S
M
T
W
T
F
S
26
70°
59°
27
73°
52°
28
60°
44°
29
62°
41°
30
65°
39°
1
67°
40°
2
65°
38°
3
83°
47°
4
83°
54°
5
56°
45°
6
60°
44°
7
72°
42°
8
71°
51°
9
83°
50°
10
69°
48°
11
79°
45°
12
84°
51°
13
78°
49°
14
82°
55°
15
88°
65°
16
88°
62°
17
86°
66°
18
87°
57°
19
58°
51°
20
65°
50°
21
64°
56°
22
76°
60°
23
74°
54°
24
81°
48°
25
83°
55°
26
83°
61°
27
81°
64°
28
74°
64°
29
77°
62°
30
80°
62°
31
79°
59°
1
78°
56°
2
80°
57°
3
81°
60°
4
79°
58°
5
85°
62°
6
87°
64°
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 74° to 87°, with overnight lows between 56° and 64°. The average high for May is 80° with an average low of 61°. 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.
