SAN FRANCISCO (KRON) — We may have moved past summer on the calendar, but hot temperatures are still making an impact. A Heat Advisory in the Bay Area that began at 11 a.m. Thursday was extended until 11 p.m. on Saturday, the National Weather Service announced.

High temperatures will reach into the high 80s and upper 90s across much of the region Friday, NWS Bay Area said on X. The Heat Advisory issued will specifically affect the Bay Area coastline and include San Francisco. The hot air is also expected to stretch south, where the advisory will also impact the Santa Clara Valley, Santa Cruz County, the Monterey Bay coast, Carmel Valley and the Northern Salinas Valley.

Graphic: Kyla Grogan

Daytime highs in these regions will be in the upper 80s to near 100s, well above their average daytime temperatures. Half Moon Bay reached 90 degrees on Thursday, shattering a record set in 2013, weather officials said. Other normally temperate cities along the Pacific coastline, including San Francisco, Santa Cruz and Monterey, are all forecasted to be in the 90s Friday.

Graphic: Kyla Grogan

Inland will receive the brunt of the heat. Santa Rosa, Concord, Livermore and San Jose are expected to reach up to the mid-90s Friday. These regions are also facing a high heat risk, especially for those who are heat sensitive, according to the weather service.

Cooling centers throughout Santa Clara County opened Thursday, Oct. 5, due to the forecasted temperatures. Officials said the county libraries will operate as cooling centers to provide an air-conditioned space. Dedicated cooling centers and libraries can be located using the County of Santa Clara website.