S
M
T
W
T
F
S
26
86°
69°
27
86°
70°
28
74°
66°
29
76°
56°
30
81°
60°
31
83°
58°
1
75°
67°
2
75°
62°
3
79°
56°
4
86°
58°
5
84°
68°
6
79°
67°
7
85°
71°
8
76°
58°
9
81°
70°
10
80°
67°
11
79°
63°
12
79°
61°
13
77°
60°
14
76°
59°
15
75°
58°
16
74°
59°
17
76°
60°
18
76°
59°
19
80°
58°
20
79°
60°
21
83°
64°
22
83°
65°
23
82°
65°
24
81°
64°
25
81°
64°
26
82°
63°
27
80°
63°
28
75°
62°
29
78°
61°
30
79°
62°
31
81°
63°
1
82°
61°
2
76°
59°
3
76°
59°
4
77°
60°
5
81°
61°
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 74° to 85°, with overnight lows between 58° and 71°. The average high for August is 79° with an average low of 62°. 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.
