The answer to that is yes, you can, within
reason. There’s a massive difference between cutting the lawn in a drizzle and
at torrential downpour withstanding water. And you’ll get to know your lawn
and you’ll get to know quite what it can take. Also, you’ll get to know your lawn
mower. Does it collect when the grass is moist or does it leave a mess behind? In
which case, then you’d probably wouldn’t want to cut if the grass is wet.