Mowing Wet Grass Is Not A Good Idea. Even the best mowers can get clogged up and mulching the clipping becomes nearly impossible. Mowing a steep hillside on a wet day increases the element of danger.
The Most Important Rule: Never Do It when It’s Wet
The best lawn mower to use on an incline has special characteristics. They include:A good rear-wheel-drive to give you better traction on slopes and inclinesA very wide cutting deck to help you cut the grass fast...
Mowing a steep slope can be dangerous if you do not take precautions. Do not mow up and down the hill directly; instead, take a lateral approach, run your mower parallel to the slope. If you can use a self-propelled mower, the better!