S
M
T
W
T
F
S
29
57°
23°
30
71°
36°
31
80°
55°
1
77°
50°
2
50°
40°
3
61°
40°
4
79°
43°
5
56°
42°
6
54°
38°
7
50°
29°
8
52°
24°
9
60°
27°
10
72°
41°
11
63°
42°
12
65°
34°
13
80°
50°
14
84°
55°
15
86°
59°
16
89°
61°
17
79°
59°
18
75°
52°
19
53°
35°
20
50°
29°
21
55°
24°
22
59°
44°
23
78°
47°
24
70°
47°
25
52°
42°
26
59°
39°
27
68°
45°
28
60°
48°
29
66°
50°
30
65°
47°
1
64°
46°
2
60°
42°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
April Weather in Fullerton
Fullerton's April 2026 forecast shows daily high temperatures ranging from 52° to 78°, with overnight lows between 39° and 50°. The average high for April 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 April weather will actually feel in Fullerton. See also: May | June | July.
