S
M
T
W
T
F
S
29
77°
32°
30
76°
34°
31
69°
51°
1
58°
47°
2
67°
36°
3
61°
28°
4
64°
20°
5
67°
23°
6
67°
40°
7
69°
36°
8
76°
27°
9
76°
30°
10
72°
40°
11
71°
38°
12
72°
44°
13
63°
38°
14
64°
30°
15
66°
35°
16
72°
39°
17
66°
30°
18
59°
27°
19
70°
35°
20
76°
41°
21
77°
37°
22
78°
38°
23
76°
36°
24
74°
37°
25
71°
36°
26
66°
37°
27
71°
38°
28
74°
42°
29
75°
43°
30
71°
42°
1
75°
43°
2
67°
39°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
April Weather in San Mateo
San Mateo's April 2026 forecast shows daily high temperatures ranging from 59° to 78°, with overnight lows between 27° and 44°. The average high for April is 71° with an average low of 37°. 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 San Mateo. See also: May | June | July.
