S
M
T
W
T
F
S
26
80°
54°
27
84°
56°
28
82°
56°
29
79°
59°
30
79°
57°
31
84°
58°
1
84°
59°
2
85°
60°
3
85°
59°
4
84°
58°
5
84°
58°
6
85°
62°
7
87°
62°
8
85°
61°
9
77°
57°
10
76°
57°
11
76°
54°
12
77°
54°
13
77°
55°
14
81°
59°
15
81°
58°
16
78°
55°
17
77°
53°
18
80°
52°
19
83°
53°
20
84°
57°
21
81°
56°
22
84°
60°
23
84°
55°
24
75°
58°
25
82°
56°
26
77°
49°
27
76°
51°
28
75°
54°
29
74°
51°
30
74°
51°
31
76°
57°
1
79°
59°
2
84°
58°
3
86°
58°
4
80°
50°
5
73°
51°
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 73° to 87°, with overnight lows between 49° and 62°. The average high for August is 80° with an average low of 56°. 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.
