An unprecedented heat wave for the month of March is continuing to hold strong across the southwestern and western United States. Dozens of March temperature records were broken on Thursday in states including Arizona,

High temperatures for the rest of the week will be in the mid 90s to low-100s, with minimal day-to-day changes.

San Diego County experienced record-breaking temperatures due to an unseasonable heat wave, with several areas breaking records and temperatures expected to remain 9-20 degrees above seasonal averages over the weekend.

Southern California faces a third day of record-breaking temperatures as an unusually strong March heat wave pushes the mercury up to 35 degrees above normal.

The highest March temperature ever recorded in the U.S. happened on March 19 during Arizona's scorching early heat wave. Here's what to know.

The FOX Forecast Center is tracking the most intense March heat wave ever observed in the U.S. which is currently baking the West as it expands farther into the Plains through the weekend.