S
M
T
W
T
F
S
26
92°
73°
27
94°
73°
28
92°
72°
29
91°
72°
30
90°
71°
31
88°
70°
1
85°
70°
2
87°
71°
3
90°
71°
4
91°
68°
5
90°
71°
6
88°
70°
7
88°
70°
8
83°
69°
9
84°
68°
10
84°
68°
11
85°
67°
12
87°
70°
13
88°
70°
14
89°
69°
15
90°
71°
16
91°
70°
17
90°
70°
18
91°
69°
19
91°
70°
20
90°
70°
21
81°
58°
22
80°
61°
23
82°
60°
24
81°
62°
25
83°
67°
26
88°
66°
27
89°
67°
28
90°
68°
29
90°
66°
30
89°
59°
31
81°
63°
1
81°
63°
2
88°
66°
3
89°
67°
4
89°
66°
5
88°
60°
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 80° to 94°, with overnight lows between 58° and 73°. The average high for August is 88° with an average low of 68°. 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.
