Hærfest-mónaþ

According to the Old English Dictionary:

es;

hærfest-mónaþ

m. September, Ælfc. Gr. 9, 18; Som. 9, 54. [Cf. Robt. of Glouc. Þe nexte moneþ afturward, þat heruest moneþ ys, He let clepe aftur hym August ywys. Icel. haust-mánuðr : O. H. Ger. herbist-manoþ : Ger. herbst-monat September.] hærfest-monaþ