Your SoCal weather report for Wednesday, July 3: Heat wave in full swing into next week

Beware the heat wave. Stay hydrated and stay cool.

The hottest areas will be the deserts and inland areas including the valleys today. High desert temperatures will rise to 110 degrees, up to 119 degrees for the low desert.

The Inland Empire and western San Fernando Valley will see highs up to 103 degrees, up to 100 degrees in Santa Clarita valley. Meanwhile it will be in the upper 90s for the San Gabriel Valley, mid to upper 80s for inland Orange County.

Coastal areas will continue to be the coolest — highs in the 70s along the beaches, mid 80s for the inland coast.

Tonight's lows will drop to upper 60s, low 80s for low desert, and 70s for the high desert.

About those heat warnings

Most of L.A. County valleys are under an excessive heat warning until Monday evening. The inland coast for L.A. and Orange county — that includes cities such as downtown L.A., Irvine, including the Santa Ana foothills — are under a heat advisory until Sunday night as temperatures will reach up to 105 degrees.

Forecasters say the excessive heat warning for the Inland Empire and the deserts could end by Saturday night.

A fire weather watch for the I-5 corridor starts Thursday evening through Friday due to high temperatures and low humidity. Please be responsible when celebrating Fourth of July.

This day in history

On this day in 1969, John Wayne won Best Actor for True Grit — his first Oscar after 200 films.

Things to do

• 3rd of July Celebration: Can’t wait 'til the 4th to get your fireworks on? Head down to Orange for the city’s 29th annual 3rd of July celebration, where there will be evening fireworks, food trucks, and a performance by the Orange Community Master Chorale.

Check out our full list of things to do this week.