S
M
T
W
T
F
S
27
90°
80°
28
90°
78°
29
89°
79°
30
89°
79°
1
92°
78°
2
89°
78°
3
89°
79°
4
88°
76°
5
89°
78°
6
91°
77°
7
88°
78°
8
90°
78°
9
90°
78°
10
89°
77°
11
88°
77°
12
89°
76°
13
88°
75°
14
89°
74°
15
88°
78°
16
89°
77°
17
89°
76°
18
88°
77°
19
87°
77°
20
86°
77°
21
86°
76°
22
87°
77°
23
86°
77°
24
87°
76°
25
87°
77°
26
88°
76°
27
86°
77°
28
87°
76°
29
86°
76°
30
85°
75°
31
86°
75°
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 85° to 91°, with overnight lows between 74° and 78°. 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.
