Do not broadcast widely but rather find the weeds and treat them individually. If you grow a dense mat of turf, weeds will be reduced because of the competition. They normally only become a serious problem when rookies try to mow the grass too short to resemble a putting green. Keep the grass high, two inches at a minimum is a good height. In fact, if you set the lawn mower to its highest setting and leave it there, your grass will instantly look better and be healtheir.
Taller grass shades out the weeds.
I thought I would tell you this before your better half used the Internet to find it out. The last bit of advice is something that will separate the men from the wannabee's. Some truly dedicated low maintenance lawn guys do not water during the heat of the summer. The rest of you will continue to water all summer. What the real lawn guy knows is that when temperatures cool down in the fall and rains increase again, his lawn will green right back up and will look as good as his less dedicated brethren.