S
M
T
W
T
F
S
26
64°
36°
27
72°
37°
28
74°
47°
29
70°
49°
30
56°
43°
1
53°
36°
2
46°
34°
3
49°
38°
4
57°
49°
5
69°
45°
6
50°
40°
7
53°
38°
8
47°
37°
9
52°
38°
10
53°
44°
11
55°
43°
12
55°
43°
13
57°
44°
14
57°
43°
15
60°
42°
16
68°
46°
17
67°
47°
18
68°
47°
19
66°
45°
20
67°
48°
21
70°
48°
22
68°
49°
23
63°
42°
24
61°
42°
25
61°
43°
26
62°
46°
27
64°
44°
28
62°
43°
29
62°
42°
30
64°
46°
31
65°
50°
1
65°
45°
2
66°
43°
3
68°
52°
4
69°
49°
5
66°
48°
6
74°
53°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Granby
Granby's May 2026 forecast shows daily high temperatures ranging from 46° to 74°, with overnight lows between 34° and 53°. The average high for May is 61° with an average low of 44°. 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 Granby. See also: June | July | August.
