S
M
T
W
T
F
S
30
80°
51°
31
78°
54°
1
79°
52°
2
78°
52°
3
79°
48°
4
79°
46°
5
77°
45°
6
69°
44°
7
69°
45°
8
68°
52°
9
67°
46°
10
69°
48°
11
70°
42°
12
68°
48°
13
68°
51°
14
69°
48°
15
67°
45°
16
66°
43°
17
67°
45°
18
69°
48°
19
75°
45°
20
75°
44°
21
74°
42°
22
66°
39°
23
65°
42°
24
66°
43°
25
64°
40°
26
64°
41°
27
65°
43°
28
65°
43°
29
64°
40°
30
63°
40°
1
64°
45°
2
67°
47°
3
70°
43°
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 63° to 80°, with overnight lows between 39° and 54°. The average high for September is 70° 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.
