How cold will it get in Ecuador at night during july?

I will be backpacking through ecuador and therefore will be carrying limited supplies with me. I was wondering if it was worth bringing a down puffy winter jacket with me since many parts of ecuador are high altitude and it might get cold? Otherwise I would just stick with a sweatshirt. I will be going on hikes, but certainly have no interest in going to any icy areas. I plan on visitng all of ecuadors main regions. If it doesnt get terribly cold then it would be ideal not have to bring my puffy jacket since it is just one extra piece of gear I dont want to carry with me.