S
M
T
W
T
F
S
26
82°
63°
27
85°
59°
28
83°
65°
29
83°
66°
30
77°
67°
1
67°
56°
2
74°
47°
3
77°
44°
4
77°
48°
5
80°
52°
6
83°
71°
7
79°
67°
8
71°
65°
9
72°
65°
10
83°
64°
11
83°
66°
12
82°
66°
13
85°
63°
14
86°
58°
15
82°
54°
16
83°
58°
17
82°
59°
18
85°
63°
19
86°
69°
20
86°
67°
21
84°
69°
22
85°
68°
23
86°
69°
24
77°
70°
25
79°
70°
26
79°
69°
27
81°
70°
28
80°
69°
29
83°
71°
30
84°
67°
31
86°
66°
1
83°
64°
2
87°
68°
3
85°
67°
4
86°
66°
5
88°
67°
6
85°
70°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Harleston
Harleston's May 2026 forecast shows daily high temperatures ranging from 77° to 88°, with overnight lows between 64° and 71°. The average high for May is 83° with an average low of 68°. 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 Harleston. See also: June | July | August.
