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7 Days
14 Days
Weekend
Monthly
Precipitation
Temperature
Wind
Temperature Unit Selection
°Celsius
°Fahrenheit
Monthly Historical Averages
Arcata, CA
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September
Average Temperature
High
19°
Feels 19
Low
10°
Feels 10
Average Precipitation
4 Days
Rain amount
16.5mm
Snow amount
0cm
Content continues below
Daily Historical Averages
September 2026
S
M
T
W
T
F
S
1
2
3
16°
4
17°
5
17°
6
17°
7
18°
8
18°
9
17°
10
17°
11
20°
12
18°
13
19°
14
19°
15
19°
16
20°
17
20°
18
19
20
21
22
23
24
25
26
27
28
29
30
Forecast
Thursday, September 3, 2026
Day
16°
Feels 16
Wind
11 km/h W
Gust
17 km/h
Humidity
82%
P.O.P
60%
Rain
~1 mm
Night
11°
Feels 10
Wind
16 km/h SE
Gust
24 km/h
Humidity
94%
P.O.P
20%
Historical Averages
Sep 3
High
Feels
Low
Feels
Precip Frequency
Total Daylight
Humidity
Historical Averages are based on data recorded from 2000 onwards.