(CBS SF) — The National Weather Service has issued a heat advisory in effect  until 9 p.m. tonight for the San Francisco Bay Area and the Monterey Bay Area.

A ridge of high pressure combined with offshore winds will lead to temperatures today above what are normally seen in the area, according to the National Weather Service.

READ MORE: Contractor Who Bribed San Francisco Public Works Director Sentenced to 2 Years in Prison

Temperatures today are expected to be in the mid-80s to mid-90s on the coast and could reach 100 degrees in inland areas.

Temperatures are expected to begin to cool over the weekend, but the National Weather Service is forecasting warm temperatures at least through Saturday.

READ MORE: Warnings About San Francisco Millennium Tower Repair Plans Raised Before Work Began

The advisory was issued just before 9 p.m. on Thursday.

MORE: Your Complete Weather Forecast

MORE NEWS: Video Released of Suspect In Assault Pro-Recall Supporter in San Rafael

© Copyright 2014 by CBS San Francisco and Bay City News Service. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.