S
M
T
W
T
F
S
26
85°
68°
27
87°
69°
28
88°
70°
29
88°
70°
30
87°
69°
31
86°
70°
1
87°
70°
2
88°
71°
3
88°
70°
4
87°
69°
5
87°
69°
6
88°
70°
7
89°
68°
8
86°
65°
9
82°
65°
10
81°
67°
11
87°
70°
12
88°
70°
13
89°
71°
14
88°
69°
15
87°
67°
16
82°
65°
17
84°
63°
18
81°
64°
19
85°
67°
20
87°
66°
21
88°
67°
22
86°
66°
23
83°
61°
24
80°
60°
25
79°
59°
26
79°
59°
27
80°
58°
28
80°
59°
29
81°
59°
30
83°
65°
31
84°
65°
1
82°
64°
2
85°
64°
3
86°
56°
4
81°
56°
5
78°
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 78° to 89°, with overnight lows between 56° and 71°. The average high for August is 85° 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.
