Chilly temperatures, scattered showers, and a sneaker-wave risk along the coast highlight the weekend forecast, with drier weather expected early next week.
Forecast
Halloween: Scattered showers possible across Southern Oregon and Northern California.
Evening Temperatures: 48–52°F in western valleys; 35–43°F east of the Cascades.
Rain Chances: 20–60% across Southern Oregon; 50–70% in Northern California during early evening.
Sunday Morning: Frost and freezing temperatures possible in inland valleys, with lows near 27–38°F.
Oregon Coast: Moderate sneaker-wave risk Sunday evening through Monday afternoon.
Next Week: Drier conditions Sunday through midweek, with rain chances increasing Wednesday and Thursday.
MEDFORD, Ore. — Halloween could bring chilly temperatures and scattered rain showers across Southern Oregon and Northern California, followed by freezing conditions in some inland valleys and an increased risk of dangerous sneaker waves along the Oregon Coast.
The National Weather Service in Medford is forecasting a chance of showers Saturday afternoon and evening, October 31, with the greatest likelihood of rain across Northern California.
Forecasters have also become more confident that light showers could reach the valleys west of the Cascades, including the Medford, Grants Pass, and Roseburg areas.
Halloween Weather: Rain chances and evening temperatures across Southern Oregon and Northern California for October 31, 2026. Graphic: National Weather Service Medford.
For trick-or-treaters heading out between 5 and 8 p.m., temperatures are expected to range from 48 to 52 degrees in the western valleys, with a 30% to 60% chance of rain.
East of the Cascades, including Klamath Falls, Lakeview, and Chemult, temperatures could fall to between 35 and 43 degrees during the same period, with similar rain chances.
Northern California communities, including Yreka, Mount Shasta City, and Alturas, face a 50% to 70% chance of rain during the early evening, with temperatures generally between 42 and 48 degrees.
Along the Oregon Coast, temperatures should remain somewhat milder, ranging from 46 to 52 degrees, with a 20% to 40% chance of showers.
Those heading out for Halloween activities should plan for wet conditions, warm clothing, and temperatures that will continue falling after dark.
Weekend Cooling Trend: Temperatures fall across the region, with frost and freezing conditions possible in several inland valleys through Sunday morning. Graphic: National Weather Service Medford.
COLDER TEMPERATURES THROUGH THE WEEKEND
The cooler weather will continue into Sunday morning, when several inland valleys could experience temperatures near or below freezing.
The National Weather Service expects frost or freezing conditions in portions of the Rogue, Shasta, Scott, and lower Klamath valleys.
Forecast temperatures early Sunday include approximately 27 degrees in Lakeview, 29 degrees in Alturas, and 30 degrees in Klamath Falls. Grants Pass could fall to around 35 degrees, while Medford is forecast to reach approximately 36 degrees.
The cooler conditions could affect sensitive outdoor plants and animals. Residents are encouraged to protect vulnerable vegetation, provide appropriate shelter for animals, and prepare for cold conditions during early-morning outdoor activities.
Oregon Coast Sneaker Wave Risk: A moderate risk of sneaker waves is expected along beaches in Curry, Coos, and Douglas counties from Sunday evening through Monday afternoon. Graphic: National Weather Service Medford.
SNEAKER WAVE RISK INCREASES ALONG OREGON COAST
A separate coastal hazard is expected to develop Sunday evening as long-period ocean swells arrive along the southern Oregon coast.
The National Weather Service forecasts a moderate risk of sneaker waves from Sunday evening, November 1, through Monday afternoon, November 2, along beaches in Curry, Coos, and Douglas counties.
Sneaker waves can unexpectedly surge much farther up beaches than surrounding waves, potentially sweeping people into cold ocean water.
Beachgoers should remain off jetties, rocks, and logs, maintain a safe distance from the surf, and never turn their backs on the ocean.
Anyone who witnesses another person being swept into the water should call 911 rather than attempting a water rescue.
Early November Weather Outlook: Relatively dry conditions are expected through the first half of the week, with rain chances increasing Wednesday and Thursday. Graphic: National Weather Service Medford.
DRY WEATHER EXPECTED EARLY NEXT WEEK
Following the unsettled Halloween weekend, Southern Oregon and Northern California are expected to experience a brief return to relatively dry conditions beginning Sunday.
Forecast precipitation probabilities remain low across much of the region through the first half of next week.
Rain chances could begin increasing again Wednesday and Thursday, particularly along the coast and west of the Cascades.
The National Weather Service cautions that uncertainty remains about the timing and amount of precipitation later next week, with additional details expected as the next weather system approaches.
Residents and travelers can follow updated forecasts and weather alerts from the National Weather Service in Medford as conditions change.
Cover Photo / Cooler Weather Arrives: Pumpkins rest in a field as Southern Oregon and Northern California transition into November. Forecasters expect chilly temperatures, scattered showers, and a brief return to drier conditions early next week. Photo: Kelsie Cabeceiras / Pexels.
Keep Reading
Southern Oregon and Northern California face a cooler, unsettled weekend, with Halloween showers, near-freezing temperatures in inland valleys, and an increased sneaker-wave risk along the Oregon Coast. The National Weather Service expects a brief return to drier conditions before rain chances increase later next week.