S
M
T
W
T
F
S
30
73°
57°
31
76°
56°
1
81°
52°
2
80°
47°
3
71°
53°
4
74°
56°
5
70°
48°
6
79°
43°
7
70°
44°
8
70°
45°
9
69°
51°
10
71°
53°
11
72°
52°
12
74°
48°
13
76°
43°
14
67°
42°
15
65°
40°
16
66°
41°
17
66°
45°
18
69°
40°
19
70°
38°
20
64°
43°
21
65°
50°
22
70°
41°
23
73°
48°
24
72°
50°
25
72°
50°
26
70°
49°
27
71°
42°
28
70°
39°
29
60°
43°
30
58°
44°
1
65°
43°
2
66°
47°
3
58°
34°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Westport
Westport's September 2026 forecast shows daily high temperatures ranging from 58° to 81°, with overnight lows between 34° and 57°. The average high for September is 70° with an average low of 46°. 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 Westport. See also: October | November | December.
