S
M
T
W
T
F
S
26
89°
58°
27
87°
57°
28
90°
62°
29
86°
59°
30
93°
67°
31
94°
58°
1
87°
60°
2
79°
47°
3
83°
48°
4
88°
45°
5
93°
48°
6
97°
52°
7
100°
54°
8
96°
55°
9
91°
56°
10
93°
62°
11
91°
63°
12
90°
66°
13
89°
62°
14
90°
59°
15
90°
64°
16
94°
63°
17
95°
69°
18
92°
60°
19
92°
57°
20
94°
61°
21
93°
62°
22
87°
59°
23
92°
58°
24
93°
61°
25
94°
61°
26
95°
59°
27
88°
54°
28
81°
54°
29
81°
50°
30
83°
54°
31
89°
58°
1
90°
58°
2
89°
57°
3
90°
58°
4
90°
58°
5
88°
57°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Hermiston
Hermiston's August 2026 forecast shows daily high temperatures ranging from 81° to 95°, with overnight lows between 50° and 69°. The average high for August is 90° with an average low of 59°. 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 Hermiston. See also: September | October | November.
