S
M
T
W
T
F
S
26
69°
51°
27
67°
43°
28
70°
42°
29
75°
46°
30
80°
59°
1
82°
59°
2
79°
61°
3
62°
53°
4
58°
54°
5
59°
51°
6
62°
48°
7
55°
43°
8
58°
53°
9
61°
53°
10
58°
49°
11
64°
51°
12
72°
46°
13
68°
53°
14
71°
54°
15
67°
56°
16
63°
57°
17
66°
50°
18
65°
44°
19
60°
48°
20
61°
49°
21
61°
45°
22
58°
38°
23
57°
47°
24
62°
53°
25
58°
54°
26
62°
53°
27
60°
55°
28
61°
45°
29
58°
48°
30
59°
46°
31
57°
46°
1
54°
45°
2
60°
53°
3
56°
50°
4
55°
48°
5
58°
42°
6
62°
47°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Portland
Portland's May 2026 forecast shows daily high temperatures ranging from ° to °, with overnight lows between ° and °. The average high for May is ° with an average low of °. 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 Portland. See also: June | July | August.
