The seventh month of the year by the calendars of Númenor and Middle-earth. In the King's Reckoning of Númenor, Cermië and the preceding month of Nárië were the only months that ran to thirty-one days in length, separated from each other by Loëndë or Midsummer. The later Stewards' Reckoning standardised all of its months to a length of thirty days, and so while Cermië still followed the middle day of the year, it lost its final day.
Cermië was the Quenya name for this month, but the Dúnedain preferred the Sindarin equivalent Cerveth. In other calendars of Middle-earth, the equivalent month in the Shire was known as Afterlithe (Lithe marking the time of Midsummer), and in Bree as Mede. On a modern calendar, Cermië aligned closely with July, or to be precise the period from 23 June to 22 July. In its earlier, slightly longer form by the King's Reckoning, this month would have run to modern 23 July.
Specific months are rarely recorded in annals, but Cermié does appear in the historical of records of Gondor for the year III 1944. In the Cermië of that year, the Haradrim and Wainriders joined forces against Gondor and attacked from both the north and the south. Their approaching forces were first sighted on the ninth day of Cermië and, on the thirteenth day, Gondor'sNorthern Army met a disastrous defeat. KingOndoher and both his sons were slain in that fighting, leaving the South-kingdom defeated and leaderless.
The name Cermië (or its Sindarin equivalent Cerveth) are not explained, nor are there any known Elvish roots that fit well enough to be sure of the name's meaning. Circumstantially, though, there seems to be a connection with the root meaning 'cut'. In combination with the fact that Cermië was a late summer month, an interpretation of something like 'harvest' (or possibly the 'cutting' of hay, given that Cermië was earlier than most other 'harvest' months) seems more than plausible.