S
M
T
W
T
F
S
26
51°
35°
27
45°
39°
28
48°
30°
29
49°
33°
30
47°
28°
1
55°
33°
2
66°
42°
3
66°
42°
4
63°
35°
5
59°
33°
6
61°
37°
7
56°
32°
8
60°
36°
9
60°
34°
10
58°
38°
11
66°
40°
12
59°
37°
13
60°
36°
14
60°
37°
15
68°
45°
16
72°
48°
17
74°
49°
18
74°
47°
19
70°
46°
20
71°
50°
21
72°
50°
22
74°
52°
23
74°
52°
24
75°
51°
25
71°
49°
26
75°
52°
27
77°
54°
28
78°
54°
29
77°
53°
30
74°
55°
31
78°
56°
1
79°
57°
2
79°
55°
3
75°
54°
4
73°
54°
5
73°
55°
6
69°
56°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Summit
Summit's May 2026 forecast shows daily high temperatures ranging from 47° to 79°, with overnight lows between 28° and 57°. The average high for May is 67° with an average low of 45°. 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 Summit. See also: June | July | August.
