S
M
T
W
T
F
S
26
39°
28°
27
49°
26°
28
59°
26°
29
61°
27°
30
68°
27°
1
70°
29°
2
69°
38°
3
74°
30°
4
56°
41°
5
54°
29°
6
71°
27°
7
73°
39°
8
69°
34°
9
67°
43°
10
71°
38°
11
66°
39°
12
72°
31°
13
64°
41°
14
57°
42°
15
53°
37°
16
50°
35°
17
53°
35°
18
54°
30°
19
60°
38°
20
49°
35°
21
63°
30°
22
69°
34°
23
69°
36°
24
73°
43°
25
76°
42°
26
N/A
27
86°
51°
28
92°
55°
29
89°
54°
30
69°
48°
31
65°
46°
1
71°
47°
2
79°
50°
3
78°
49°
4
83°
52°
5
83°
52°
6
81°
51°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
May Weather in Eureka
Eureka's May 2026 forecast shows daily high temperatures ranging from 65° to 92°, with overnight lows between 46° and 55°. The average high for May is 80° with an average low of 50°. 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.
