The Royal Horticultural Society (RHS) said that suntanned blades don’t always signal a crisis, though. “In hot summers with little or no rain, lawns can turn brown and stop growing. Although this looks serious, the grass will green up once rain returns,” the society explained.
Article source: https://www.huffingtonpost.co.uk/entry/test-yellow-grass-dead-or-not_uk_6a0adde0e4b0a33000e2b39b