Simulated turf81E642-816?Natural grass? stays cooler because:

Simulated turf81E642-816?Evapotranspiration? (water evaporating from soil/plants) cools the air.

Simulated turf81E642-816?Soil acts as a heat sink, absorbing less radiation.

Simulated turf81E642-816?Artificial grass? can get hotter because:

Simulated turf81E642-816?Synthetic fibers absorb and retain heat? (especially dark-colored turf).

Simulated turf81E642-816?No natural cooling mechanism? like live plants.

Simulated turf81E642-816?? ?Data Point:

Simulated turf81E642-816On a ?90°F (32°C) day, artificial turf can reach ?140–160°F (60–71°C)?—hot enough to burn bare feet.