Assuming you have a grass lawn, you wouldn’t want to spray roundup on a yard regardless as it would kill your grass also and potentially any non weed plants as well. There are other herbicides that grasses can tolerate though. In any cases, whatever you use is probably not a cause for concern if you’re following the label directions.

Here in eastern Canada weeds are not a problem everything died from lack of water and two months of 30C temperatures.

I'm in the same situation, I don't fancy breaking my back weeding by hand or hoe