New Jerseyans should enjoy this nice stretch of warm, dry weather, because forecasters say waves of rain showers could spoil the upcoming weekend. Unlike last weekend — which was chilly, windy and extremely wet across most of the Garden State — the upcoming weekend is expected to feature warmer temperatures that are more typical of May, with highs reaching the low to mid-70s in many areas and making a run for the upper 70s in others. ALSO: Lunar eclipse to turn May full moon into a blood moon. When to see it.But forecasters from the National Weather Service say the warm temperatures will be ac…