Mowing moist grass won’t dull your mower’s blade any faster than dry grass, but it is not good for the yard and makes the mower work harder. Wet grass clippings clump together, creating problems both in the yard and at the mower.
Wet Grass along with Your Mower
Wet grass clippings become stuck underneath the mower deck where they form a thick, soggy mass. The buildup of grass clippings interferes with the vacuum created under the mower which lifts grass blades upwards so that they may be cut. In case it gets thick enough, it will interfere with the blade movement, causing the mower’s engine to bog down and finally shut off when the mass gets large enough. The only way to clean this mess is to flip the mower over and dig it out by hand.
Wet Grass and Your Yard
Wet grass is a lot more likely to get pulled out of the ground as opposed to be cut cleanly — particularly if your mower blade is dull. Grass clippings clump when moist and may be thick enough to stop sunlight from reaching the ground underneath, creating dead spots in the yard. Moist clumps of grass are also likely to boost bacteria and infection. Walking on and running a mower over moist grass bruises grass blades, along with the tires of the mower may compact the soil, restricting the flow of water and air around the roots of the grass.