S
M
T
W
T
F
S
26
80°
47°
27
79°
47°
28
69°
40°
29
68°
37°
30
68°
42°
1
73°
48°
2
78°
44°
3
80°
51°
4
81°
57°
5
70°
51°
6
63°
42°
7
64°
42°
8
62°
40°
9
68°
41°
10
71°
44°
11
72°
37°
12
68°
42°
13
60°
38°
14
59°
33°
15
66°
37°
16
72°
47°
17
71°
46°
18
72°
46°
19
72°
45°
20
71°
46°
21
72°
46°
22
67°
45°
23
67°
45°
24
71°
44°
25
69°
42°
26
65°
40°
27
68°
42°
28
71°
42°
29
71°
43°
30
70°
44°
31
71°
43°
1
71°
40°
2
65°
39°
3
65°
39°
4
69°
40°
5
69°
42°
6
67°
40°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Greytown
Greytown's May 2026 forecast shows daily high temperatures ranging from 59° to 81°, with overnight lows between 33° and 57°. The average high for May is 69° with an average low of 43°. 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 Greytown. See also: June | July | August.