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
88°
76°
7
87°
75°
8
86°
73°
9
87°
75°
10
88°
78°
11
87°
77°
12
88°
77°
13
88°
78°
14
88°
77°
15
87°
75°
16
88°
78°
17
88°
78°
18
88°
75°
19
88°
77°
20
88°
77°
21
88°
76°
22
89°
77°
23
88°
77°
24
88°
78°
25
89°
77°
26
87°
77°
27
88°
76°
28
87°
77°
29
89°
78°
30
88°
77°
31
90°
78°
1
86°
79°
2
86°
79°
3
86°
78°
4
86°
79°
5
86°
79°
6
86°
78°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Saint John
Saint John's May 2026 forecast shows daily high temperatures ranging from 86° to 90°, with overnight lows between 76° and 79°. The average high for May is 88° 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 Saint John. See also: June | July | August.
