S
M
T
W
T
F
S
26
70°
30°
27
56°
36°
28
54°
38°
29
71°
34°
30
80°
38°
1
71°
44°
2
75°
47°
3
91°
45°
4
78°
47°
5
66°
50°
6
62°
51°
7
71°
46°
8
65°
43°
9
78°
41°
10
64°
46°
11
79°
46°
12
80°
42°
13
60°
46°
14
60°
44°
15
52°
37°
16
54°
39°
17
64°
36°
18
68°
41°
19
68°
44°
20
66°
46°
21
82°
41°
22
79°
44°
23
70°
44°
24
79°
39°
25
61°
43°
26
61°
45°
27
73°
49°
28
73°
51°
29
61°
44°
30
63°
44°
31
69°
47°
1
71°
48°
2
80°
53°
3
72°
49°
4
71°
47°
5
67°
48°
6
68°
47°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Cathlamet
Cathlamet's May 2026 forecast shows daily high temperatures ranging from 61° to 80°, with overnight lows between 44° and 53°. The average high for May is 70° 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 Cathlamet. See also: June | July | August.
