From Longman Dictionary of Contemporary Englishsoutheasterlysouth‧east‧er‧ly /ˌsaʊθˈiːstəli $ -ər-/ adjective 1 SGtowards or in the southeast Snow will spread to southeasterly regions tonight.2 DNHEMa southeasterly wind comes from the southeast
Examples from the Corpus
southeasterly• The wind will remain a moderate southeasterly.• The rain front is moving in a southeasterly direction. 