S
M
T
W
T
F
S
28
91°
78°
29
91°
80°
30
92°
79°
1
92°
79°
2
91°
79°
3
89°
78°
4
91°
80°
5
89°
81°
6
91°
79°
7
89°
79°
8
89°
79°
9
90°
81°
10
89°
80°
11
89°
80°
12
88°
80°
13
88°
80°
14
89°
79°
15
88°
78°
16
87°
77°
17
88°
76°
18
87°
77°
19
89°
77°
20
87°
78°
21
88°
79°
22
87°
77°
23
87°
76°
24
87°
76°
25
86°
75°
26
86°
76°
27
87°
77°
28
86°
77°
29
86°
78°
30
87°
77°
31
84°
76°
1
85°
77°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
July Weather in San Juan
San Juan's July 2026 forecast shows daily high temperatures ranging from 84° to 90°, with overnight lows between 75° and 81°. The average high for July is 87° with an average low of 78°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how July weather will actually feel in San Juan. See also: August | September | October.
