S
M
T
W
T
F
S
26
96°
75°
27
95°
78°
28
94°
76°
29
94°
77°
30
94°
75°
1
100°
76°
2
99°
76°
3
101°
78°
4
95°
78°
5
93°
75°
6
98°
78°
7
96°
76°
8
96°
78°
9
92°
77°
10
96°
78°
11
98°
78°
12
95°
76°
13
94°
79°
14
93°
78°
15
96°
77°
16
94°
78°
17
96°
78°
18
95°
77°
19
94°
78°
20
89°
78°
21
96°
79°
22
98°
78°
23
98°
79°
24
98°
79°
25
96°
77°
26
94°
79°
27
93°
77°
28
94°
79°
29
93°
79°
30
N/A
31
94°
80°
1
90°
79°
2
89°
78°
3
89°
79°
4
90°
79°
5
92°
78°
6
92°
80°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
May Weather in San Isidro
San Isidro's May 2026 forecast shows daily high temperatures ranging from 89° to 94°, with overnight lows between 78° and 80°. The average high for May is 91° with an average low of 79°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how May weather will actually feel in San Isidro. See also: June | July | August.
