Those lows should not hurt them as long as the temps never get below 40. My coco's are still ticking and took many weeks in the low 40's. I would worry more about the rain, and if you put them outside after watering. They do not like there roots wet for pro-longed times, exspecially if soil temps are below 71. They like there roots warm. Are you going to plant it outside, or live them inside? Well either way they would benefit better if they had root heating cables. Also many times they die because of root rot from the cold rain water, I would but some kind of tarp or something to keep the dirt around it from getting wet.

Let me know how it goes

good luck,

I know what you mean. I had to bring my Cuban Royal inside the past two nights. Got down to 41 F last night here on the west side. It has been a very cool Spring! No 80 degree weather in site for the next 10 days here either, but at least no more night time temps below 50 in the forecast.