Ahuimanu is located on the windward side of the island of Oahu. In Hawaiian ʻahui-manu means "cluster of birds".

Ahuimanu is spread out beneath the steep windward pali (cliff face) of the Koolau mountain and separated by a low ridge from Heeia Kea. Thus, this area is mostly inland and not directly on Kaneohe Bay. However, one neighborhood spreads over the ridge and along Kamehameha Highway where there is private access to the bay shore. Proximity to the pali gives the place a generally wet climate. Wikipedia