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
99°
65°
8
102°
66°
9
99°
64°
10
97°
62°
11
97°
64°
12
93°
65°
13
91°
64°
14
91°
65°
15
94°
67°
16
93°
67°
17
92°
65°
18
88°
64°
19
91°
66°
20
90°
60°
21
90°
64°
22
92°
65°
23
92°
64°
24
90°
63°
25
86°
62°
26
92°
64°
27
93°
65°
28
93°
64°
29
91°
65°
30
90°
64°
31
90°
63°
1
86°
60°
2
79°
56°
3
81°
60°
4
89°
62°
5
89°
61°
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 79° to 102°, with overnight lows between 56° and 67°. The average high for August is 91° with an average low of 64°. 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.
