S
M
T
W
T
F
S
26
87°
80°
27
87°
80°
28
86°
79°
29
88°
79°
30
87°
80°
31
87°
80°
1
88°
79°
2
87°
79°
3
86°
78°
4
88°
80°
5
87°
80°
6
87°
79°
7
88°
80°
8
87°
80°
9
87°
79°
10
86°
80°
11
87°
80°
12
87°
79°
13
88°
79°
14
90°
77°
15
89°
77°
16
89°
78°
17
90°
77°
18
89°
77°
19
89°
78°
20
90°
78°
21
90°
77°
22
89°
77°
23
89°
78°
24
90°
77°
25
89°
76°
26
90°
76°
27
89°
78°
28
90°
79°
29
89°
78°
30
90°
78°
31
90°
77°
1
89°
78°
2
90°
78°
3
90°
77°
4
89°
77°
5
88°
78°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Saint John
Saint John's August 2026 forecast shows daily high temperatures ranging from 86° to 90°, with overnight lows between 76° and 80°. The average high for August 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 August weather will actually feel in Saint John. See also: September | October | November.
