S
M
T
W
T
F
S
29
39°
21°
30
50°
34°
31
43°
35°
1
50°
33°
2
38°
29°
3
41°
32°
4
47°
35°
5
44°
35°
6
45°
31°
7
40°
28°
8
44°
24°
9
47°
35°
10
50°
38°
11
53°
31°
12
55°
37°
13
56°
49°
14
68°
46°
15
55°
36°
16
49°
32°
17
49°
34°
18
51°
38°
19
55°
36°
20
57°
41°
21
55°
35°
22
48°
36°
23
49°
38°
24
51°
37°
25
56°
38°
26
60°
40°
27
52°
38°
28
52°
35°
29
53°
33°
30
59°
36°
1
56°
41°
2
61°
38°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
April Weather in Sullivan
Sullivan's April 2026 forecast shows daily high temperatures ranging from 44° to 68°, with overnight lows between 24° and 49°. The average high for April is 54° with an average low of 37°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how April weather will actually feel in Sullivan. See also: May | June | July.
