S
M
T
W
T
F
S
29
59°
21°
30
55°
32°
31
46°
31°
1
37°
25°
2
33°
28°
3
35°
30°
4
36°
31°
5
46°
29°
6
38°
16°
7
40°
10°
8
51°
25°
9
51°
34°
10
47°
27°
11
59°
23°
12
63°
38°
13
66°
45°
14
60°
42°
15
63°
44°
16
73°
46°
17
65°
33°
18
44°
27°
19
38°
20°
20
50°
35°
21
65°
27°
22
61°
35°
23
64°
42°
24
60°
39°
25
51°
32°
26
50°
31°
27
51°
32°
28
53°
31°
29
55°
32°
30
56°
32°
1
60°
38°
2
55°
38°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
April Weather in Foster City
Foster City's April 2026 forecast shows daily high temperatures ranging from 38° to 65°, with overnight lows between 20° and 42°. The average high for April is 55° with an average low of 33°. 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 Foster City. See also: May | June | July.
