S
M
T
W
T
F
S
26
74°
53°
27
72°
52°
28
74°
53°
29
68°
47°
30
66°
51°
1
67°
51°
2
70°
50°
3
68°
49°
4
72°
50°
5
76°
53°
6
76°
55°
7
77°
56°
8
78°
57°
9
77°
56°
10
74°
52°
11
68°
55°
12
69°
53°
13
75°
57°
14
74°
50°
15
71°
52°
16
74°
54°
17
78°
58°
18
73°
52°
19
74°
51°
20
73°
52°
21
74°
53°
22
73°
52°
23
72°
60°
24
78°
60°
25
79°
61°
26
83°
61°
27
84°
62°
28
83°
63°
29
86°
62°
30
85°
54°
31
77°
55°
1
77°
56°
2
82°
63°
3
85°
61°
4
83°
58°
5
86°
55°
6
78°
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 66° to 86°, with overnight lows between 47° and 63°. The average high for May is 76° with an average low of 55°. 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.
