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
68°
62°
11
69°
59°
12
68°
59°
13
65°
56°
14
69°
55°
15
69°
56°
16
69°
57°
17
75°
56°
18
77°
60°
19
72°
58°
20
70°
59°
21
68°
61°
22
63°
59°
23
64°
59°
24
67°
60°
25
66°
59°
26
65°
61°
27
67°
61°
28
66°
60°
29
68°
59°
30
67°
56°
1
69°
57°
2
70°
60°
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 63° to 77°, with overnight lows between 56° and 61°. The average high for April is 68° with an average low of 59°. 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.
