Autumn heat wave in San Diego County to cool by Halloween

A La Mesa yard on Dallas Street is spooky galore for Halloween Photo by Chris Stone Times of San Diego The last week of October is bringing the heat as offshore winds and high pressure combine to push the mercury upward through midweek Inland valleys remain under a heat advisory until p m Wednesday according to the National Weather Arrangement Santa Ana winds will create gusty conditions along coastal mountain slopes with localized gusts reaching to mph Wednesday morning the NWS reported The offshore flow will also suppress the marine layer limiting low clouds and fog to areas right along the coast High temperatures Wednesday are expected to reach to near the coast to inland to in the western valleys to in the mountains and to in the deserts Relief from the warmth arrives Thursday afternoon when onshore flow returns ushering cooler air inland by Friday just in time for Halloween The shift will also bring back the region s typical night and morning coastal fog Weekend temperatures are forecast to tick up a scarce degrees before a cooling trend takes hold early next week as the high pressure system weakens meteorologists reported