S
M
T
W
T
F
S
26
60°
49°
27
58°
47°
28
59°
51°
29
59°
49°
30
58°
50°
1
56°
51°
2
56°
51°
3
56°
50°
4
58°
52°
5
61°
52°
6
58°
52°
7
58°
50°
8
58°
47°
9
58°
53°
10
62°
47°
11
60°
50°
12
62°
52°
13
59°
50°
14
59°
49°
15
58°
48°
16
59°
48°
17
59°
49°
18
57°
48°
19
58°
49°
20
60°
48°
21
57°
46°
22
56°
45°
23
57°
48°
24
59°
50°
25
59°
50°
26
57°
45°
27
56°
46°
28
57°
49°
29
60°
52°
30
64°
53°
31
65°
53°
1
65°
52°
2
64°
53°
3
64°
49°
4
63°
51°
5
60°
49°
6
58°
50°
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 56° to 65°, with overnight lows between 45° and 53°. The average high for May is 60° with an average low of 49°. 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.
