S
M
T
W
T
F
S
26
81°
57°
27
81°
60°
28
82°
60°
29
80°
61°
30
80°
59°
31
81°
60°
1
84°
61°
2
88°
63°
3
83°
60°
4
80°
66°
5
79°
68°
6
80°
64°
7
83°
64°
8
80°
61°
9
Hist. Avg.
84°
62°
10
Hist. Avg.
84°
62°
11
Hist. Avg.
84°
62°
12
Hist. Avg.
84°
62°
13
Hist. Avg.
83°
62°
14
Hist. Avg.
83°
62°
15
Hist. Avg.
83°
62°
16
Hist. Avg.
83°
61°
17
Hist. Avg.
83°
61°
18
Hist. Avg.
83°
61°
19
Hist. Avg.
82°
61°
20
Hist. Avg.
82°
61°
21
Hist. Avg.
82°
60°
22
Hist. Avg.
82°
60°
23
Hist. Avg.
82°
60°
24
Hist. Avg.
82°
60°
25
Hist. Avg.
81°
60°
26
Hist. Avg.
81°
59°
27
Hist. Avg.
81°
59°
28
Hist. Avg.
81°
59°
29
Hist. Avg.
81°
58°
30
Hist. Avg.
80°
58°
31
Hist. Avg.
80°
58°
1
Hist. Avg.
80°
58°
2
Hist. Avg.
80°
57°
3
Hist. Avg.
80°
57°
4
Hist. Avg.
79°
56°
5
Hist. Avg.
79°
56°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
August Weather in Sioux Falls
Sioux Falls's August 2026 forecast shows daily high temperatures ranging from 79° to 88°, with overnight lows between 57° and 68°. The average high for August is 82° 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 Sioux Falls. See also: September | October | November.
