Mostly Sunny. Oregon State Weather. United States; CA; Siskiyou County; 2242 Yreka. Partly Sunny. Partly Sunny. Todays weather forecast, by the hour and long term. Enter any city, zip or place. The Siskiyou Mountains are a coastal subrange of the Klamath Mountains, and located in northwestern California and southwestern Oregon in the United States.They extend in an arc for approximately 100 miles (160 km) from east of Crescent City, California, northeast along the north side of the Klamath River into Josephine and Jackson counties in Oregon. 2343 Weed. R1 - Chains are required on all vehicles except passenger vehicles and light-duty trucks under 6,000 pounds gross weight and equipped with snow tires on at least two drive wheels. Toggle navigation. Slight chance of rain in the late morning and early Afternoon, then chance of rain and snow late this afternoon. The current weather report for Siskiyou Pass CA, as of 2:56 AM PST TUE DEC 29 2020, has a sky condition of Fair with the visibility of 10.00 miles. It is 26 degrees fahrenheit, or -3 degrees celsius and feels like 21 degrees fahrenheit. Weather forecasts for all towns and cities in Oregon State Be prepared with the most accurate 10-day forecast for Mount Shasta, CA with highs, lows, chance of precipitation from The Weather Channel and Weather.com . Free Long Range Weather Forecast for Siskiyou Mountain Park, Oregon January 2021. Calendar overview of Months Weather Forecast. Nov December 2020 . The barometric pressure is 30.19 - measured by inch of mercury units - and is rising since its last observation. Calendar overview of Months Weather Forecast. 2545 Happy Camp. Free Long Range Weather Forecast for Siskiyou Mountain Park, Oregon. WeatherTAB Siskiyou Mountain Park, Oregon Help °C °F. Toggle navigation. Chains must be carried by vehicles using snow tires. Partly cloudy in the late morning and early afternoon then becoming mostly cloudy. Siskiyou County Weather Forecast. Weather Bureau: (530) 221-5613; Cal Trans: (800) 427-7623; Oregon Roads: (503) 588-2941; Snow Chain Requirements. Partly Sunny. See the forecast as a table or graph. Updated Oregon State weather maps. Snow level 6000 feet this afternoon. Highs in the mid 40s to lower 50s. Hourly weather forecast in Siskiyou for the next 15 days: temperature, precipitation, cloud cover, rain, snow, wind, humidity, pressure, fog, sun, thunder, uv index. Today 21 Dec Western Siskiyou County. The 7 day weather forecast summary for Siskiyou Summit: Over the next 7 days the Siskiyou Summit forecast suggests the average daytime maximum temperature will be around 2°C, with a high for the week of 4°C expected on the afternoon of Sunday 3rd. 2443 Mount Shasta.