Hi Dawna,
Average highs in mid-April are in the low 80s with the average morning low in the upper 50s to around 60.
But realistically, there is still enough variance in mid-April that you could get a day or two with a high around 70, or a day or two near 90. And there could still be some mornings in the upper 40s in mid-April.
Enjoy your trip,
Bob