S
M
T
W
T
F
S
26
64°
44°
27
62°
46°
28
56°
44°
29
63°
44°
30
66°
45°
1
68°
44°
2
65°
45°
3
69°
47°
4
63°
51°
5
64°
49°
6
66°
45°
7
69°
52°
8
71°
54°
9
73°
54°
10
72°
52°
11
75°
56°
12
75°
55°
13
76°
52°
14
67°
48°
15
69°
51°
16
73°
56°
17
78°
58°
18
78°
52°
19
69°
47°
20
67°
47°
21
68°
54°
22
72°
57°
23
76°
58°
24
80°
60°
25
81°
59°
26
78°
55°
27
70°
56°
28
71°
57°
29
73°
60°
30
75°
59°
31
75°
56°
1
75°
52°
2
74°
54°
3
77°
53°
4
76°
55°
5
79°
54°
6
77°
55°
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 81°, with overnight lows between 44° and 60°. The average high for May is 71° with an average low of 52°. 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.
