as welling as santa claire va ya valley. last night, the bay area started to shrink a little bit.oing to find-x@a mid-20s overnight. and we have a frost advisory posted until 9:00 a.m. tomorrow that, is a light purple shading here then for the bay shore line. lows from low to mid-30s. maybe the last night we see frost advisory. lows tonight 27 santa rosa. nap area, 28. 39 san francisco. 28 degrees overnight>( temperatures. 32 san jose. care of those. high pressure is with us. cold air mass just over the bay area, it will push east tomorrow. get ready for dry, milder temperatures wednesday, thursday, friday. tomorrow, temperatures coming up at four, five degrees. spring time out there. here is a look at numbers for you. santa rosa, 58. you'll finally get into low 50s. 56 for san jose. we'll see 57 degrees for santa cruz. here is a look at the accu-weather forecast. we start to warm things up a bit. sunny, temperatures by saturday and it's compared to what we've had. >> overnight temperatures st'mó to moderatea raise awareness and probably eye brows alameda county shows this ad cam