S
M
T
W
T
F
S
26
52°
30°
27
53°
37°
28
49°
30°
29
49°
27°
30
50°
28°
1
50°
38°
2
52°
37°
3
53°
33°
4
54°
37°
5
51°
39°
6
37°
18°
7
38°
24°
8
37°
28°
9
38°
28°
10
37°
27°
11
43°
25°
12
46°
30°
13
55°
40°
14
53°
36°
15
62°
36°
16
60°
40°
17
64°
42°
18
63°
41°
19
64°
42°
20
51°
33°
21
49°
27°
22
48°
27°
23
48°
28°
24
49°
28°
25
49°
29°
26
50°
32°
27
50°
32°
28
51°
31°
29
51°
31°
30
52°
32°
31
52°
30°
1
51°
31°
2
52°
32°
3
54°
32°
4
55°
34°
5
55°
37°
6
54°
38°
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 37° to 64°, with overnight lows between 18° and 42°. The average high for May is 51° with an average low of 32°. 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.
