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
92°
72°
14
91°
76°
15
89°
78°
16
88°
74°
17
87°
72°
18
88°
76°
19
87°
74°
20
88°
76°
21
86°
75°
22
87°
76°
23
88°
75°
24
87°
76°
25
87°
75°
26
86°
74°
27
83°
76°
28
83°
76°
29
84°
75°
30
84°
76°
1
85°
76°
2
84°
75°
3
84°
76°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Port St. Lucie
Port St. Lucie's September 2026 forecast shows daily high temperatures ranging from 83° to 92°, with overnight lows between 72° and 78°. The average high for September is 87° with an average low of 75°. 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.
