S
M
T
W
T
F
S
26
84°
60°
27
84°
64°
28
78°
60°
29
81°
51°
30
86°
54°
31
84°
63°
1
72°
64°
2
77°
56°
3
80°
47°
4
84°
52°
5
79°
65°
6
78°
56°
7
84°
64°
8
80°
56°
9
75°
55°
10
81°
58°
11
81°
52°
12
82°
58°
13
79°
54°
14
82°
57°
15
82°
50°
16
84°
64°
17
78°
54°
18
81°
51°
19
76°
50°
20
78°
56°
21
78°
58°
22
73°
54°
23
69°
48°
24
69°
44°
25
75°
55°
26
72°
52°
27
71°
50°
28
73°
54°
29
74°
52°
30
77°
57°
31
76°
55°
1
78°
56°
2
79°
51°
3
69°
55°
4
69°
55°
5
70°
51°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in St. Helen
St. Helen's August 2026 forecast shows daily high temperatures ranging from 69° to 79°, with overnight lows between 44° and 58°. The average high for August is 74° with an average low of 53°. 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. Helen. See also: September | October | November.
