Weather Weather Links Forecasts Arcata's climate is one of modest winters and cool summers peaking at 70 degrees fahrenheit. Annual rainfall averages over 40 inches, with 80 percent occuring during the rainy season October through April. Fast moving storm systems come in off the ocean, making it not uncommon for rain to occur one day, and sun to shine the next. The dry season runs May through September, frequently marked by low clouds and fog in the morning and sunny skies in the afternoon.
Air conditioners are practically unheard of.
More traditional summer temperatures in the 90s and 100s can be experienced by traveling an hour inland to relax on local rivers. NWS Zone Forecast, coast - Redwood Coast, covering Arcata, Eureka, Fortuna and Crescent City. NWS Zone Forecast, interior - North Coast interior, covering Redway, Garbervillle, Willits, and Ukiah. NWS Zone Forecast, Willow Creek - Trinity River, covering Willow Creek,Weaverville and Hayfork. Weather Channel - Five day forecast.