S
M
T
W
T
F
S
26
79°
60°
27
74°
59°
28
81°
61°
29
81°
61°
30
80°
60°
31
81°
61°
1
81°
60°
2
79°
61°
3
81°
60°
4
78°
59°
5
75°
60°
6
80°
60°
7
81°
57°
8
73°
52°
9
73°
52°
10
74°
57°
11
73°
59°
12
74°
59°
13
79°
61°
14
81°
60°
15
80°
58°
16
73°
57°
17
73°
50°
18
76°
58°
19
75°
58°
20
79°
56°
21
80°
57°
22
77°
55°
23
74°
50°
24
72°
49°
25
73°
51°
26
73°
51°
27
75°
49°
28
76°
49°
29
76°
53°
30
78°
52°
31
78°
56°
1
77°
55°
2
77°
48°
3
76°
45°
4
68°
46°
5
69°
54°
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 68° to 81°, with overnight lows between 45° and 61°. The average high for August is 77° with an average low of 56°. 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.
