It’s beginning to cool off-time to start reducing irrigation run times and/or frequency.
I would recommend running the irrigation much less than normal. At my home, I am already down to running the irrigation once a week. The lawn and landscape look great. If you have an ET system you should be around 25% RUN TIMES.
If you have not adjusted the total run time to a lower amount, do it now. With this cool weather, all you are going to do is waste water and your money. Save your water and money for next summer when you need it.
Keep it green.