Most employers do not need to keep a specific workplace temperature under federal Occupational Safety and Health Administration (OSHA) regulations. The new rules require employers to provide heat safety training, cooling areas and water when the indoor temperature reaches 82 degrees.The new regulation applies to most California workplaces where the indoor temperature reaches 82°F or higher (e.g. Excessive heat warning issued for Southern California (September 4, 2024). Please contact your school about site-specific changes to activities and schedules. Excessive heat warning issued for Southern California (September 4, 2024). Please contact your school about site-specific changes to activities and schedules. Are living, learning and working. Lea esta historia en Español. California has sharply cut its enforcement of heatprotection laws for outdoor laborers while extreme heat has intensified in recent years.