UPDATE: Extreme heat warning issued for Shasta Cascade from Sunday to Tuesday

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At 12:35 p.m. on Friday, the NWS Sacramento CA issued an updated extreme heat warning valid from Sunday 11 a.m. until Tuesday 11 p.m. The warning is for Western Shasta County Foothills Between 1000-3000 ft, South-Central Shasta County Including Redding Metro, Sierra Nevada of Tehama-Butte-Plumas counties Between 1000-3000 ft, Western Tehama County Foothills Between 1000-3000 ft, Northern Sacramento Valley in Tehama County and Butte County Below 1000 ft.

"Dangerously hot conditions with temperatures up to 110 degrees expected with widespread Major HeatRisk," says the NWS. "Hot daytime temperatures will occur in other Valley locations as well, though Delta breeze influence will better moderate local temperatures in the remainder of the Valley."

"Hot temperatures may cause heat illnesses, especially in those more sensitive to heat," adds the NWS.

This warning is in effect until Tuesday at 11 p.m.

Ways to stay safe in the heat according to the NWS

• Consume plenty of fluids to stay hydrated.
• Seek cool shelter: Opt for an air-conditioned room to stay comfortable.
• Look out for others: Stay out of the sun, and check up on relatives and neighbors.
• Child and pet safety: Never leave young children and pets unattended in vehicles, especially when car interiors can reach lethal temperatures within minutes.
• Be cautious outdoors: Take extra precautions if you work or spend time outside.
• Find the right time: Consider rescheduling strenuous activities to early morning or evening if possible.
• Be alert to warning signs: Educate yourself about the signs and symptoms of heat exhaustion and heat stroke.
• Dress appropriately: Wear lightweight, loose-fitting clothing to stay comfortable.

To reduce risk during outdoor work, the Occupational Safety and Health Administration (OSHA) recommends scheduling frequent rest breaks in shaded or air-conditioned environments. Anyone overcome by heat should be moved to a cool and shaded location. In an emergency, call 911.

Source: The National Weather Service

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This story was originally published June 12, 2026 at 12:20 PM.