S
M
T
W
T
F
S
26
75°
39°
27
70°
37°
28
75°
35°
29
76°
35°
30
74°
50°
1
57°
42°
2
64°
41°
3
71°
39°
4
75°
50°
5
62°
43°
6
67°
36°
7
73°
36°
8
82°
42°
9
86°
46°
10
81°
53°
11
82°
46°
12
90°
47°
13
87°
50°
14
86°
55°
15
85°
53°
16
85°
53°
17
82°
48°
18
81°
48°
19
81°
43°
20
79°
51°
21
81°
46°
22
82°
45°
23
77°
44°
24
80°
48°
25
70°
47°
26
66°
43°
27
76°
45°
28
84°
48°
29
83°
47°
30
87°
48°
31
84°
49°
1
81°
48°
2
84°
50°
3
81°
48°
4
86°
49°
5
85°
47°
6
79°
50°
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 66° to 87°, with overnight lows between 43° and 50°. The average high for May is 80° with an average low of 47°. 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.
