S
M
T
W
T
F
S
26
92°
73°
27
92°
72°
28
93°
73°
29
91°
71°
30
92°
72°
31
91°
71°
1
89°
67°
2
89°
68°
3
82°
69°
4
84°
69°
5
86°
71°
6
90°
72°
7
92°
72°
8
92°
71°
9
90°
71°
10
90°
70°
11
89°
70°
12
90°
69°
13
90°
71°
14
92°
70°
15
91°
69°
16
90°
66°
17
88°
65°
18
87°
61°
19
82°
59°
20
82°
58°
21
81°
59°
22
81°
59°
23
87°
58°
24
83°
66°
25
88°
65°
26
90°
66°
27
90°
67°
28
91°
67°
29
91°
63°
30
89°
60°
31
83°
63°
1
87°
57°
2
80°
55°
3
79°
60°
4
86°
63°
5
87°
63°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in St. Joseph
St. Joseph's August 2026 forecast shows daily high temperatures ranging from 79° to 93°, with overnight lows between 55° and 73°. The average high for August is 88° with an average low of 66°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how August weather will actually feel in St. Joseph. See also: September | October | November.
