(KRON) -- Chilly temperatures begin today, persisting into early next week. Light scattered showers are possible today, mostly less than a tenth of an inch. A Dense Fog Advisory is in effect for Sonoma Valley through 9 a.m. A Frost Advisory is in effect for the North Bay Valleys through 9 a.m. ICE denies report that SFUSD student encountered agent on Muni bus A Freeze Watch is in effect for most of the Bay Area starting Saturday at 11 p.m. through Tuesday at 10 a.m.  A Wind Advisory is in effect in the North Bay through 10 a.m. Sunday. Today's highs will be in the 50s but could remain in the 40s in high elevations. Sunrise is at 7:18 a.m. Sunset is at 5:25 p.m.