S
M
T
W
T
F
S
29
84°
56°
30
74°
57°
31
72°
63°
1
73°
60°
2
71°
59°
3
87°
54°
4
91°
52°
5
84°
54°
6
79°
61°
7
76°
58°
8
81°
57°
9
79°
58°
10
74°
58°
11
72°
53°
12
68°
53°
13
70°
53°
14
74°
57°
15
75°
58°
16
74°
57°
17
72°
57°
18
73°
59°
19
73°
58°
20
74°
59°
21
75°
54°
22
69°
53°
23
70°
51°
24
70°
51°
25
71°
52°
26
69°
53°
27
68°
51°
28
69°
51°
29
69°
52°
30
70°
51°
1
70°
52°
2
74°
55°
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 68° to 81°, with overnight lows between 51° and 59°. The average high for April is 72° with an average low of 55°. 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.
