S
M
T
W
T
F
S
26
53°
41°
27
49°
37°
28
55°
34°
29
59°
35°
30
60°
34°
1
64°
46°
2
71°
41°
3
74°
47°
4
72°
51°
5
58°
43°
6
59°
43°
7
75°
44°
8
76°
49°
9
73°
49°
10
78°
45°
11
87°
54°
12
89°
62°
13
83°
62°
14
74°
52°
15
79°
50°
16
61°
38°
17
41°
31°
18
42°
32°
19
49°
34°
20
54°
39°
21
66°
38°
22
72°
42°
23
73°
39°
24
72°
40°
25
72°
43°
26
71°
44°
27
70°
42°
28
71°
43°
29
68°
37°
30
61°
34°
31
62°
32°
1
65°
35°
2
66°
36°
3
68°
37°
4
71°
41°
5
74°
44°
6
72°
43°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
May Weather in Eureka
Eureka's May 2026 forecast shows daily high temperatures ranging from 41° to 74°, with overnight lows between 31° and 44°. The average high for May is 65° with an average low of 38°. 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 Eureka. See also: June | July | August.
