S
M
T
W
T
F
S
26
98°
79°
27
97°
80°
28
90°
75°
29
85°
69°
30
87°
68°
31
81°
70°
1
78°
67°
2
83°
67°
3
86°
66°
4
89°
70°
5
89°
73°
6
79°
68°
7
91°
69°
8
91°
70°
9
94°
75°
10
93°
78°
11
96°
80°
12
91°
77°
13
96°
77°
14
94°
79°
15
93°
78°
16
92°
74°
17
84°
65°
18
87°
71°
19
83°
70°
20
83°
62°
21
84°
67°
22
87°
64°
23
84°
67°
24
86°
67°
25
87°
69°
26
86°
69°
27
88°
68°
28
87°
67°
29
87°
66°
30
86°
67°
31
90°
72°
1
87°
71°
2
85°
69°
3
80°
64°
4
80°
61°
5
81°
64°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in St. John
St. John's August 2026 forecast shows daily high temperatures ranging from 80° to 90°, with overnight lows between 61° and 72°. The average high for August is 85° with an average low of 67°. 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 St. John. See also: September | October | November.
