S
M
T
W
T
F
S
26
88°
67°
27
84°
66°
28
89°
63°
29
89°
64°
30
89°
69°
1
91°
72°
2
85°
61°
3
80°
59°
4
83°
60°
5
87°
65°
6
91°
69°
7
91°
68°
8
83°
62°
9
85°
63°
10
87°
67°
11
86°
66°
12
84°
66°
13
87°
67°
14
87°
66°
15
86°
64°
16
83°
65°
17
84°
64°
18
84°
67°
19
88°
68°
20
88°
68°
21
84°
67°
22
83°
66°
23
83°
63°
24
84°
65°
25
84°
69°
26
86°
69°
27
84°
68°
28
84°
69°
29
85°
68°
30
86°
69°
31
85°
70°
1
84°
70°
2
85°
69°
3
85°
71°
4
86°
71°
5
85°
70°
6
86°
71°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Umatilla
Umatilla's May 2026 forecast shows daily high temperatures ranging from 80° to 91°, with overnight lows between 59° and 71°. The average high for May is 85° with an average low of 67°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how May weather will actually feel in Umatilla. See also: June | July | August.
