S
M
T
W
T
F
S
26
63°
30°
27
63°
36°
28
64°
34°
29
68°
32°
30
75°
36°
1
81°
41°
2
73°
48°
3
82°
45°
4
82°
46°
5
81°
46°
6
82°
52°
7
66°
36°
8
62°
32°
9
73°
39°
10
66°
30°
11
74°
45°
12
68°
40°
13
68°
38°
14
67°
38°
15
59°
35°
16
57°
35°
17
59°
36°
18
53°
36°
19
53°
35°
20
57°
34°
21
51°
36°
22
51°
30°
23
55°
34°
24
60°
37°
25
60°
38°
26
51°
31°
27
52°
31°
28
56°
36°
29
57°
40°
30
61°
40°
31
63°
41°
1
65°
41°
2
64°
39°
3
54°
33°
4
62°
39°
5
63°
35°
6
54°
32°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Willamette Pass
Willamette Pass's May 2026 forecast shows daily high temperatures ranging from 51° to 74°, with overnight lows between 30° and 45°. The average high for May is 60° with an average low of 36°. 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 Willamette Pass. See also: June | July | August.
