S
M
T
W
T
F
S
26
81°
54°
27
84°
63°
28
61°
55°
29
64°
46°
30
66°
39°
1
64°
43°
2
63°
41°
3
81°
39°
4
84°
54°
5
70°
46°
6
63°
41°
7
68°
49°
8
76°
51°
9
80°
56°
10
64°
42°
11
74°
49°
12
73°
50°
13
70°
47°
14
76°
54°
15
75°
55°
16
78°
57°
17
79°
58°
18
81°
59°
19
82°
60°
20
77°
52°
21
70°
50°
22
70°
51°
23
71°
52°
24
73°
56°
25
73°
56°
26
74°
54°
27
73°
55°
28
75°
52°
29
74°
52°
30
78°
57°
31
78°
56°
1
80°
60°
2
81°
60°
3
82°
61°
4
83°
62°
5
83°
62°
6
82°
63°
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 64° to 83°, with overnight lows between 42° and 63°. The average high for May is 76° 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 Sullivan. See also: June | July | August.
