Do you bake a lemon meringue pie?

Meringue topping adheres better when the lemon filling is still hot. If your lemon topping is cold when you apply the meringue, the two layers are more likely to separate after the pie is cooked and cooled.

A different answer:

Numerous recipes call for cooling the lemon filling BEFORE putting it into the pie crust, in which case it would be cool, but not chilled, when the meringue is applied.