S
M
T
W
T
F
S
30
84°
58°
31
82°
60°
1
80°
62°
2
79°
58°
3
80°
53°
4
79°
59°
5
78°
62°
6
86°
61°
7
87°
62°
8
86°
61°
9
86°
59°
10
80°
60°
11
79°
59°
12
77°
61°
13
84°
55°
14
Hist. Avg.
80°
56°
15
Hist. Avg.
79°
55°
16
Hist. Avg.
79°
55°
17
Hist. Avg.
79°
54°
18
Hist. Avg.
78°
54°
19
Hist. Avg.
78°
54°
20
Hist. Avg.
77°
53°
21
Hist. Avg.
77°
53°
22
Hist. Avg.
76°
52°
23
Hist. Avg.
76°
52°
24
Hist. Avg.
76°
51°
25
Hist. Avg.
75°
51°
26
Hist. Avg.
75°
50°
27
Hist. Avg.
74°
50°
28
Hist. Avg.
74°
50°
29
Hist. Avg.
73°
49°
30
Hist. Avg.
73°
49°
1
Hist. Avg.
73°
48°
2
Hist. Avg.
72°
48°
3
Hist. Avg.
72°
48°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Eureka
Eureka's September 2026 forecast shows daily high temperatures ranging from 77° to 87°, with overnight lows between 53° and 62°. The average high for September is 82° with an average low of 59°. AccuWeather's monthly forecast extends further ahead than any other source, with day-by-day RealFeel® Temperatures giving a complete picture of how September weather will actually feel in Eureka. See also: October | November | December.
