S
M
T
W
T
F
S
26
78°
58°
27
83°
52°
28
79°
55°
29
81°
57°
30
83°
50°
31
90°
52°
1
74°
52°
2
75°
48°
3
81°
55°
4
91°
61°
5
90°
56°
6
94°
54°
7
90°
54°
8
90°
52°
9
84°
56°
10
79°
56°
11
79°
61°
12
77°
58°
13
83°
58°
14
86°
58°
15
82°
57°
16
81°
56°
17
78°
57°
18
76°
58°
19
81°
59°
20
79°
57°
21
82°
58°
22
85°
59°
23
78°
56°
24
82°
58°
25
82°
57°
26
81°
58°
27
79°
57°
28
78°
54°
29
78°
56°
30
75°
55°
31
77°
56°
1
78°
58°
2
72°
53°
3
79°
55°
4
82°
58°
5
82°
57°
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 72° to 86°, with overnight lows between 53° and 61°. The average high for August is 80° with an average low of 57°. 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.
