S
M
T
W
T
F
S
30
70°
57°
31
72°
55°
1
72°
50°
2
64°
57°
3
75°
63°
4
66°
54°
5
70°
54°
6
79°
55°
7
73°
57°
8
61°
54°
9
64°
50°
10
64°
50°
11
66°
55°
12
73°
50°
13
70°
63°
14
73°
59°
15
70°
54°
16
63°
52°
17
64°
50°
18
65°
58°
19
68°
55°
20
66°
47°
21
71°
55°
22
73°
57°
23
70°
51°
24
70°
54°
25
70°
54°
26
71°
52°
27
66°
50°
28
66°
52°
29
64°
50°
30
65°
51°
1
67°
48°
2
66°
48°
3
64°
43°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Letchworth Garden City
Letchworth Garden City's September 2026 forecast shows daily high temperatures ranging from 64° to 73°, with overnight lows between 43° and 58°. The average high for September is 68° 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 Letchworth Garden City. See also: October | November | December.
