S
M
T
W
T
F
S
26
88°
76°
27
88°
77°
28
89°
76°
29
88°
75°
30
88°
77°
31
89°
76°
1
88°
77°
2
89°
77°
3
89°
76°
4
90°
77°
5
89°
77°
6
88°
76°
7
90°
75°
8
89°
74°
9
88°
75°
10
87°
75°
11
87°
76°
12
88°
76°
13
89°
75°
14
90°
76°
15
90°
76°
16
89°
75°
17
90°
77°
18
89°
77°
19
87°
76°
20
88°
77°
21
90°
73°
22
88°
73°
23
88°
75°
24
87°
74°
25
88°
76°
26
89°
75°
27
88°
76°
28
88°
74°
29
87°
74°
30
87°
75°
31
88°
75°
1
87°
74°
2
87°
75°
3
88°
75°
4
88°
74°
5
87°
73°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Port St. John
Port St. John's August 2026 forecast shows daily high temperatures ranging from 87° to 90°, with overnight lows between 73° and 77°. The average high for August is 88° with an average low of 75°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how August weather will actually feel in Port St. John. See also: September | October | November.
