S
M
T
W
T
F
S
26
80°
52°
27
81°
61°
28
73°
62°
29
67°
53°
30
64°
45°
1
63°
44°
2
58°
40°
3
68°
35°
4
80°
56°
5
67°
49°
6
62°
46°
7
65°
42°
8
74°
45°
9
78°
54°
10
75°
57°
11
75°
50°
12
80°
46°
13
76°
59°
14
74°
52°
15
80°
47°
16
84°
68°
17
88°
68°
18
85°
70°
19
84°
65°
20
71°
59°
21
71°
61°
22
73°
65°
23
80°
63°
24
80°
65°
25
82°
64°
26
78°
65°
27
81°
66°
28
82°
65°
29
80°
62°
30
82°
61°
31
84°
71°
1
85°
66°
2
85°
65°
3
79°
63°
4
77°
59°
5
78°
61°
6
83°
66°
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 71° to 85°, with overnight lows between 59° and 71°. The average high for May is 80° with an average low of 64°. 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.
