S
M
T
W
T
F
S
26
84°
61°
27
93°
67°
28
94°
66°
29
93°
68°
30
94°
68°
31
94°
67°
1
91°
67°
2
92°
66°
3
94°
68°
4
94°
68°
5
93°
67°
6
93°
68°
7
94°
68°
8
93°
67°
9
94°
70°
10
82°
57°
11
81°
56°
12
82°
57°
13
84°
61°
14
87°
59°
15
85°
60°
16
85°
61°
17
90°
61°
18
90°
64°
19
92°
67°
20
95°
68°
21
94°
66°
22
94°
61°
23
91°
57°
24
85°
57°
25
86°
55°
26
87°
57°
27
89°
62°
28
91°
61°
29
90°
57°
30
86°
62°
31
89°
56°
1
79°
58°
2
86°
53°
3
79°
56°
4
78°
57°
5
81°
61°
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 78° to 95°, with overnight lows between 53° and 70°. The average high for August is 89° with an average low of 62°. 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.
