An excessive heat warning has been extended for much of the Bay Area through late Friday night, as a late season heat wave continues to bring hot temperatures to the region, some of which have been record-breaking.

Bay Area residents, on Saturday, sought shelter and relief from high heat. As the first week of October came to an end, most endured 100 degree heat.

With dry, desiccating offshore winds developing in the San Francisco Bay Area during a severe early-autumn heat wave, officials warned Friday that the risk of wildfire sparks and spread is high. The National Weather Service issued a red flag warning just before 11 a.

This weekend the thermometer is expected to soar past 100 degrees in many parts of California, just as it has for much of what has been a record-setting week.