S
M
T
W
T
F
S
26
85°
75°
27
86°
75°
28
86°
75°
29
86°
75°
30
86°
74°
1
86°
74°
2
87°
74°
3
87°
74°
4
88°
76°
5
87°
75°
6
89°
78°
7
88°
77°
8
88°
77°
9
87°
77°
10
87°
78°
11
88°
78°
12
87°
77°
13
87°
77°
14
86°
76°
15
87°
77°
16
87°
76°
17
87°
76°
18
88°
77°
19
84°
79°
20
85°
80°
21
86°
78°
22
85°
79°
23
84°
79°
24
85°
80°
25
85°
80°
26
86°
79°
27
85°
80°
28
85°
80°
29
86°
79°
30
85°
80°
31
86°
80°
1
85°
79°
2
85°
80°
3
86°
79°
4
85°
80°
5
85°
80°
6
86°
79°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in St John
St John's May 2026 forecast shows daily high temperatures ranging from 84° to 89°, with overnight lows between 76° and 80°. The average high for May is 86° with an average low of 78°. 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. See also: June | July | August.
