Huh, we had an outdoor pool with no heating other than just being outside in the sun, and it would regularly get too warm. We would only swim after about 11pm.

Huh, we had an outdoor pool with no heating other than just being outside in the sun, and it would regularly get too warm. We would only swim after about 11pm. We also thought it was too cold to swim if the air temp was below 35C (95F). Australia.