We are having an extra warm spring in Pennsylvania. Can Japanese maples
take direct sunlight this time of year when it gets in the low to mid 80's?

My maple bonsai are out in the sun, & while it hasn't been quite that warm
here, I have had no complaints. It depends a lot on the variety. The thread
leaf Japanese maples are more sensitive. Use Pro-TeKt. it really helps.
Iris,
Central NY, Zone 5a, Sunset Zone 40
"If we see light at the end of the tunnel, It's the light of the oncoming
train."
Robert Lowell (1917-1977)