S
M
T
W
T
F
S
26
76°
57°
27
80°
51°
28
82°
54°
29
84°
60°
30
89°
64°
1
84°
58°
2
89°
64°
3
90°
70°
4
77°
58°
5
73°
57°
6
78°
52°
7
89°
59°
8
94°
63°
9
98°
70°
10
100°
69°
11
104°
70°
12
100°
73°
13
96°
71°
14
95°
67°
15
92°
65°
16
92°
68°
17
88°
64°
18
83°
62°
19
86°
60°
20
89°
61°
21
90°
64°
22
90°
65°
23
91°
66°
24
94°
65°
25
90°
68°
26
90°
64°
27
90°
63°
28
82°
61°
29
85°
56°
30
91°
62°
31
98°
66°
1
103°
68°
2
102°
64°
3
102°
73°
4
103°
72°
5
102°
73°
6
101°
76°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in San Luis
San Luis's May 2026 forecast shows daily high temperatures ranging from 85° to 103°, with overnight lows between 56° and 76°. The average high for May is 99° with an average low of 68°. 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 Luis. See also: June | July | August.
