I would spot spray some WBG, we have temps in the mid 70's this week here in Charlotte.

I used a [fill in the brand] weed and feed in April and it did a good job getting rid of the weeds.

In all my years reading lawn forums I've never seen anyone report success with a WnF product. I'm chalking this one up to luck, but I will remember it. If anyone reading this has had success, it would be good to hear from you.

Anyway, with my experience in mind, no, now would not be a good time to apply WnF. In fact, the global answer is "never" is a good time to use it. And I'm smiling at this because you have made it work. Nobody else has any good advice on using it.

I agree with jdo. Spot spray individual weeds with Weed-B-Gone.

Weeds should not be a problem if you are watering and mowing right?
What kind of grass do you have?
How high/low do you mow?
How often do you water?
How long do you water?
How often do you fertilize and with what?
Do you spray any herbicides, fungicides, or insecticides?