S
M
T
W
T
F
S
26
68°
56°
27
67°
57°
28
69°
59°
29
67°
58°
30
67°
56°
31
68°
56°
1
69°
55°
2
67°
51°
3
68°
49°
4
66°
51°
5
65°
52°
6
63°
53°
7
61°
53°
8
64°
50°
9
63°
50°
10
65°
51°
11
64°
52°
12
65°
52°
13
61°
54°
14
62°
53°
15
61°
53°
16
62°
52°
17
60°
52°
18
59°
53°
19
61°
54°
20
61°
53°
21
63°
54°
22
62°
53°
23
63°
53°
24
61°
55°
25
62°
52°
26
65°
55°
27
64°
52°
28
64°
54°
29
65°
54°
30
65°
55°
31
66°
55°
1
66°
54°
2
64°
53°
3
66°
55°
4
67°
55°
5
66°
54°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
August Weather in Eureka
Eureka's August 2026 forecast shows daily high temperatures ranging from 59° to 67°, with overnight lows between 50° and 55°. The average high for August is 63° with an average low of 53°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how August weather will actually feel in Eureka. See also: September | October | November.
