S
M
T
W
T
F
S
26
62°
47°
27
68°
48°
28
77°
42°
29
80°
45°
30
82°
45°
1
79°
47°
2
68°
50°
3
70°
49°
4
67°
51°
5
70°
52°
6
78°
52°
7
83°
54°
8
83°
53°
9
86°
54°
10
88°
56°
11
93°
55°
12
83°
54°
13
83°
53°
14
81°
54°
15
78°
51°
16
81°
55°
17
82°
54°
18
81°
54°
19
82°
55°
20
83°
55°
21
82°
54°
22
82°
55°
23
83°
56°
24
84°
56°
25
84°
55°
26
83°
55°
27
79°
54°
28
78°
54°
29
80°
55°
30
81°
55°
31
80°
56°
1
82°
56°
2
84°
57°
3
84°
56°
4
81°
56°
5
81°
55°
6
78°
52°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in St. Helena
St. Helena's May 2026 forecast shows daily high temperatures ranging from 67° to 93°, with overnight lows between 49° and 57°. The average high for May is 81° with an average low of 54°. 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 St. Helena. See also: June | July | August.
