S
M
T
W
T
F
S
26
97°
74°
27
95°
77°
28
91°
73°
29
92°
70°
30
79°
74°
31
78°
62°
1
85°
60°
2
87°
60°
3
90°
67°
4
71°
57°
5
77°
51°
6
82°
53°
7
80°
57°
8
83°
52°
9
84°
65°
10
87°
68°
11
91°
74°
12
89°
68°
13
80°
68°
14
82°
68°
15
82°
69°
16
N/A
17
84°
66°
18
80°
63°
19
77°
61°
20
81°
62°
21
85°
60°
22
82°
63°
23
79°
60°
24
77°
64°
25
84°
65°
26
82°
64°
27
81°
60°
28
79°
62°
29
78°
61°
30
82°
53°
31
77°
62°
1
75°
59°
2
75°
56°
3
74°
53°
4
75°
58°
5
79°
59°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
August Weather in Yankton
Yankton's August 2026 forecast shows daily high temperatures ranging from 74° to 85°, with overnight lows between 53° and 66°. The average high for August is 79° with an average low of 61°. 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 Yankton. See also: September | October | November.
