S
M
T
W
T
F
S
29
72°
54°
30
76°
54°
31
79°
54°
1
83°
54°
2
83°
57°
3
73°
62°
4
64°
58°
5
70°
56°
6
71°
53°
7
85°
53°
8
85°
62°
9
88°
60°
10
89°
63°
11
83°
55°
12
71°
51°
13
73°
52°
14
74°
53°
15
74°
52°
16
79°
53°
17
80°
56°
18
81°
47°
19
67°
43°
20
N/A
21
67°
46°
22
68°
42°
23
69°
39°
24
72°
40°
25
72°
43°
26
71°
44°
27
71°
47°
28
72°
47°
29
71°
48°
30
69°
43°
1
67°
44°
2
68°
45°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
April Weather in Fullerton
Fullerton's April 2026 forecast shows daily high temperatures ranging from 67° to 72°, with overnight lows between 39° and 48°. The average high for April is 70° with an average low of 44°. 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.
