i mow the lawn in the morning when i know that day will be either really hot or rain is forecast. depending on where the house is situated, choose grass-cutting times that are comfortable for you as far as heat or pollen counts are concerned.
cutting grass in the cool of the morning is better than in the heat of the day. or cut grass at dusk when the sun is not so hot.
sometimes because of a busy schedule, you will find yourself cutting grass at strange times…