S
M
T
W
T
F
S
26
89°
76°
27
88°
75°
28
88°
77°
29
89°
77°
30
88°
76°
31
88°
77°
1
89°
76°
2
90°
77°
3
90°
77°
4
91°
76°
5
91°
77°
6
90°
77°
7
90°
76°
8
91°
77°
9
91°
77°
10
90°
76°
11
88°
76°
12
89°
75°
13
89°
77°
14
87°
77°
15
88°
76°
16
87°
76°
17
91°
75°
18
92°
75°
19
91°
75°
20
90°
74°
21
89°
73°
22
90°
74°
23
90°
74°
24
89°
75°
25
88°
74°
26
88°
74°
27
89°
75°
28
88°
73°
29
88°
73°
30
90°
74°
31
90°
73°
1
89°
75°
2
89°
75°
3
88°
74°
4
89°
74°
5
90°
75°
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 92°, with overnight lows between 73° and 77°. The average high for August is 89° 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.
