As the weather gets warmer and warmer (98F in North Carolina today), make sure to run your hose for a minute before watering. The water can get up to 140F in the hot sun and cause severe scalding injuries to persons and likely damage to fragile plants.
Lars
I use the initial hot water from my hose to clean some of the rock, steeping stones, deck, etc in my yard.
I used a IR thermometer to measure my deck temp the other day (I think the forecast that day was only 102F) and the deck temperature was 165F! I don't know how hot the water is coming out of the hose after sitting in the sun all day, but do know it has been hot enough to kill weeds in my landscaping.