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
102°
62°
2
87°
55°
3
85°
56°
4
91°
62°
5
97°
66°
6
99°
65°
7
100°
66°
8
95°
65°
9
96°
66°
10
98°
68°
11
96°
67°
12
95°
66°
13
94°
67°
14
92°
61°
15
96°
68°
16
86°
66°
17
92°
66°
18
94°
66°
19
94°
67°
20
93°
66°
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 55° and 68°. The average high for August is 92° 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.
