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°
66°
24
91°
61°
25
98°
70°
26
99°
72°
27
98°
70°
28
87°
67°
29
86°
64°
30
77°
50°
31
88°
55°
1
86°
64°
2
78°
60°
3
77°
46°
4
58°
46°
5
76°
54°
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 76° to 76°, with overnight lows between 54° and 54°. The average high for August is 76° with an average low of 54°. 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.
