Uh oh, Cheryl. This is a "new little lemon tree", huh? Hmm, you're not gonna like what I'm going to say now. If you have just planted this tree in the ground, you really should remove all the fruit the first year to let it establish a good root system.
If you're growing it in a pot, you can ignore that advice. It's not only in response to higher temps that you need to water more, but to give the tree enough water to size up the fruit, too. You'll know if you watered it enough when the lemons get ripe. When you cut them open they have little or no juice, just grainy, dry segments if it didn't get enough.
