S
M
T
W
T
F
S
26
86°
68°
27
81°
67°
28
82°
64°
29
87°
61°
30
90°
68°
1
89°
73°
2
87°
67°
3
77°
66°
4
79°
66°
5
82°
61°
6
88°
62°
7
95°
66°
8
89°
68°
9
92°
71°
10
92°
71°
11
91°
72°
12
82°
72°
13
88°
73°
14
85°
71°
15
86°
66°
16
87°
76°
17
86°
76°
18
87°
73°
19
86°
76°
20
87°
68°
21
84°
69°
22
87°
75°
23
89°
74°
24
87°
79°
25
89°
77°
26
89°
79°
27
89°
78°
28
90°
75°
29
91°
73°
30
88°
74°
31
89°
76°
1
90°
76°
2
94°
70°
3
82°
73°
4
83°
68°
5
84°
65°
6
85°
67°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Port St. John
Port St. John's May 2026 forecast shows daily high temperatures ranging from ° to °, with overnight lows between ° and °. The average high for May is ° with an average low of °. 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 Port St. John. See also: June | July | August.
