Weather Hills was the name among Men for the north-south range of hills that lay in central Eriador, specifically between Bree-land and the Hoarwell. The most significant peak was Weathertop/Amon Sûl, lay at the southern end of the range adjacent to the Great East Road.
In the early Second Age the Weather Hills were occupied by Middle Men, as well as the North Downs and Lake Evendim. In the year S.A. 600 Vëantur first returned to Middle-earth from Númenor. Upon hearing that some of their distant kin had come, these Middle Men petitioned Gil-galad to meet the mariners. Twelve men came and rejoiced to meet the Númenóreans.
It marked part of the border between the lands of Arthedain and Rhudaur. When Angmar was formed and Rhudaur became hostile to Arthedain, Argeleb I fortified the range but after the enemies laid siege to the Hills, Argeleb fell (T.A. 1356).
With the help of Cardolan and Lindon, Arveleg I drove out the enemies from the Hills and Arnor kept a guarded border along the Weather Hills, the East Road and the lower Hoarwell.
In T.A. 1409, Angmar and Rhudaur crossed the Hoarwell, occupied Cardolan, and closed in on Weathertop.
Marks of this fortification still existed in the path Aragorn led the hobbits on to reach Weathertop.