S
M
T
W
T
F
S
26
97°
61°
27
94°
63°
28
98°
61°
29
98°
64°
30
99°
69°
31
102°
70°
1
101°
66°
2
97°
67°
3
96°
66°
4
94°
65°
5
97°
65°
6
96°
68°
7
93°
63°
8
98°
69°
9
97°
68°
10
96°
67°
11
96°
66°
12
92°
66°
13
94°
67°
14
95°
67°
15
92°
66°
16
94°
66°
17
94°
65°
18
92°
65°
19
94°
66°
20
95°
66°
21
95°
67°
22
92°
65°
23
93°
66°
24
92°
64°
25
85°
63°
26
81°
58°
27
82°
63°
28
84°
63°
29
84°
61°
30
80°
58°
31
83°
61°
1
86°
61°
2
83°
57°
3
82°
58°
4
84°
59°
5
85°
60°
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 80° to 102°, with overnight lows between 57° and 70°. 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.
