Wēod-mōnaþ, m.n: August; literally “weed-month”. (“weh-ohd-mon-ath”)
And ϸæs symle scriϸ
ymb seofon niht ϸæs sumere gebrihted
Weodmonað on tun, welhwær bringeð
—The Old English Metrical Calendar (Menologium), lines 136b-40a
And then after seven nights, the summer-glorified Weodmonað always comes to town; everywhere August brings to mighty people Lammas Day. (trans. by K. Karasawa)
The Old English Martyrology says that August is called Weodmonað “because [weeds] most greatly grow in this month”.*
*Kazutomo Karasawa, The Old English Metrical Calendar (Menologium) (Cambridge: D. S. Brewer, 2015), p. 111.