S
M
T
W
T
F
S
30
70°
56°
31
70°
56°
1
66°
54°
2
64°
52°
3
64°
51°
4
65°
51°
5
65°
52°
6
68°
55°
7
68°
50°
8
67°
50°
9
69°
55°
10
69°
54°
11
66°
54°
12
63°
53°
13
64°
52°
14
62°
47°
15
62°
48°
16
63°
48°
17
62°
49°
18
63°
52°
19
62°
49°
20
61°
48°
21
61°
48°
22
62°
53°
23
64°
52°
24
65°
49°
25
64°
47°
26
62°
47°
27
60°
51°
28
59°
52°
29
60°
51°
30
59°
47°
1
59°
48°
2
60°
45°
3
58°
46°
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 58° to 70°, with overnight lows between 45° and 56°. 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.
