S
M
T
W
T
F
S
26
83°
60°
27
85°
56°
28
81°
59°
29
85°
55°
30
85°
54°
31
89°
57°
1
90°
56°
2
90°
62°
3
90°
58°
4
89°
60°
5
87°
57°
6
86°
55°
7
86°
58°
8
88°
53°
9
87°
55°
10
82°
59°
11
82°
55°
12
79°
53°
13
71°
53°
14
72°
49°
15
75°
48°
16
76°
50°
17
78°
54°
18
79°
56°
19
78°
54°
20
75°
52°
21
76°
53°
22
77°
52°
23
78°
53°
24
79°
52°
25
78°
49°
26
73°
51°
27
77°
52°
28
80°
52°
29
79°
53°
30
78°
52°
31
78°
52°
1
77°
51°
2
78°
51°
3
76°
49°
4
76°
51°
5
80°
52°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Flagstaff
Flagstaff's August 2026 forecast shows daily high temperatures ranging from 71° to 80°, with overnight lows between 48° and 56°. The average high for August is 77° with an average low of 52°. 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 Flagstaff. See also: September | October | November.
