S
M
T
W
T
F
S
26
59°
46°
27
64°
40°
28
69°
42°
29
61°
38°
30
62°
42°
1
65°
45°
2
65°
41°
3
66°
42°
4
68°
46°
5
72°
49°
6
73°
50°
7
74°
52°
8
74°
52°
9
73°
51°
10
73°
49°
11
64°
45°
12
66°
48°
13
70°
49°
14
67°
45°
15
67°
46°
16
71°
50°
17
75°
53°
18
70°
47°
19
70°
44°
20
68°
44°
21
69°
47°
22
68°
46°
23
69°
47°
24
67°
55°
25
71°
54°
26
76°
52°
27
79°
52°
28
72°
58°
29
80°
57°
30
81°
48°
31
73°
50°
1
72°
52°
2
75°
52°
3
78°
54°
4
79°
53°
5
82°
50°
6
73°
50°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Greencastle
Greencastle's May 2026 forecast shows daily high temperatures ranging from 59° to 82°, with overnight lows between 38° and 58°. The average high for May is 71° with an average low of 48°. 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 Greencastle. See also: June | July | August.
