S
M
T
W
T
F
S
26
85°
67°
27
80°
58°
28
78°
65°
29
84°
65°
30
81°
62°
31
81°
66°
1
82°
60°
2
81°
58°
3
80°
57°
4
78°
57°
5
79°
58°
6
79°
58°
7
82°
59°
8
82°
62°
9
85°
61°
10
84°
62°
11
83°
64°
12
85°
65°
13
85°
66°
14
84°
64°
15
84°
58°
16
82°
57°
17
78°
58°
18
77°
60°
19
76°
57°
20
76°
56°
21
77°
63°
22
81°
62°
23
84°
63°
24
85°
64°
25
84°
56°
26
84°
55°
27
76°
55°
28
76°
56°
29
77°
62°
30
80°
63°
31
83°
62°
1
83°
55°
2
80°
55°
3
82°
60°
4
82°
61°
5
78°
60°
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 76° to 85°, with overnight lows between 55° and 67°. The average high for August is 81° with an average low of 60°. 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.
