S
M
T
W
T
F
S
26
87°
70°
27
84°
69°
28
81°
58°
29
81°
56°
30
83°
62°
31
84°
66°
1
79°
63°
2
82°
62°
3
86°
64°
4
90°
66°
5
88°
65°
6
84°
61°
7
83°
64°
8
84°
66°
9
84°
67°
10
85°
62°
11
83°
65°
12
81°
66°
13
80°
65°
14
78°
60°
15
81°
65°
16
83°
65°
17
82°
64°
18
80°
64°
19
80°
65°
20
83°
64°
21
79°
62°
22
82°
66°
23
85°
64°
24
84°
60°
25
80°
64°
26
84°
66°
27
85°
65°
28
85°
65°
29
84°
64°
30
83°
61°
31
75°
56°
1
74°
56°
2
76°
59°
3
79°
62°
4
82°
63°
5
82°
62°
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 74° to 90°, with overnight lows between 56° and 67°. The average high for August is 82° with an average low of 63°. 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.
