S
M
T
W
T
F
S
26
79°
43°
27
80°
44°
28
80°
49°
29
78°
53°
30
69°
60°
31
73°
60°
1
72°
56°
2
71°
55°
3
71°
62°
4
76°
54°
5
83°
54°
6
87°
51°
7
91°
56°
8
76°
60°
9
80°
59°
10
81°
54°
11
76°
53°
12
77°
52°
13
75°
47°
14
77°
49°
15
78°
48°
16
72°
51°
17
67°
56°
18
75°
61°
19
82°
62°
20
79°
60°
21
79°
52°
22
76°
63°
23
71°
64°
24
68°
57°
25
72°
54°
26
75°
53°
27
76°
54°
28
72°
53°
29
75°
52°
30
71°
53°
31
75°
52°
1
68°
52°
2
73°
50°
3
71°
45°
4
69°
53°
5
65°
52°
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 65° to 79°, with overnight lows between 45° and 64°. The average high for August is 72° with an average low of 54°. 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.
