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
99°
77°
10
97°
75°
11
100°
77°
12
102°
76°
13
100°
78°
14
101°
76°
15
99°
73°
16
97°
73°
17
99°
71°
18
95°
69°
19
84°
64°
20
86°
63°
21
84°
62°
22
86°
61°
23
87°
67°
24
79°
66°
25
90°
67°
26
89°
66°
27
89°
66°
28
88°
65°
29
88°
66°
30
87°
65°
1
88°
64°
2
88°
64°
3
87°
63°
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 79° to 102°, with overnight lows between 61° and 78°. The average high for September is 92° with an average low of 69°. 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.
