Strange yellowing/brown spots in normally healthy well irrigated lawn. See pictures. Thx in advance.
Hennepin County Minnesota lawns and turf
If cool season grasses are part of the lawn mix those will be dying off because of the heat. The resolution of the photos is not good enough to see if there are any signs of a fungal problem. The patches are not really big enough for grubs to be suspected as the cause. https://hort.extension.wisc.edu/articles/lawn-disease-quick-reference/