S
M
T
W
T
F
S
30
81°
52°
31
82°
52°
1
81°
48°
2
80°
47°
3
78°
48°
4
77°
49°
5
75°
43°
6
73°
50°
7
75°
51°
8
80°
52°
9
80°
51°
10
72°
43°
11
70°
45°
12
75°
46°
13
78°
52°
14
79°
51°
15
78°
47°
16
71°
42°
17
70°
45°
18
74°
46°
19
69°
44°
20
77°
50°
21
76°
51°
22
Hist. Avg.
74°
49°
23
Hist. Avg.
74°
49°
24
Hist. Avg.
74°
48°
25
Hist. Avg.
73°
48°
26
Hist. Avg.
73°
48°
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 69° to 82°, with overnight lows between 42° and 52°. The average high for September is 76° with an average low of 48°. 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.
