S
M
T
W
T
F
S
30
79°
67°
31
88°
69°
1
95°
71°
2
88°
70°
3
N/A
4
89°
66°
5
87°
66°
6
80°
63°
7
80°
64°
8
84°
64°
9
85°
58°
10
78°
53°
11
77°
56°
12
73°
55°
13
80°
56°
14
78°
54°
15
80°
52°
16
74°
48°
17
77°
54°
18
73°
50°
19
76°
53°
20
77°
53°
21
76°
52°
22
76°
50°
23
74°
52°
24
76°
52°
25
73°
50°
26
67°
43°
27
63°
39°
28
62°
38°
29
63°
40°
30
63°
38°
1
62°
47°
2
63°
44°
3
61°
42°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Winthrop
Winthrop's September 2026 forecast shows daily high temperatures ranging from 61° to 89°, with overnight lows between 38° and 66°. The average high for September is 74° with an average low of 52°. 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.
