S
M
T
W
T
F
S
26
55°
28°
27
50°
30°
28
50°
27°
29
57°
23°
30
52°
23°
1
63°
19°
2
75°
32°
3
75°
32°
4
52°
27°
5
45°
23°
6
54°
27°
7
64°
25°
8
72°
34°
9
61°
36°
10
64°
28°
11
82°
41°
12
75°
41°
13
82°
34°
14
79°
52°
15
77°
43°
16
68°
43°
17
48°
43°
18
45°
41°
19
55°
37°
20
70°
37°
21
70°
48°
22
57°
48°
23
70°
48°
24
82°
53°
25
89°
59°
26
87°
61°
27
83°
58°
28
78°
58°
29
74°
53°
30
73°
51°
31
74°
50°
1
78°
55°
2
79°
52°
3
77°
53°
4
77°
52°
5
73°
51°
6
73°
55°
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 70° to 89°, with overnight lows between 48° and 61°. The average high for May is 78° with an average low of 54°. 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.
