Today has been a strange day with weather. A lot of sun and humidity, then clouds, then rain. Then a repeat again.
Our phrase for today is "make yourself at home".
This means to make yourself feel comfortable, as if you were at your own home.
Example 1
Please have a seat and make yourself at home.
Example 2
Come on in and make yourself at home. I'll be finished in the kitchen in a minute or two.