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ADVISORY
Release Number: 2026-79
Date: October 2, 2026

Cal/OSHA reminds employers to protect workers amid high heat across California

Temperatures are expected to rise across parts of Northern and Southern California. Southern California will have an extreme heat warning in effect from Friday morning until next Thursday evening. Cal/OSHA reminds employers to implement cool-down areas, rest breaks, and access to drinking water for employees.

The extreme heat warning is in effect throughout Los Angeles and San Diego regions. This also includes Orange County Inland areas and communities such as Orange, Anaheim, Irvine, Mission Viejo, Fullerton, and Garden Grove. Temperatures are expected to range from the mid-90s along the coast to as high as 107 in the valleys during the day. The warning is in effect from Friday, October 2, 10 a.m. until Thursday, October 8 at 8 p.m.

Heat advisory map for southern California.
Source: https://www.weather.gov/sgx/

A heat advisory has also been issued for Northern California, including areas of the East Bay and South Bay, Sonoma coastal range, the San Francisco Bay shoreline, Santa Cruz mountains, and interior Monterey County. Temperatures are expected to be up to 103 degrees Fahrenheit in certain areas. The heat advisory is in effect from 11 a.m. Saturday until 10 p.m. Monday. Separate heat advisories are also in effect from 11 a.m. Saturday for the San Joaquin Valley, with highs up to 103 degrees through 11 p.m. Tuesday, and for the Sacramento Valley, northern San Joaquin Valley, Delta and foothills, with highs of 94 to 100 degrees through 10 p.m. Wednesday.

Heat advisory map for parts of northern and central California.
Source: https://www.weather.gov/mtr

Because weather forecasts are subject to change, employers must remain vigilant, monitor local forecasts and ensure required heat protections remain in place. Visit the National Weather Service website for the latest forecasts and specific areas under heat alerts.

Heat illness is a serious and potentially fatal workplace hazard. Under Cal/OSHA’s Heat Illness Prevention Standards, employers are legally required to protect workers from heat-related illness in both indoor and outdoor workplaces. Employers may be covered by both the indoor and outdoor regulations if they have workers in each setting. See the Comparison Chart of Indoor and Outdoor Heat Illness Prevention Standards for more information.

Cal/OSHA’s Heat Illness Prevention in Indoor Places of Employment regulation applies to most indoor workplaces, such as restaurants, warehouses and manufacturing facilities. When the temperature in an indoor workplace reaches 82 degrees, employers must take steps to protect workers from heat illness. Some of the requirements include providing water, rest, cool-down areas and training.

To prevent heat illness at outdoor worksites, the law requires employers to provide outdoor workers fresh water, access to shade (which must be in place when temperatures exceed 80 degrees) and, whenever requested by a worker, cool-down rest breaks in addition to regular breaks. In certain industries, when the temperature at outdoor worksites reaches or exceeds 95 degrees, Cal/OSHA’s standard requires additional protections. The industries with additional high-heat requirements are agriculture, construction, landscaping, oil and gas extraction and transportation of agricultural products, construction materials or other heavy materials. High-heat procedures include ensuring employees are observed regularly for signs of heat illness and establishing effective communication methods.

Employers in both settings must also maintain a written prevention plan and provide effective training so supervisors and employees can recognize the common signs and symptoms of heat illness and know what to do in an emergency.

Cal/OSHA’s Heat Illness Prevention special emphasis program includes enforcement of the heat standards as well as multilingual outreach and training programs for California’s employers and workers. Details on heat illness prevention requirements, training materials and tools are available on Cal/OSHA’s Heat Illness Prevention web page and at 99calor.org.

Cal/OSHA has established the Heat Illness Prevention (HIP) Network, a voluntary partnership aimed at increasing awareness among employers and workers about the importance of preventing heat illness. To join the HIP Network, email HIPNetwork@dir.ca.gov.

Cal/OSHA helps protect workers from health and safety hazards on the job in almost every workplace in California.

Workers who have questions about safety and health in the workplace can call 833-579-0927 to speak with a live bilingual Cal/OSHA representative between the hours of 9:00 a.m. and 7:00 p.m. Monday through Friday. Complaints about workplace safety and health hazards can be filed confidentially with Cal/OSHA district offices.

Workers in California are protected regardless of immigration status.

Employers who have questions or need assistance with workplace health and safety programs can call Cal/OSHA’s Consultation Services Branch at 800-963-9424.

Cal/OSHA is a division of the California Department of Industrial Relations.

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