It will be the hottest weekend of the year so far as New Jersey enters its sixth day of the current heat wave, with temperatures on Saturday expected to fall just shy of 100 degrees. And while it’s not expected to be quite as humid, forecasters still predict heat-index temperatures above 100 degrees, according to the National Weather Service. Record highs for July 23 are 102 in Newark, 104 in Trenton and 105 in Atlantic City, all set in 2011. Those numbers aren’t expected to be reached Saturday, with afternoon temperatures projected to top out in the mid to upper 90s. A heat advisory is in eff…