S
M
T
W
T
F
S
26
73°
51°
27
68°
49°
28
62°
46°
29
57°
40°
30
57°
35°
1
55°
32°
2
64°
33°
3
73°
51°
4
74°
48°
5
56°
41°
6
47°
33°
7
59°
30°
8
75°
36°
9
65°
42°
10
65°
38°
11
65°
36°
12
80°
48°
13
71°
49°
14
77°
43°
15
86°
57°
16
83°
57°
17
66°
53°
18
81°
56°
19
72°
51°
20
65°
48°
21
62°
49°
22
67°
48°
23
70°
53°
24
82°
44°
25
88°
63°
26
90°
66°
27
90°
61°
28
84°
60°
29
86°
60°
30
79°
56°
31
79°
57°
1
82°
54°
2
83°
52°
3
83°
61°
4
80°
63°
5
78°
57°
6
74°
56°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in St. Joseph
St. Joseph's May 2026 forecast shows daily high temperatures ranging from 74° to 86°, with overnight lows between 52° and 63°. The average high for May is 80° with an average low of 57°. 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 St. Joseph. See also: June | July | August.
