Is there any place/country on earth where the temperature stays within 15-30 degrees celsius?

I've always seen those temperatures as kind of ideal, definitely not cold and also not too hot. The only places I've been to have often had much more extreme temperature variations over a year, especially my home that easily gets 32 in both directions and sometimes even more than that. I guess this hypothetical place in my question would be close to water atleast, as I know that water has a 'milding' effect.