S
M
T
W
T
F
S
26
97°
78°
27
89°
76°
28
93°
75°
29
93°
78°
30
87°
75°
31
90°
75°
1
87°
75°
2
90°
75°
3
86°
76°
4
91°
75°
5
91°
74°
6
90°
75°
7
86°
74°
8
89°
73°
9
90°
74°
10
89°
73°
11
91°
73°
12
91°
73°
13
90°
74°
14
90°
73°
15
91°
74°
16
86°
74°
17
87°
75°
18
88°
74°
19
89°
75°
20
91°
75°
21
91°
74°
22
87°
75°
23
88°
75°
24
88°
74°
25
89°
75°
26
90°
75°
27
90°
74°
28
88°
75°
29
88°
74°
30
90°
75°
31
90°
75°
1
89°
74°
2
89°
74°
3
90°
73°
4
86°
74°
5
86°
74°
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 86° to 91°, with overnight lows between 73° and 76°. The average high for August is 89° with an average low of 74°. 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.
