SAN FRANCISCO (CBS SF) – Last week we were wondering if we would ever be able to put away our winter sweaters and today we got our answer.

“It will be the hottest day of the work week, and the hottest day so far this year,” said KPIX Weather Anchor Roberta Gonzales. “We’ll see 70’s at the beaches, 80’s bayside and 90’s inland with triple digits possible across the tri-valley area.”

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Those numbers are about 11 degrees above normal for the region.

The National Weather Service has issued a heat advisory for most of the Bay Area and Central Valley through 8 p.m. The notice is a reminder for people to stay out of the direct sun and drink plenty of water.

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“It’s a huge ridge of high pressure,” said Gonzales.  “We could top out at 104 degrees out in Brentwood.”

By Tuesday afternoon things cool a bit thanks to a tropical storm moving up from Mexico and potentially bringing Thunder to the Monterey area.

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Get a complete hour-by-hour forecast for your zip code on the Weather Page.