S
M
T
W
T
F
S
26
82°
57°
27
87°
67°
28
73°
58°
29
70°
54°
30
65°
46°
1
69°
46°
2
69°
40°
3
80°
37°
4
82°
61°
5
75°
47°
6
61°
45°
7
66°
44°
8
76°
51°
9
81°
56°
10
76°
51°
11
76°
54°
12
81°
53°
13
79°
57°
14
84°
54°
15
83°
56°
16
87°
61°
17
78°
53°
18
74°
58°
19
80°
58°
20
78°
56°
21
81°
51°
22
73°
50°
23
74°
52°
24
73°
54°
25
71°
52°
26
73°
51°
27
75°
52°
28
76°
53°
29
76°
57°
30
78°
60°
31
77°
61°
1
77°
59°
2
78°
56°
3
78°
62°
4
77°
62°
5
77°
63°
6
78°
63°
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 61° to 87°, with overnight lows between 44° and 63°. The average high for May is 77° with an average low of 55°. 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.
