S
M
T
W
T
F
S
26
78°
44°
27
65°
58°
28
62°
53°
29
61°
44°
30
62°
38°
1
58°
43°
2
58°
40°
3
68°
40°
4
76°
54°
5
59°
47°
6
59°
41°
7
65°
37°
8
66°
49°
9
76°
49°
10
68°
47°
11
71°
42°
12
80°
45°
13
70°
46°
14
70°
41°
15
77°
51°
16
74°
66°
17
82°
66°
18
75°
61°
19
77°
59°
20
69°
48°
21
69°
46°
22
69°
54°
23
75°
58°
24
78°
57°
25
82°
52°
26
82°
57°
27
84°
64°
28
86°
61°
29
83°
56°
30
83°
56°
31
78°
59°
1
83°
57°
2
81°
55°
3
81°
57°
4
82°
64°
5
84°
66°
6
84°
64°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Sullivan
Sullivan's May 2026 forecast shows daily high temperatures ranging from 78° to 84°, with overnight lows between 55° and 66°. The average high for May is 82° with an average low of 60°. 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 Sullivan. See also: June | July | August.
