September weather in Arcata, CA
The average temperature in Arcata in September is 57.2°F (50.5°F–63.9°F). Average precipitation: 0.68 inches.
September is a fall month in Arcata, and is warmer than the annual average of 52.6°F. Daily temperatures swing about 13.4°F between overnight low and afternoon high. Expect about 5 days with precipitation. Daylight averages about 12h 15m. For travel, September is a comfortable month to visit.
Avg High
63.9°F
Avg Low
50.5°F
Precipitation
0.68 in
Daylight
12h 15m