- seasonable - in keeping with the season; "a hard but seasonable frost"; "seasonable clothes"
Antonym: unseasonable
- timely, seasonable, well-timed, well timed - done or happening at the appropriate or proper time; "a timely warning"; "with timely treatment the patient has a good chance of recovery"; "a seasonable time for discussion"; "the book's publication was well timed"
Antonym: inopportune (indirect, via opportune)