S
M
T
W
T
F
S
27
90°
80°
28
90°
78°
29
89°
79°
30
89°
79°
1
92°
78°
2
90°
78°
3
89°
78°
4
90°
78°
5
90°
79°
6
89°
78°
7
89°
78°
8
88°
77°
9
88°
76°
10
89°
74°
11
88°
75°
12
87°
76°
13
88°
76°
14
90°
77°
15
87°
76°
16
86°
77°
17
86°
77°
18
87°
76°
19
87°
77°
20
88°
77°
21
86°
76°
22
86°
77°
23
87°
77°
24
86°
76°
25
86°
76°
26
87°
76°
27
88°
76°
28
87°
76°
29
86°
76°
30
86°
77°
31
87°
76°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
October Weather in San Juan
San Juan's October 2026 forecast shows daily high temperatures ranging from 86° to 90°, with overnight lows between 74° and 79°. The average high for October is 88° with an average low of 77°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how October weather will actually feel in San Juan. See also: November | December | January.
