S
M
T
W
T
F
S
26
71°
37°
27
58°
39°
28
59°
45°
29
73°
40°
30
81°
49°
1
74°
50°
2
73°
48°
3
90°
53°
4
75°
52°
5
67°
52°
6
70°
52°
7
71°
50°
8
67°
46°
9
79°
46°
10
69°
53°
11
81°
50°
12
80°
54°
13
63°
50°
14
63°
46°
15
55°
41°
16
57°
40°
17
66°
37°
18
71°
45°
19
69°
44°
20
70°
46°
21
82°
53°
22
81°
52°
23
74°
51°
24
78°
46°
25
63°
48°
26
66°
48°
27
79°
50°
28
81°
54°
29
64°
46°
30
65°
41°
31
72°
45°
1
82°
51°
2
87°
56°
3
73°
48°
4
73°
48°
5
68°
49°
6
64°
48°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Forest Grove-Cornelius
Forest Grove-Cornelius's May 2026 forecast shows daily high temperatures ranging from 64° to 87°, with overnight lows between 41° and 56°. The average high for May is 73° with an average low of 48°. 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 Forest Grove-Cornelius. See also: June | July | August.
