S
M
T
W
T
F
S
26
54°
37°
27
52°
37°
28
63°
37°
29
59°
36°
30
48°
39°
1
63°
32°
2
72°
39°
3
75°
54°
4
73°
45°
5
46°
32°
6
41°
32°
7
72°
43°
8
70°
41°
9
77°
48°
10
68°
46°
11
88°
48°
12
77°
57°
13
88°
50°
14
88°
63°
15
82°
55°
16
79°
59°
17
64°
43°
18
43°
37°
19
46°
36°
20
55°
43°
21
66°
41°
22
64°
43°
23
77°
41°
24
81°
55°
25
82°
52°
26
79°
55°
27
70°
54°
28
75°
52°
29
79°
57°
30
77°
52°
31
81°
52°
1
79°
55°
2
77°
52°
3
81°
54°
4
90°
52°
5
88°
59°
6
95°
57°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Boulder
Boulder's May 2026 forecast shows daily high temperatures ranging from ° to °, with overnight lows between ° and °. The average high for May is ° with an average low of °. 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 Boulder. See also: June | July | August.
