The National Weather Service has issued an Extreme Heat Warning for 7 counties . Coconino County (lower elevations of the Grand Canyon) will be affected through July 1. Graham, Greenlee, Pima, Pinal, and Gila Counties will be affected through June 30. Maricopa County will be affected June 29-July 1. Daytime highs up to 116°F are expected. Public cooling centers are available in some areas. Stay cool, stay hydrated, and stay informed.