Dew on grass in the morning is a sign of what?

Dew on grass in the morning is an indicator of clear, calm, and cool conditions during the night. When humidity is high and the temperatures drop, moisture in the air condenses and forms dew. This typically occurs when there is little to no wind and clear skies, allowing the ground and plants to cool down enough for moisture to condense on surfaces.

The presence of dew suggests that the atmosphere is stable. Hence, it is a sign that fair weather is likely to continue throughout the day. In contrast, rain later in the day often corresponds with cloudy skies, which would inhibit dew formation. Additionally, the arrival of cold temperatures or high winds would typically disrupt the calm conditions necessary for dew to form.