S
M
T
W
T
F
S
26
81°
65°
27
82°
65°
28
81°
64°
29
81°
65°
30
80°
64°
31
77°
60°
1
76°
58°
2
77°
62°
3
76°
63°
4
77°
63°
5
80°
64°
6
84°
65°
7
86°
66°
8
86°
65°
9
85°
64°
10
85°
64°
11
84°
65°
12
85°
64°
13
84°
65°
14
78°
60°
15
76°
54°
16
77°
55°
17
78°
54°
18
77°
52°
19
79°
51°
20
75°
51°
21
75°
55°
22
76°
51°
23
77°
54°
24
79°
54°
25
80°
55°
26
84°
60°
27
82°
59°
28
85°
51°
29
77°
50°
30
72°
50°
31
71°
51°
1
71°
48°
2
72°
54°
3
78°
54°
4
79°
56°
5
72°
54°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Sioux Falls Junction
Sioux Falls Junction's August 2026 forecast shows daily high temperatures ranging from 71° to 86°, with overnight lows between 48° and 66°. The average high for August is 79° with an average low of 58°. 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 Sioux Falls Junction. See also: September | October | November.
