S
M
T
W
T
F
S
26
46°
34°
27
54°
27°
28
62°
25°
29
65°
31°
30
66°
28°
1
63°
33°
2
66°
28°
3
69°
36°
4
58°
44°
5
52°
31°
6
65°
28°
7
70°
28°
8
79°
34°
9
79°
40°
10
78°
42°
11
81°
34°
12
84°
48°
13
77°
40°
14
77°
44°
15
76°
44°
16
73°
42°
17
69°
40°
18
70°
39°
19
74°
43°
20
76°
42°
21
76°
41°
22
72°
39°
23
70°
38°
24
71°
38°
25
72°
36°
26
72°
42°
27
67°
39°
28
72°
43°
29
71°
42°
30
75°
42°
31
68°
41°
1
73°
43°
2
77°
44°
3
78°
44°
4
79°
45°
5
78°
46°
6
79°
46°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Flagstaff
Flagstaff's May 2026 forecast shows daily high temperatures ranging from 67° to 84°, with overnight lows between 36° and 48°. The average high for May is 74° with an average low of 42°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how May weather will actually feel in Flagstaff. See also: June | July | August.
