S
M
T
W
T
F
S
26
46°
34°
27
56°
28°
28
64°
34°
29
65°
33°
30
58°
37°
1
60°
31°
2
65°
38°
3
66°
39°
4
59°
34°
5
55°
33°
6
62°
37°
7
68°
39°
8
68°
38°
9
65°
38°
10
66°
33°
11
70°
40°
12
71°
40°
13
71°
39°
14
70°
40°
15
72°
41°
16
72°
41°
17
71°
42°
18
73°
42°
19
72°
41°
20
70°
41°
21
71°
40°
22
64°
40°
23
67°
41°
24
74°
42°
25
74°
42°
26
75°
43°
27
75°
43°
28
74°
42°
29
73°
43°
30
76°
43°
31
75°
42°
1
75°
43°
2
77°
44°
3
78°
44°
4
76°
43°
5
73°
43°
6
73°
44°
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 55° to 78°, with overnight lows between 28° and 44°. The average high for May is 69° with an average low of 40°. 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.
