S
M
T
W
T
F
S
27
103°
79°
28
102°
78°
29
102°
80°
30
101°
82°
1
101°
77°
2
95°
78°
3
95°
78°
4
80°
77°
5
84°
76°
6
95°
76°
7
90°
77°
8
94°
77°
9
95°
65°
10
93°
76°
11
90°
75°
12
93°
79°
13
96°
80°
14
97°
78°
15
96°
78°
16
92°
66°
17
84°
65°
18
78°
68°
19
82°
69°
20
86°
67°
21
81°
68°
22
88°
67°
23
82°
63°
24
82°
62°
25
83°
61°
26
82°
61°
27
82°
62°
28
84°
61°
29
83°
65°
30
84°
69°
31
82°
67°
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 78° to 97°, with overnight lows between 61° and 80°. The average high for October is 87° with an average low of 68°. 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.
