S
M
T
W
T
F
S
26
68°
27°
27
71°
33°
28
67°
48°
29
76°
40°
30
82°
42°
1
86°
53°
2
85°
50°
3
88°
51°
4
86°
57°
5
82°
57°
6
81°
56°
7
83°
54°
8
78°
54°
9
77°
55°
10
77°
55°
11
75°
52°
12
71°
47°
13
64°
48°
14
65°
44°
15
70°
50°
16
73°
52°
17
71°
53°
18
69°
51°
19
67°
52°
20
70°
52°
21
70°
53°
22
68°
49°
23
70°
51°
24
74°
53°
25
78°
55°
26
79°
56°
27
79°
56°
28
78°
55°
29
76°
56°
30
79°
57°
31
74°
55°
1
73°
54°
2
76°
56°
3
79°
57°
4
75°
55°
5
76°
56°
6
78°
58°
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 64° to 88°, with overnight lows between 40° and 58°. The average high for May is 76° with an average low of 53°. 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.
