The Collaborative International Dictionary of English v.0.48:

Westerly \West"er*ly\, a.
   Of or pertaining to the west; toward the west; coming from
   the west; western.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Westerly \West"er*ly\, adv.
   Toward the west; westward.
   [1913 Webster]

WordNet (r) 3.0 (2006):

westerly
    adv 1: toward the west; "we began to steer away westerly"-
           Daniel Defoe
    2: from the west; "the wind blew westerly" [ant: easterly]
    adj 1: of wind; from the west [syn: westerly, western]
    2: moving toward the west; "westbound pioneers" [syn:
       westbound, westerly, westward]
    n 1: the winds from the west that occur in the temperate zones
         of the Earth [syn: prevailing westerly, westerly]