S
M
T
W
T
F
S
26
96°
72°
27
97°
75°
28
93°
73°
29
92°
72°
30
81°
73°
31
74°
62°
1
86°
61°
2
88°
58°
3
90°
67°
4
73°
55°
5
81°
49°
6
85°
58°
7
82°
58°
8
84°
51°
9
87°
67°
10
87°
66°
11
90°
72°
12
90°
70°
13
82°
68°
14
78°
67°
15
82°
67°
16
81°
62°
17
86°
57°
18
84°
63°
19
79°
58°
20
86°
61°
21
86°
58°
22
84°
58°
23
82°
54°
24
82°
66°
25
91°
66°
26
83°
60°
27
85°
55°
28
87°
60°
29
92°
68°
30
98°
70°
31
93°
67°
1
90°
64°
2
92°
63°
3
94°
73°
4
99°
66°
5
92°
69°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Sioux Falls
Sioux Falls's August 2026 forecast shows daily high temperatures ranging from ° to °, with overnight lows between ° and °. The average high for August is ° with an average low of °. 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. See also: September | October | November.
