mondonalds- Welcome to Autopia!
The weather will just make the paint cure/outgas a little slower than it would in hot weather. I've had lots of paintwork done in cool/damp weather and it's not a problem.
For the first 2 months or so (while the paint cures/outgasses) use something that's fresh-paint-friendly such as
Meguiar's #3/#5/#7/#81/Deep Crystal Step #2, Mothers Glaze, or 3M's Imperial Hand Glaze. Don't use a wax or sealant or the paint won't cure right and thus will not attain optimal hardness.