An incessant and dangerous heat wave blistering Northern California was peaking Sunday with another round of record-breaking temperatures expected in the Bay Area and Sacramento Valley before gradual cooling begins.

Northern California's heat wave is expected to continue, with a Heat Advisory potentially extending into Monday and cooling predicted for mid-week.

Some cities in Northern California are seeing temperatures in the upper 90s and lower 100s. Temperatures are generally in the mid-80s this time of year.

The month kicked off with triple-digit temperatures in many parts of the state, with millions of Californians under heat advisories through at least Thursday.