S
M
T
W
T
F
S
26
88°
75°
27
87°
74°
28
88°
75°
29
89°
76°
30
88°
75°
31
87°
76°
1
87°
78°
2
88°
76°
3
89°
74°
4
88°
75°
5
87°
75°
6
88°
76°
7
88°
75°
8
89°
76°
9
88°
75°
10
87°
76°
11
88°
78°
12
89°
78°
13
88°
76°
14
88°
76°
15
88°
78°
16
Hist. Avg.
89°
77°
17
Hist. Avg.
89°
77°
18
Hist. Avg.
89°
77°
19
Hist. Avg.
89°
77°
20
Hist. Avg.
89°
77°
21
Hist. Avg.
89°
77°
22
Hist. Avg.
89°
77°
23
Hist. Avg.
89°
77°
24
Hist. Avg.
89°
77°
25
Hist. Avg.
89°
77°
26
Hist. Avg.
89°
77°
27
Hist. Avg.
89°
77°
28
Hist. Avg.
89°
77°
29
Hist. Avg.
89°
77°
30
Hist. Avg.
89°
77°
31
Hist. Avg.
89°
77°
1
Hist. Avg.
89°
77°
2
Hist. Avg.
89°
77°
3
Hist. Avg.
89°
77°
4
Hist. Avg.
89°
77°
5
Hist. Avg.
89°
76°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
August Weather in San Juan
San Juan's August 2026 forecast shows daily high temperatures ranging from 87° to 89°, with overnight lows between 74° and 78°. The average high for August is 88° with an average low of 76°. 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 San Juan. See also: September | October | November.
