It won't happen anytime soon for several reasons. It's still early meteorological summer and we can dry out rapidly, but the only way we hit 100° is with the heat index and even that is unlikely for a week or two.
You have probably heard me on air talking about the refreshing air mass on the way for next week. Temperatures will be below average and humidity levels will drop! That does not happen often this time of year. The pattern is not favorable for any major heat for awhile. I will not go out on a limb and say no major heat this summer in Arkansas. We still have July and August and you know how Arkansas Weather can change.