Dominican Republic in August, weather and location . . .?

Question

I went to find out about a holiday to the Dominican Republic in August for my husband, five year old son and I. The travel agent tried to talk me out of it because the weather would be so awful, but I'm not convinced its as bad as she said. Has anyone been in August? If so, what was the weather like when you went?

Is it better to go to the North or the South of the island at that time of year?

Thanks!