I just pulled up the 6-day forecast for here & it's showing storms through Sunday, Monday partly cloudy. Temps ranging from low 70's-90.
Personally, I have never minded the rain while at WDW. It thins the crowds out, keeps it cool & generally just doesn't bother me. I don't even use a poncho or anything. Most people do opt for ponchos or umbrellas, but I completely don't understand the people who leave the park at the first sign of a drizzle. It seems a little absurd to me. Many times, the rain stays light or doesn't last too long, so I'd always suggest to give it some time before taking off. Go indoors for a shopping, snack or meal break for a bit & then re-asses the situation.