There is a daily chance of a popup shower or thunderstorm in New Jersey this weekend, but it really is not worth cancelling your outdoor plans in advance.
Wednesday's heat will be less extreme, so Wednesday night's storms will be less violent. But there is still a significant risk of downpours and flooding.
It is hard to call this a "nice" summer day for New Jersey, as the heat index soars into the triple digits, with the threat of damaging winds and flash flooding later too.