S
M
T
W
T
F
S
26
89°
73°
27
91°
77°
28
84°
76°
29
77°
62°
30
65°
61°
1
62°
53°
2
78°
50°
3
82°
53°
4
83°
57°
5
86°
71°
6
77°
57°
7
72°
53°
8
77°
58°
9
93°
71°
10
85°
65°
11
80°
63°
12
86°
60°
13
93°
62°
14
92°
66°
15
88°
69°
16
90°
72°
17
88°
77°
18
90°
77°
19
86°
70°
20
80°
67°
21
77°
67°
22
82°
67°
23
81°
68°
24
84°
70°
25
83°
69°
26
85°
69°
27
85°
71°
28
86°
70°
29
84°
68°
30
87°
77°
31
87°
71°
1
89°
72°
2
88°
72°
3
85°
69°
4
85°
66°
5
86°
69°
6
87°
73°
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 77° to 90°, with overnight lows between 66° and 77°. The average high for May is 85° with an average low of 70°. 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.
