I Planted A Shoal Creek Chaste Tree. The Month Ahead Is All Cloudy Days. This Is A Full Sun Plant. What Do I Do?

Answer 1

It will be fine. There still will be plenty of light. It does need very well draining soil if lots of rain is expected.

Here is more:
https://www.gardeningknowhow.com/ornamental/trees/chaste-tree/chaste-tree-cultivation.htm