S
M
T
W
T
F
S
29
79°
39°
30
86°
36°
31
56°
41°
1
45°
34°
2
45°
36°
3
39°
35°
4
51°
30°
5
66°
27°
6
49°
37°
7
49°
31°
8
63°
34°
9
55°
34°
10
56°
26°
11
72°
46°
12
85°
54°
13
82°
47°
14
76°
44°
15
67°
43°
16
86°
39°
17
69°
32°
18
55°
23°
19
63°
32°
20
84°
33°
21
88°
42°
22
84°
55°
23
80°
50°
24
65°
33°
25
52°
42°
26
60°
51°
27
56°
40°
28
52°
35°
29
64°
40°
30
62°
37°
1
69°
40°
2
78°
44°
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 35° and 51°. The average high for April is 62° with an average low of 41°. 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.
