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
102°
66°
9
98°
62°
10
97°
62°
11
97°
64°
12
93°
63°
13
91°
64°
14
91°
65°
15
91°
67°
16
93°
66°
17
92°
65°
18
92°
67°
19
93°
66°
20
94°
69°
21
90°
60°
22
92°
65°
23
92°
64°
24
93°
64°
25
93°
65°
26
92°
66°
27
92°
65°
28
91°
64°
29
88°
63°
30
83°
61°
31
87°
62°
1
88°
63°
2
83°
60°
3
79°
58°
4
84°
60°
5
85°
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 58° and 69°. 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.
