S
M
T
W
T
F
S
31
83°
63°
1
84°
64°
2
78°
63°
3
76°
64°
4
76°
63°
5
83°
63°
6
79°
63°
7
81°
62°
8
86°
65°
9
83°
61°
10
85°
60°
11
84°
60°
12
83°
60°
13
83°
61°
14
82°
59°
15
86°
59°
16
75°
55°
17
76°
55°
18
76°
56°
19
75°
59°
20
78°
64°
21
86°
65°
22
79°
64°
23
83°
65°
24
87°
66°
25
88°
66°
26
88°
65°
27
86°
67°
28
89°
68°
29
89°
67°
30
88°
66°
1
86°
67°
2
89°
68°
3
89°
67°
4
82°
62°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
June Weather in Fullerton
Fullerton's June 2026 forecast shows daily high temperatures ranging from 75° to 89°, with overnight lows between 55° and 68°. The average high for June is 83° with an average low of 63°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how June weather will actually feel in Fullerton. See also: July | August | September.
