S
M
T
W
T
F
S
26
46°
28°
27
44°
38°
28
41°
26°
29
40°
22°
30
43°
31°
1
47°
34°
2
39°
29°
3
43°
28°
4
42°
23°
5
45°
31°
6
48°
33°
7
49°
26°
8
50°
27°
9
48°
26°
10
47°
28°
11
52°
27°
12
46°
26°
13
47°
27°
14
48°
31°
15
47°
29°
16
47°
27°
17
48°
25°
18
48°
25°
19
49°
26°
20
50°
28°
21
50°
28°
22
51°
27°
23
51°
27°
24
50°
30°
25
51°
29°
26
52°
28°
27
51°
28°
28
52°
29°
29
52°
29°
30
53°
30°
31
52°
29°
1
53°
30°
2
54°
30°
3
55°
30°
4
55°
31°
5
56°
32°
6
59°
37°
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 39° to 59°, with overnight lows between 22° and 37°. The average high for May is 49° with an average low of 28°. 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.
