Boca Raton residents should prepare for a sustained stretch of intense midsummer heat and routine precipitation from Wednesday, Aug. 12 through Wednesday, Aug. 19. Daily high temperatures will consistently reach into the mid-90s, while high ambient humidity drives real-feel indices past 110 degrees on most days. Sunshine will be mixed with a 55% chance of afternoon thunderstorms and an extreme UV index of 11.0. Sunshine will be mixed with a 55% chance of afternoon thunderstorms and an extreme UV index of 11.0. Partial sunshine will dominate the morning before a 55 percent chance of afternoon spot thunderstorms resumes, accompanied once again by extreme 11.0 UV radiation.