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First, remember that broadleaf weed killers are very damaging to St. Augustine lawns and other grasses in summer.
Plus, if you use too much, they can damage your others plants if they drift over or wash onto them.
You should be extremely cautious any time you use this sort of product, though ideally, you would not ever use it. But if you simply must, do not apply when the temperature is over 85°.
The best thing to do is build your soil and lawn health to get a denser lawn that shades out or chokes out 90% of those broadleaf weeds, and even grassy weeds.
Mow high, water deeply but infrequently, and fertilize properly. Hand pull weeds as you see them come up and you'll soon be past the problem.
In the fall you can apply a pre-emergent against winter germinating weeds. By now, warm season weeds have sprouted, so the best thing to do is hand pull them.