S
M
T
W
T
F
S
30
83°
56°
31
83°
46°
1
82°
45°
2
70°
44°
3
69°
43°
4
68°
46°
5
69°
46°
6
76°
55°
7
80°
46°
8
81°
44°
9
71°
45°
10
71°
42°
11
70°
52°
12
74°
42°
13
72°
39°
14
66°
46°
15
69°
52°
16
75°
46°
17
73°
41°
18
67°
47°
19
71°
41°
20
74°
39°
21
65°
44°
22
63°
52°
23
75°
42°
24
76°
41°
25
71°
47°
26
63°
48°
27
68°
46°
28
71°
48°
29
70°
49°
30
73°
41°
1
74°
35°
2
70°
35°
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 83°, with overnight lows between 34° and 56°. The average high for September is 72° with an average low of 45°. 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.
