CPM M4 is much more stain resistant than your typical carbon steel, which is what people in Florida like conditions used for hundreds of years.... You'll be fine. The caveat is that as long as you don't care if something looks slightly less than pristine, and gets the odd spot/blemish. But it's a tool, so I really hope you're fine with that.
I live in slightly more arid California, but my main EDC for years was my CPM M4 Millie. I commute year round by bicycle, in our summers I am instantly sweaty, and my Millie spends all day damp with my sweat since I keep it in my waistband, not pocket. And in winters it spends most days wet from the commute and working outside. It certainly doesn't look new, but it has never affected performance or looked super rusty, even after forgetting about it while damp after camping in my backpack for a few weeks.
Soldiers crossed oceans with high carbon tools. Soldiers and workers spent whole lives in swamps with high carbon tools. A high alloy, nearly stainless steel, like CPM M4 will be just fine in your neck of the woods.
Here is my most recent picture after YEARS of constant carry on sweaty bike rides, sweaty manual labor, beach trips, camping trips, food prep, creek swimming. Still looks great to my eye
When new:
Humidity in California is hugely different from Florida lol. We go from super dry desert areas, to fairly moderate everywhere else. Florida is HIGH humidity.