S
M
T
W
T
F
S
26
84°
60°
27
84°
60°
28
85°
61°
29
85°
62°
30
84°
60°
31
77°
57°
1
77°
55°
2
81°
58°
3
84°
60°
4
84°
60°
5
85°
61°
6
84°
62°
7
82°
58°
8
86°
55°
9
77°
55°
10
83°
58°
11
85°
62°
12
84°
61°
13
79°
61°
14
79°
55°
15
80°
55°
16
81°
54°
17
77°
55°
18
78°
56°
19
78°
53°
20
76°
55°
21
76°
56°
22
77°
59°
23
77°
60°
24
76°
58°
25
74°
54°
26
75°
59°
27
78°
61°
28
84°
54°
29
81°
55°
30
82°
56°
31
83°
61°
1
82°
60°
2
83°
61°
3
83°
55°
4
81°
56°
5
80°
63°
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 74° to 86°, with overnight lows between 53° and 63°. The average high for August is 81° with an average low of 58°. 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.
