S
M
T
W
T
F
S
26
49°
33°
27
51°
31°
28
55°
26°
29
61°
29°
30
64°
27°
1
66°
31°
2
69°
34°
3
72°
36°
4
66°
37°
5
59°
38°
6
69°
35°
7
78°
39°
8
79°
39°
9
77°
32°
10
85°
34°
11
88°
46°
12
88°
47°
13
82°
33°
14
79°
38°
15
80°
36°
16
70°
32°
17
55°
26°
18
63°
30°
19
70°
35°
20
77°
37°
21
79°
39°
22
77°
43°
23
79°
40°
24
75°
38°
25
75°
37°
26
81°
46°
27
62°
38°
28
62°
39°
29
63°
43°
30
67°
44°
31
73°
46°
1
75°
47°
2
76°
47°
3
76°
46°
4
75°
45°
5
65°
41°
6
69°
45°
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 55° to 82°, with overnight lows between 26° and 47°. The average high for May is 72° with an average low of 40°. 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.
