It's HOT in Calabasas in the summer and there's no air to breath -- it's just polluted, hot, and dry. So Kylie Jenner's gonna ditch her $13M pad and head to the beach with baby daddy Travis Scott and daughter Stormi and stay in her new luxury Malibu rental!

Ky's plopping down a cool $450K/month to rent Gigi and Bella Hadid's old home up on a Malibu bluff, overlooking Carbon Beach -- appropriately named "Billionaires' Beach." Kylie should fit right in ...

The home is 11,622 sq ft and is valued at $19 million. The nine-bedroom manse sits on 3.3 acres and was completed in 2009.

Ky's a seasoned real estate connoisseur -- she owns FIVE homes of her own, in fact! Maybe if she likes this one enough, she'll make an offer! See ALL the beautiful pix of this stunning estate below ...