S
M
T
W
T
F
S
30
74°
48°
31
81°
44°
1
74°
45°
2
75°
44°
3
73°
51°
4
77°
52°
5
81°
51°
6
81°
50°
7
71°
43°
8
71°
43°
9
72°
45°
10
73°
48°
11
77°
48°
12
79°
51°
13
70°
50°
14
73°
52°
15
70°
49°
16
70°
49°
17
71°
44°
18
70°
50°
19
69°
46°
20
72°
42°
21
71°
41°
22
68°
42°
23
68°
45°
24
73°
46°
25
75°
48°
26
75°
47°
27
Hist. Avg.
72°
48°
28
Hist. Avg.
72°
48°
29
Hist. Avg.
72°
48°
30
Hist. Avg.
71°
47°
1
Hist. Avg.
71°
47°
2
Hist. Avg.
70°
47°
3
Hist. Avg.
70°
47°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Saint Helens
Saint Helens's September 2026 forecast shows daily high temperatures ranging from 68° to 81°, with overnight lows between 41° and 52°. The average high for September is 73° with an average low of 47°. 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 Saint Helens. See also: October | November | December.
