What Causes Dew On Certain Mornings?

Every walk outside in the morning and see that the grass is all wet, even though it didn't rain? The water comes from the dew that formed overnight. In the night hours, air temperature usually cools down. Everything in nature cools at a different speed, but usually plants don't need a lot of time to drop in temperature. The cooler air around these things causes condensation (water) to form on their surface. This is the dew we see shining on the grass in the early morning hours.