S
M
T
W
T
F
S
26
89°
70°
27
86°
69°
28
87°
66°
29
80°
63°
30
80°
66°
31
81°
65°
1
83°
69°
2
88°
70°
3
87°
69°
4
87°
68°
5
85°
67°
6
86°
69°
7
87°
70°
8
87°
70°
9
88°
68°
10
80°
64°
11
82°
66°
12
84°
68°
13
84°
68°
14
80°
61°
15
79°
60°
16
79°
61°
17
80°
62°
18
81°
66°
19
83°
65°
20
85°
67°
21
84°
65°
22
80°
62°
23
84°
66°
24
83°
60°
25
84°
61°
26
85°
65°
27
87°
66°
28
82°
62°
29
80°
58°
30
78°
62°
31
79°
64°
1
79°
65°
2
80°
58°
3
79°
55°
4
77°
56°
5
75°
56°
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 75° to 89°, with overnight lows between 55° and 70°. The average high for August is 83° with an average low of 64°. 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.
