S
M
T
W
T
F
S
26
37°
30°
27
35°
29°
28
38°
29°
29
39°
33°
30
41°
28°
1
48°
28°
2
53°
32°
3
40°
33°
4
48°
33°
5
49°
36°
6
48°
37°
7
51°
38°
8
40°
36°
9
46°
36°
10
52°
38°
11
49°
39°
12
41°
37°
13
N/A
14
53°
41°
15
60°
40°
16
48°
40°
17
52°
40°
18
49°
35°
19
49°
35°
20
48°
34°
21
47°
37°
22
50°
38°
23
49°
38°
24
52°
39°
25
52°
41°
26
51°
39°
27
50°
39°
28
51°
38°
29
50°
38°
30
50°
39°
31
51°
40°
1
51°
39°
2
52°
39°
3
50°
40°
4
51°
39°
5
51°
39°
6
52°
40°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
May Weather in St. John Island
St. John Island's May 2026 forecast shows daily high temperatures ranging from 47° to 60°, with overnight lows between 34° and 41°. The average high for May is 51° with an average low of 39°. 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. John Island. See also: June | July | August.
