S
M
T
W
T
F
S
26
76°
52°
27
77°
52°
28
81°
51°
29
77°
51°
30
81°
57°
31
84°
63°
1
86°
62°
2
87°
61°
3
86°
59°
4
86°
57°
5
85°
59°
6
83°
60°
7
84°
59°
8
81°
58°
9
84°
57°
10
79°
53°
11
81°
55°
12
83°
52°
13
Hist. Avg.
82°
55°
14
Hist. Avg.
82°
55°
15
Hist. Avg.
82°
55°
16
Hist. Avg.
82°
55°
17
Hist. Avg.
82°
54°
18
Hist. Avg.
82°
54°
19
Hist. Avg.
82°
54°
20
Hist. Avg.
82°
54°
21
Hist. Avg.
82°
54°
22
Hist. Avg.
82°
54°
23
Hist. Avg.
81°
54°
24
Hist. Avg.
81°
54°
25
Hist. Avg.
81°
53°
26
Hist. Avg.
81°
53°
27
Hist. Avg.
81°
53°
28
Hist. Avg.
81°
53°
29
Hist. Avg.
81°
53°
30
Hist. Avg.
80°
53°
31
Hist. Avg.
80°
53°
1
Hist. Avg.
80°
52°
2
Hist. Avg.
80°
52°
3
Hist. Avg.
80°
52°
4
Hist. Avg.
80°
52°
5
Hist. Avg.
80°
52°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
August Weather in St. Helens
St. Helens's August 2026 forecast shows daily high temperatures ranging from 76° to 87°, with overnight lows between 51° and 63°. The average high for August is 82° 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.
