Our backyard with St Augustine was starting to get pretty weedy after being away for a few months up until October and I bought a bottle of Spectricide herbicide that's designed for St Augustine grass applications. It's active ingredient is Atrazine which is pretty much the only herbicide you can use on St Augustine that won't damage the grass. I applied the herbicide using the supplied garden hose attachment. I checked around 10 days later and most of the weeds were dead and shriveled up.
I use a weed n feed meant for St Augustine at the end of winter and that helps keep things in check for several months.
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