Wecome to the group! I'm about an hour from you in SoCal desert. Temps are indeed high out here. You need to test, even if the water is clear. Your pond hasn't cycled yet. I wouldn't add any more fish for now, but you do need to start checking ammonia levels. If they get high (above .25ppm), start a 10% water replacement regimen maybe once per day until they drop. Koi get very big, and they will outgrow your pond after several years. Then it will be time to go to an even bigger pond! You might also consider getting some liquid bio lift to seed your pond with beneficial bacteria. I've used Pond Microbe-Lift PL 10PLQ on Amazon. Also, how deep is the pond and how are you aerating? High temperatures cause oxygen to drop.