S
M
T
W
T
F
S
30
73°
56°
31
76°
52°
1
77°
51°
2
75°
59°
3
65°
60°
4
80°
60°
5
72°
55°
6
71°
52°
7
79°
57°
8
77°
50°
9
67°
63°
10
81°
54°
11
71°
47°
12
70°
54°
13
74°
55°
14
73°
56°
15
71°
51°
16
68°
49°
17
67°
51°
18
66°
48°
19
68°
49°
20
69°
53°
21
62°
52°
22
63°
52°
23
64°
51°
24
68°
51°
25
65°
50°
26
66°
49°
27
62°
46°
28
62°
47°
29
68°
50°
30
68°
50°
1
67°
49°
2
66°
50°
3
64°
49°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Winthrop
Winthrop's September 2026 forecast shows daily high temperatures ranging from 62° to 81°, with overnight lows between 46° and 63°. The average high for September is 68° with an average low of 51°. 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 Winthrop. See also: October | November | December.
