We were never allowed to mow wet grass growing up. Two main reasons
were clogging and that the wetness caused the blade of grass to "slip"
off the blade rather than cutting the grass. It left you with a more
unkempt lawn as some blades would be cut and others weren't.

That said, I live in Western NY and rain or shine, the office parks
around here have their lawns mowed by the larger riding mowers. After
they have passed by my window, the lawn looks like it was hardly
touched. I've seen them mow in a driving rain.

Seems to me, if I were the landlord, I wouldn't pay to have them mow
on that day. Skip the week and come back the next.

Any thoughts on mowing with riding mowers when its raining?

Charles