... to go in the sea in feb/march

reports say sea temp 19 deg at that time of year which i thought would be warm but another thread suggested it is freezing in may!!

no quite booked our holiday there yet so getting concerned

we will have a heated pool which states it will be 3-5 deg warmer than non heated, does anyone have experience of heated pools out there feb/march time

i have been on 2 hols recently where the pool/ocean is too cold for my little girl to go in and don't want to make the same mistake again.

we are going in low season for many reasons , but at least would like a dip in the pool

thanks for any advice