S
M
T
W
T
F
S
26
92°
63°
27
94°
62°
28
96°
63°
29
94°
62°
30
97°
67°
31
102°
66°
1
101°
72°
2
85°
61°
3
82°
54°
4
88°
54°
5
96°
60°
6
100°
65°
7
100°
68°
8
100°
68°
9
97°
62°
10
96°
61°
11
97°
62°
12
93°
62°
13
85°
62°
14
89°
65°
15
92°
69°
16
92°
65°
17
93°
69°
18
97°
66°
19
98°
63°
20
100°
65°
21
101°
70°
22
97°
76°
23
90°
62°
24
94°
67°
25
97°
71°
26
97°
68°
27
93°
64°
28
87°
63°
29
86°
59°
30
83°
57°
31
83°
59°
1
85°
58°
2
83°
58°
3
84°
59°
4
87°
60°
5
84°
56°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Boise
Boise's August 2026 forecast shows daily high temperatures ranging from 83° to 97°, with overnight lows between 56° and 71°. The average high for August is 88° 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 Boise. See also: September | October | November.
