S
M
T
W
T
F
S
29
70°
56°
30
69°
58°
31
69°
64°
1
68°
60°
2
68°
60°
3
70°
56°
4
79°
53°
5
72°
56°
6
73°
61°
7
70°
58°
8
71°
59°
9
70°
61°
10
69°
58°
11
70°
59°
12
67°
57°
13
67°
57°
14
69°
56°
15
66°
59°
16
65°
58°
17
66°
60°
18
67°
59°
19
65°
59°
20
64°
58°
21
67°
59°
22
70°
58°
23
66°
56°
24
62°
53°
25
63°
52°
26
62°
54°
27
61°
52°
28
61°
53°
29
62°
52°
30
62°
53°
1
63°
53°
2
66°
56°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
April Weather in Costa Mesa
Costa Mesa's April 2026 forecast shows daily high temperatures ranging from 61° to 70°, with overnight lows between 52° and 60°. The average high for April is 65° with an average low of 56°. 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 Costa Mesa. See also: May | June | July.
