Why not? The fall season is upon us and after that comes winter. The last thing you want to do is try and change it in the heart of the winter when it is bitter cold. So let’s do the math. If you change it NOW, the next change would be due in late December to mid January while the weather and temperature is still manageable. After that comes the spring change—April to early May.
If you wait another month from now to change the water, the following change falls smack dab in the middle of February. Can you say five below zero! Plan now to avoid the February cold and freeze.
A little advance planning will allow you to enjoy the tub in water that still is fresh and balanced. –Max