S
M
T
W
T
F
S
30
63°
52°
31
64°
55°
1
63°
52°
2
63°
50°
3
65°
49°
4
62°
49°
5
68°
55°
6
69°
55°
7
68°
54°
8
68°
52°
9
Hist. Avg.
64°
51°
10
Hist. Avg.
64°
51°
11
Hist. Avg.
64°
51°
12
Hist. Avg.
64°
51°
13
Hist. Avg.
64°
51°
14
Hist. Avg.
64°
51°
15
Hist. Avg.
64°
51°
16
Hist. Avg.
64°
50°
17
Hist. Avg.
64°
50°
18
Hist. Avg.
64°
50°
19
Hist. Avg.
64°
50°
20
Hist. Avg.
64°
50°
21
Hist. Avg.
64°
50°
22
Hist. Avg.
64°
50°
23
Hist. Avg.
64°
50°
24
Hist. Avg.
64°
50°
25
Hist. Avg.
64°
49°
26
Hist. Avg.
64°
49°
27
Hist. Avg.
64°
49°
28
Hist. Avg.
64°
49°
29
Hist. Avg.
63°
49°
30
Hist. Avg.
63°
49°
1
Hist. Avg.
63°
48°
2
Hist. Avg.
63°
48°
3
Hist. Avg.
63°
48°
Temperature Graph
°F
Avg. Hi
Avg. Lo
Actual Hi
Actual Lo
Forecast Hi
Forecast Lo
*Temporarily Unavailable
September Weather in Arcata
Arcata's September 2026 forecast shows daily high temperatures ranging from 62° to 69°, with overnight lows between 49° and 55°. The average high for September is 65° with an average low of 52°. 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 Arcata. See also: October | November | December.
