The sun’s going to be out, and it looks to be good through tomorrow evening. If you have anything that needs spraying with Roundup or Weed-b-bon now would be a good time to do that.
Herbicides like Roundup and Weed-b-Gon are what they call systemic killers; the herbicide is absorbed into the leaf and is then sent to the stem where it travels down to the root thus killing the whole plant. So, no leaf (s) no kill.
In order for it to do its job completely it cannot rain for twelve hours. And, make sure you do not walk into the area you have sprayed and then walk out onto your lawn; you will leave dead grass foot prints.
In three days you should start to see the effects of your spraying; spray again anything that looks missed.