S
M
T
W
T
F
S
30
95°
68°
31
90°
69°
1
92°
70°
2
92°
69°
3
93°
68°
4
92°
68°
5
91°
69°
6
92°
66°
7
90°
66°
8
89°
66°
9
89°
65°
10
90°
64°
11
90°
66°
12
91°
66°
13
90°
67°
14
92°
65°
15
Hist. Avg.
87°
63°
16
Hist. Avg.
86°
63°
17
Hist. Avg.
86°
62°
18
Hist. Avg.
86°
62°
19
Hist. Avg.
86°
62°
20
Hist. Avg.
85°
61°
21
Hist. Avg.
85°
61°
22
Hist. Avg.
85°
60°
23
Hist. Avg.
84°
60°
24
Hist. Avg.
84°
60°
25
Hist. Avg.
84°
59°
26
Hist. Avg.
83°
59°
27
Hist. Avg.
83°
58°
28
Hist. Avg.
83°
58°
29
Hist. Avg.
82°
58°
30
Hist. Avg.
82°
57°
1
Hist. Avg.
82°
57°
2
Hist. Avg.
81°
56°
3
Hist. Avg.
81°
56°
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 89° to 95°, with overnight lows between 64° and 70°. The average high for September is 91° with an average low of 67°. 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.
