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
87°
64°
3
80°
60°
4
84°
60°
5
86°
65°
6
93°
69°
7
94°
70°
8
88°
69°
9
85°
68°
10
90°
70°
11
89°
66°
12
87°
63°
13
87°
67°
14
89°
66°
15
89°
67°
16
88°
68°
17
89°
70°
18
88°
65°
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 83° to 94°, with overnight lows between 63° and 71°. The average high for May is 87° with an average low of 68°. 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.
