S
M
T
W
T
F
S
26
63°
36°
27
73°
38°
28
68°
55°
29
62°
48°
30
53°
39°
1
57°
35°
2
49°
36°
3
57°
36°
4
74°
47°
5
74°
48°
6
49°
44°
7
57°
37°
8
56°
38°
9
63°
37°
10
59°
40°
11
55°
34°
12
60°
33°
13
69°
45°
14
51°
44°
15
64°
44°
16
80°
42°
17
78°
60°
18
90°
71°
19
88°
65°
20
70°
41°
21
59°
42°
22
64°
49°
23
60°
51°
24
65°
52°
25
69°
51°
26
68°
53°
27
70°
50°
28
74°
52°
29
73°
53°
30
75°
50°
31
73°
53°
1
69°
50°
2
69°
54°
3
68°
55°
4
71°
55°
5
69°
54°
6
71°
55°
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 59° to 90°, with overnight lows between 41° and 71°. The average high for May is 71° with an average low of 53°. 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.
