S
M
T
W
T
F
S
30
74°
52°
31
73°
52°
1
73°
50°
2
74°
49°
3
74°
51°
4
76°
55°
5
74°
56°
6
73°
50°
7
73°
52°
8
74°
56°
9
72°
48°
10
72°
48°
11
73°
52°
12
74°
52°
13
74°
46°
14
70°
55°
15
75°
56°
16
78°
55°
17
76°
50°
18
76°
44°
19
68°
43°
20
66°
43°
21
67°
44°
22
71°
52°
23
73°
52°
24
74°
47°
25
74°
41°
26
69°
42°
27
64°
41°
28
62°
40°
29
63°
41°
30
65°
47°
1
62°
39°
2
63°
37°
3
Hist. Avg.
70°
45°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in St. Lucas
St. Lucas's September 2026 forecast shows daily high temperatures ranging from 62° to 78°, with overnight lows between 37° and 56°. The average high for September is 71° with an average low of 48°. 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 St. Lucas. See also: October | November | December.
