S
M
T
W
T
F
S
26
83°
57°
27
83°
57°
28
84°
58°
29
84°
59°
30
83°
57°
31
76°
54°
1
75°
52°
2
79°
55°
3
83°
57°
4
83°
57°
5
82°
58°
6
84°
59°
7
81°
54°
8
84°
52°
9
76°
51°
10
82°
54°
11
83°
59°
12
84°
57°
13
77°
57°
14
77°
51°
15
78°
52°
16
80°
50°
17
76°
52°
18
77°
52°
19
77°
49°
20
75°
51°
21
75°
52°
22
74°
55°
23
76°
56°
24
75°
54°
25
73°
50°
26
74°
55°
27
77°
57°
28
82°
51°
29
80°
52°
30
81°
52°
31
82°
57°
1
81°
56°
2
82°
58°
3
82°
51°
4
80°
52°
5
79°
59°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in St. Helens
St. Helens's August 2026 forecast shows daily high temperatures ranging from 73° to 84°, with overnight lows between 49° and 59°. The average high for August is 80° 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 August weather will actually feel in St. Helens. See also: September | October | November.
