Cooldown in the forecast this week for Paso Robles– Paso Robles temperatures are expected to cool throughout the week, with highs falling from 91 degrees Monday to 76 degrees Thursday. Monday and Tuesday will be sunny, with highs of 91 and 87 degrees and lows of 59 and 56 degrees. Partly cloudy conditions will begin Wednesday, with a high of 81 and a low of 55. Thursday will bring the coolest daytime temperature of the week, with a high of 76 and a low of 54. Click here to view a 10-day forecast for Paso Robles from Weather Underground.