S
M
T
W
T
F
S
30
86°
77°
31
87°
76°
1
86°
77°
2
85°
77°
3
88°
76°
4
92°
78°
5
91°
72°
6
90°
75°
7
88°
69°
8
86°
74°
9
90°
78°
10
89°
78°
11
88°
77°
12
88°
77°
13
89°
72°
14
87°
73°
15
87°
76°
16
86°
75°
17
86°
78°
18
85°
75°
19
84°
73°
20
85°
73°
21
84°
73°
22
87°
75°
23
N/A
24
N/A
25
N/A
26
82°
69°
27
86°
67°
28
N/A
29
86°
71°
30
87°
71°
1
84°
70°
2
86°
74°
3
87°
76°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Port St. Lucie
Port St. Lucie's September 2026 forecast shows daily high temperatures ranging from ° to °, with overnight lows between ° and °. The average high for September is ° with an average low of °. 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 Port St. Lucie. See also: October | November | December.
