S
M
T
W
T
F
S
26
89°
54°
27
90°
52°
28
93°
53°
29
89°
52°
30
90°
55°
31
95°
59°
1
94°
57°
2
85°
53°
3
85°
56°
4
88°
58°
5
91°
56°
6
87°
57°
7
90°
58°
8
88°
53°
9
93°
59°
10
90°
57°
11
87°
56°
12
81°
52°
13
88°
57°
14
90°
56°
15
80°
52°
16
81°
54°
17
88°
55°
18
80°
54°
19
86°
56°
20
89°
56°
21
90°
55°
22
83°
52°
23
85°
55°
24
89°
56°
25
87°
55°
26
81°
55°
27
79°
52°
28
81°
53°
29
84°
54°
30
82°
54°
31
75°
53°
1
75°
53°
2
72°
52°
3
73°
49°
4
72°
47°
5
74°
49°
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 72° to 95°, with overnight lows between 47° and 59°. The average high for August is 85° with an average low of 54°. 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.
