In meteorology, haar is a coastal fog. Haar is typically formed over the sea and is brought to land by wind advection.
The term haar is used along certain lands bordering the North Sea, primarily eastern Scotland. Variants of the Scots term include har, hare, harl, harr, hoar and the origin may be Low German/Middle Dutch hare or Saxon. In north-east England it is commonly referred to as a sea fret.