I think one of my problems is the humidity also. But, I think the sun has, over the years, gotten warmer. Maybe it is me, but I have never had a problem with sunburn or the sun since I am naturally dark skinned (thanks to my Spanish Grandmother) but when I am mowing for more than an hour, if the sun is bright, I can feel it burning especially on my feet. I wear shoes, but my feet feel really hot. I also notice the plants are drying out quicker than before. The new soils for containers just does not hold moisture the way it used to. Also, the fields seem to dry out quicker too. I just think the sun has either come closer to the earth or I am getting too old to be out anymore.
The weather has been a problem for me the past two years.