S
M
T
W
T
F
S
26
90°
73°
27
91°
74°
28
87°
74°
29
87°
73°
30
88°
73°
1
90°
73°
2
91°
73°
3
91°
72°
4
92°
74°
5
92°
74°
6
93°
74°
7
91°
73°
8
90°
72°
9
90°
72°
10
90°
72°
11
91°
72°
12
90°
73°
13
90°
74°
14
92°
75°
15
91°
75°
16
89°
73°
17
92°
74°
18
90°
74°
19
91°
72°
20
90°
72°
21
90°
74°
22
89°
74°
23
88°
73°
24
87°
75°
25
88°
73°
26
86°
72°
27
87°
73°
28
89°
72°
29
86°
71°
30
86°
70°
31
86°
71°
1
87°
72°
2
88°
72°
3
87°
73°
4
85°
72°
5
86°
72°
6
86°
73°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in San José
San José's May 2026 forecast shows daily high temperatures ranging from 85° to 90°, with overnight lows between 70° and 75°. The average high for May is 87° with an average low of 72°. 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 José. See also: June | July | August.
