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
91°
54°
15
91°
64°
16
93°
61°
17
93°
65°
18
98°
62°
19
93°
59°
20
96°
62°
21
92°
72°
22
89°
63°
23
86°
62°
24
89°
64°
25
89°
63°
26
88°
62°
27
87°
61°
28
86°
60°
29
85°
58°
30
84°
59°
31
89°
64°
1
88°
64°
2
88°
63°
3
87°
63°
4
87°
62°
5
86°
63°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Umatilla
Umatilla's August 2026 forecast shows daily high temperatures ranging from 84° to 98°, with overnight lows between 58° and 72°. The average high for August is 89° with an average low of 63°. 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 Umatilla. See also: September | October | November.
