S
M
T
W
T
F
S
26
87°
68°
27
86°
68°
28
87°
67°
29
86°
65°
30
83°
60°
31
78°
59°
1
78°
65°
2
79°
64°
3
84°
65°
4
85°
65°
5
82°
66°
6
83°
65°
7
80°
63°
8
78°
63°
9
78°
62°
10
81°
62°
11
83°
64°
12
84°
65°
13
85°
66°
14
86°
60°
15
82°
67°
16
86°
62°
17
85°
57°
18
78°
56°
19
75°
55°
20
76°
55°
21
77°
56°
22
78°
56°
23
78°
57°
24
79°
57°
25
81°
59°
26
83°
62°
27
83°
56°
28
76°
54°
29
76°
55°
30
77°
62°
31
80°
55°
1
79°
52°
2
76°
53°
3
75°
55°
4
78°
62°
5
82°
56°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in St. Johns
St. Johns's August 2026 forecast shows daily high temperatures ranging from 75° to 87°, with overnight lows between 52° and 68°. The average high for August is 81° with an average low of 61°. 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. Johns. See also: September | October | November.
