S
M
T
W
T
F
S
29
64°
28°
30
52°
30°
31
37°
28°
1
32°
27°
2
30°
27°
3
30°
28°
4
36°
28°
5
39°
25°
6
28°
10°
7
37°
9°
8
45°
32°
9
37°
25°
10
55°
38°
11
53°
46°
12
68°
42°
13
57°
38°
14
57°
39°
15
68°
39°
16
62°
34°
17
55°
33°
18
62°
40°
19
60°
37°
20
57°
35°
21
60°
36°
22
56°
34°
23
52°
39°
24
51°
39°
25
52°
34°
26
53°
39°
27
55°
42°
28
54°
43°
29
56°
43°
30
55°
40°
1
54°
40°
2
54°
38°
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 37° to 68°, with overnight lows between 25° and 46°. The average high for April is 56° with an average low of 38°. 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.
