S
M
T
W
T
F
S
26
88°
59°
27
87°
58°
28
86°
58°
29
86°
57°
30
83°
54°
31
83°
55°
1
84°
52°
2
83°
52°
3
83°
53°
4
84°
54°
5
84°
56°
6
86°
58°
7
89°
59°
8
89°
55°
9
88°
57°
10
90°
59°
11
89°
55°
12
81°
53°
13
79°
52°
14
80°
54°
15
82°
54°
16
82°
57°
17
83°
56°
18
81°
52°
19
79°
55°
20
80°
53°
21
80°
53°
22
79°
50°
23
81°
52°
24
82°
53°
25
83°
51°
26
81°
47°
27
75°
47°
28
77°
46°
29
78°
47°
30
77°
46°
31
77°
46°
1
78°
47°
2
78°
50°
3
78°
45°
4
76°
48°
5
82°
51°
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 75° to 90°, with overnight lows between 45° and 59°. The average high for August is 82° 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.
