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
64°
37°
5
65°
40°
6
69°
38°
7
67°
39°
8
55°
34°
9
62°
37°
10
70°
41°
11
65°
36°
12
63°
33°
13
65°
35°
14
62°
34°
15
58°
32°
16
56°
33°
17
58°
35°
18
49°
31°
19
50°
30°
20
54°
34°
21
62°
39°
22
60°
38°
23
56°
36°
24
62°
40°
25
59°
37°
26
58°
36°
27
62°
41°
28
62°
41°
29
63°
40°
30
64°
41°
31
65°
42°
1
64°
41°
2
63°
40°
3
63°
39°
4
62°
35°
5
60°
35°
6
59°
34°
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 49° to 70°, with overnight lows between 30° and 42°. The average high for May is 61° with an average low of 37°. 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.
