S
M
T
W
T
F
S
26
77°
56°
27
78°
57°
28
78°
61°
29
79°
62°
30
81°
64°
31
82°
64°
1
86°
62°
2
86°
64°
3
85°
64°
4
85°
56°
5
80°
55°
6
76°
54°
7
76°
54°
8
77°
55°
9
78°
55°
10
78°
59°
11
81°
61°
12
80°
62°
13
83°
63°
14
84°
62°
15
85°
58°
16
84°
55°
17
78°
55°
18
77°
54°
19
77°
55°
20
78°
57°
21
77°
58°
22
76°
55°
23
78°
59°
24
81°
61°
25
78°
53°
26
80°
54°
27
76°
56°
28
76°
62°
29
83°
61°
30
82°
62°
31
82°
59°
1
81°
60°
2
80°
58°
3
81°
56°
4
74°
58°
5
81°
58°
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 74° to 86°, with overnight lows between 53° and 64°. The average high for August is 80° with an average low of 58°. 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.
