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Spring (Mar–May)
Light layers — mornings are cool, afternoons warm. A compact umbrella is essential. Comfortable walking shoes. Book hanami parks early — Shinjuku Gyoen charges entry (¥500) but is worth it.
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Summer (Jun–Aug)
Breathable, light clothing. Hand fan (sensu) — buy one at any 100-yen shop. High-SPF sunscreen. Electrolyte drinks. Start sightseeing early (7–10am) before peak heat. Afternoon: museums, malls, indoor attractions.
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Autumn (Sep–Nov)
Light jacket from October. Layering works well — warm afternoons, cooler evenings. Perfect for walking days. No special gear needed; just comfortable shoes for all that pavement.
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Winter (Dec–Feb)
Warm coat, hat and gloves for nights. Most buildings are well-heated so layering helps. Tokyo rarely gets heavy snow but it's possible in January. Hand warmers (kairo) from any konbini — a revelation.