S
M
T
W
T
F
S
26
75°
51°
27
72°
49°
28
72°
50°
29
70°
45°
30
66°
50°
1
67°
50°
2
69°
49°
3
68°
45°
4
71°
48°
5
75°
50°
6
76°
52°
7
77°
53°
8
77°
54°
9
76°
54°
10
76°
51°
11
69°
53°
12
70°
52°
13
75°
54°
14
74°
49°
15
70°
49°
16
73°
50°
17
78°
55°
18
73°
49°
19
74°
48°
20
73°
50°
21
72°
49°
22
73°
50°
23
71°
57°
24
81°
58°
25
82°
59°
26
82°
59°
27
84°
60°
28
84°
60°
29
86°
59°
30
84°
52°
31
80°
52°
1
77°
54°
2
81°
60°
3
84°
59°
4
82°
56°
5
85°
53°
6
77°
53°
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 66° to 86°, with overnight lows between 45° and 60°. The average high for May is 76° 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.
