S
M
T
W
T
F
S
30
88°
80°
31
85°
79°
1
89°
78°
2
90°
79°
3
91°
78°
4
91°
78°
5
90°
81°
6
90°
80°
7
88°
79°
8
91°
82°
9
92°
82°
10
91°
82°
11
92°
82°
12
91°
80°
13
90°
80°
14
89°
80°
15
89°
80°
16
89°
81°
17
88°
81°
18
90°
79°
19
90°
79°
20
90°
77°
21
89°
76°
22
91°
78°
23
91°
78°
24
N/A
25
91°
77°
26
91°
78°
27
91°
79°
28
91°
78°
29
90°
79°
30
89°
78°
1
90°
76°
2
88°
75°
3
89°
76°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Las Piedras
Las Piedras's September 2026 forecast shows daily high temperatures ranging from 88° to 91°, with overnight lows between 75° and 79°. The average high for September is 90° 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 September weather will actually feel in Las Piedras. See also: October | November | December.
