S
M
T
W
T
F
S
29
85°
56°
30
74°
57°
31
65°
57°
1
59°
56°
2
64°
46°
3
74°
47°
4
75°
51°
5
81°
55°
6
64°
51°
7
66°
51°
8
74°
53°
9
70°
54°
10
63°
55°
11
60°
54°
12
58°
49°
13
62°
46°
14
63°
49°
15
62°
47°
16
71°
46°
17
72°
48°
18
71°
49°
19
70°
53°
20
63°
51°
21
60°
52°
22
57°
50°
23
71°
49°
24
67°
51°
25
62°
53°
26
66°
48°
27
68°
48°
28
74°
49°
29
75°
46°
30
75°
46°
1
78°
45°
2
75°
46°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
April Weather in Port Costa
Port Costa's April 2026 forecast shows daily high temperatures ranging from 62° to 78°, with overnight lows between 45° and 53°. The average high for April is 71° with an average low of 48°. 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 Port Costa. See also: May | June | July.
