S
M
T
W
T
F
S
30
66°
57°
31
64°
54°
1
68°
52°
2
66°
57°
3
70°
59°
4
64°
57°
5
64°
55°
6
73°
55°
7
66°
57°
8
61°
54°
9
63°
50°
10
63°
48°
11
64°
54°
12
70°
52°
13
70°
59°
14
73°
61°
15
64°
55°
16
61°
55°
17
61°
55°
18
63°
54°
19
66°
55°
20
61°
52°
21
66°
55°
22
69°
57°
23
62°
45°
24
65°
52°
25
64°
48°
26
63°
51°
27
65°
50°
28
62°
51°
29
63°
55°
30
65°
52°
1
62°
50°
2
63°
48°
3
57°
47°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
September Weather in St Helens
St Helens's September 2026 forecast shows daily high temperatures ranging from 57° to 69°, with overnight lows between 45° and 57°. The average high for September is 64° with an average low of 51°. 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 St Helens. See also: October | November | December.
