Following days of mostly mild summer temperatures in the Bay Area and Sacramento Valley, forecasters say temperatures this week will climb significantly, with the hottest day of the year possible on Thursday or Friday.

Temperatures over the past week have been cooler than normal in the Sacramento Valley and Bay Area, largely due to the influence of the marine layer. This week in both the Sacramento area and the inland portions of the Bay Area, there is widespread moderate to major heat risk expected from Thursday through Saturday, with limited overnight relief, the National Weather Service said in its forecast discussion.

A building dome of high pressure centered in the Four Corners area of the U.S. Southwest will expand westward during the second half of the week, the Weather Service sa

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