S
M
T
W
T
F
S
30
101°
79°
31
100°
78°
1
101°
77°
2
102°
75°
3
106°
74°
4
101°
78°
5
100°
73°
6
100°
74°
7
101°
74°
8
100°
77°
9
101°
77°
10
98°
73°
11
101°
71°
12
105°
76°
13
103°
77°
14
100°
77°
15
99°
76°
16
101°
75°
17
99°
73°
18
96°
69°
19
95°
68°
20
87°
64°
21
90°
63°
22
85°
63°
23
88°
64°
24
89°
66°
25
92°
67°
26
85°
60°
27
89°
66°
28
87°
66°
29
84°
66°
30
83°
65°
1
84°
65°
2
86°
64°
3
86°
64°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Stamford
Stamford's September 2026 forecast shows daily high temperatures ranging from 83° to 103°, with overnight lows between 60° and 77°. The average high for September is 91° with an average low of 68°. 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 Stamford. See also: October | November | December.
