hot summer months, best for watermelon growth, have past.   hope you got some fruit.  next year, try this. buy a medium sized, fine camel haired artists brush, play the bee by lightly brushing off all the ripe powdery pollen on male blooms(with stamen) onto female flowers to pollinate and set them with fruit.  i like to spread a few handfuls of coarse sand under melons to discourage damp rot.  good luck. of course this helps to propagate all flowering fruits and veggies.