S
M
T
W
T
F
S
26
94°
64°
27
94°
67°
28
100°
60°
29
93°
59°
30
90°
63°
31
95°
64°
1
96°
68°
2
98°
68°
3
97°
67°
4
94°
70°
5
99°
72°
6
98°
70°
7
100°
68°
8
99°
69°
9
96°
63°
10
87°
58°
11
87°
64°
12
87°
60°
13
87°
61°
14
Hist. Avg.
92°
62°
15
Hist. Avg.
91°
61°
16
Hist. Avg.
91°
61°
17
Hist. Avg.
91°
61°
18
Hist. Avg.
90°
60°
19
Hist. Avg.
90°
60°
20
Hist. Avg.
90°
60°
21
Hist. Avg.
89°
60°
22
Hist. Avg.
89°
60°
23
Hist. Avg.
89°
59°
24
Hist. Avg.
88°
59°
25
Hist. Avg.
88°
59°
26
Hist. Avg.
88°
58°
27
Hist. Avg.
87°
58°
28
Hist. Avg.
87°
58°
29
Hist. Avg.
87°
58°
30
Hist. Avg.
86°
57°
31
Hist. Avg.
86°
57°
1
Hist. Avg.
86°
57°
2
Hist. Avg.
85°
56°
3
Hist. Avg.
85°
56°
4
Hist. Avg.
85°
56°
5
Hist. Avg.
84°
56°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
August Weather in Boise
Boise's August 2026 forecast shows daily high temperatures ranging from 87° to 100°, with overnight lows between 58° and 72°. The average high for August is 94° with an average low of 65°. 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.
