Sweater weather and rain return to San Antonio this week April 19, 2021 FacebookTwitterEmail 1of3 San Antonio will see sunny skies and cool temps until later this week.William Luther, Staff / StaffShow MoreShow Less 2of3 San Antonio area could see an increase in rain chances by the end of the week.National Weather ServiceShow MoreShow Less 3of3 San Antonio, get outside and enjoy this perfect weather before rain chances increase later this week. Forecasters say well below normal temperatures will continue on Monday with highs only in the lower 70s. You're going to want to grab a sweater in the mornings, which will see lows in the 50s on Tuesday and 40s on Wednesday and Thursday. You can expect sunny skies through Wednesday, according to the National Weather Service.