How to say "seasonal" in Japanese

• 季節的きせつてき
  na-adjectiveThe direct adjective equivalent of 'seasonal': describes work, demand, or variations that occur in, or rise and fall with, the seasons. Choose this for the ordinary attributive sense.
  その会社かいしゃは社員しゃいんを季節きせつ的てきに採用さいようする。↗

  The company employs new staff seasonally.
• シーズナル
  na-adjective, no-adjectiveThe katakana borrowing of 'seasonal', meaning the same as 季節的; it has a foreign, businesslike flavor and is at home in advertising, marketing, and product copy.
• 季節性きせつせい
  nounEssentially the noun 'seasonality': the property or degree of varying with the seasons, as discussed of sales figures, climate data, or disease. Reach for this when you need the noun rather than the adjective.
• 時期的じきてき
  na-adjectiveReally about timing, not the seasons themselves: it means 'timing-wise' or 'depending on the time', as when discussing whether something is well-timed. Its 'seasonal' sense is loose; seldom the word you want.
• 時々ときどきJLPT N5approx.Common
  no-adjectiveHere only in the sense 'of the season': whatever is in season or fitting for the moment, typically food or produce. It never covers seasonal work or variations, and ordinarily means 'occasionally'.

For 'seasonal' as an adjective use 季節的, or the katakana 「シーズナル」; 季節性 is the noun 'seasonality'; 時期的 is really about timing, and 時々 only means 'of the season'.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

• 季節的きせつてきseasonal
• シーズナルseasonal
• 季節性きせつせいseasonality
• 時期的じきてきtiming-wise
• 時々ときどきseasonal