S
M
T
W
T
F
S
30
75°
61°
31
73°
57°
1
72°
54°
2
70°
57°
3
75°
66°
4
70°
57°
5
68°
52°
6
71°
61°
7
75°
57°
8
69°
50°
9
67°
50°
10
66°
56°
11
71°
51°
12
68°
53°
13
69°
57°
14
70°
58°
15
70°
54°
16
65°
56°
17
65°
53°
18
66°
55°
19
65°
53°
20
66°
56°
21
67°
56°
22
67°
55°
23
66°
55°
24
67°
54°
25
67°
54°
26
64°
53°
27
64°
54°
28
63°
53°
29
63°
52°
30
65°
53°
1
64°
49°
2
63°
53°
3
64°
53°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in Leiston
Leiston's September 2026 forecast shows daily high temperatures ranging from 63° to 75°, with overnight lows between 49° and 61°. The average high for September is 67° with an average low of 54°. 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 Leiston. See also: October | November | December.
