S
M
T
W
T
F
S
26
94°
67°
27
95°
69°
28
92°
67°
29
85°
63°
30
84°
63°
31
85°
66°
1
91°
67°
2
94°
69°
3
89°
57°
4
85°
59°
5
87°
65°
6
94°
66°
7
91°
61°
8
88°
57°
9
85°
58°
10
86°
62°
11
90°
60°
12
91°
65°
13
93°
66°
14
93°
67°
15
92°
66°
16
92°
66°
17
93°
63°
18
91°
59°
19
82°
58°
20
83°
58°
21
82°
57°
22
82°
54°
23
80°
55°
24
82°
58°
25
85°
60°
26
89°
62°
27
89°
62°
28
88°
63°
29
89°
62°
30
88°
61°
31
88°
62°
1
87°
61°
2
86°
61°
3
86°
60°
4
83°
58°
5
82°
56°
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 80° to 95°, with overnight lows between 54° and 69°. The average high for August is 88° 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.
