20
73°
40°
21
78°
44°
22
77°
44°
23
81°
59°
24
62°
45°
25
67°
53°
26
60°
41°
27
61°
47°
28
66°
46°
29
69°
55°
30
71°
54°
31
61°
42°
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 60° to 71°, with overnight lows between 41° and 55°. The average high for October is 65° with an average low of 48°. 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.
