dear belmont..

[Linny]

The grass doesn't dry out at this time of year like it does in July or August. The sun is less warm and the days much shorter.
Also (as I learned from my lawn guy) during the summer most grasses are in growing mode. Their roots are absorbing water and nutrients from the soil to aid fast growth. In October, the growth has slowed and as it does, the roots are taking less water out of the soil.