seasonably

1. In due season; at an opportune or fitting time.
   • 1661, Robert Boyle, The Sceptical Chymist, pages 6–7:

     ...having very long suspended our conference about the freshly mention'd Subject, it was so newly begun when you came in, that we shall scarce need to repeat any thing to acquaint you With what has pass'd betwixt us before your arrival, so that I cannot but look upon it as a fortunate Accident that you should come so seasonably, to be not hearers alone, but we hope Interlocutors at our conference.

   • 1794, Robert Southey, Wat Tyler. A Dramatic Poem. In Three Acts, London: Printed [by J. M‘Creery] for Sherwood, Neely, and Jones, […], published 1817, OCLC 362102 ↗, Act I, page 6 ↗:

     What matters me who wears the crown of France? / Whether a Richard or a Charles possess it? / They reap the glory—they enjoy the spoil— / We pay—we bleed!—The sun would shine as cheerly, / The rains of heaven as seasonably fall, / Tho' neither of these royal pests existed.

2. Varying with the season.
3. In a manner appropriate to the season.
4. (chiefly, legal) Within the appropriate time period during which an action will be legally effective, as prescribed in legislation, a contract, or otherwise.
   • 2005: Uniform Commercial Code § 1-204(3) ↗. The American Law Institute and the National Conference of Commissioners on Uniform State Laws.

     An action is taken "seasonably" when it is taken at or within the time agreed or if no time is agreed at or within a reasonable time.

• French: au temps convenable
• German: zur rechten Zeit
• Spanish: tempestivamente