How bad are pollen allergies in Japan in 2026?

Sugi and hinoki peaks usually run from late winter through spring, arriving earlier in Kyushu and western Honshu than in cooler northern districts. Dry, sunny, windy days after rain push the highest counts: Wind in Japan. Tokyo, Osaka, and Kyoto all feel the season even though trees sit outside the CBD. Grass pollens can stretch into summer, and autumn weeds such as ragweed add a second wave for some people.

Environment Ministry guidance stresses masks, glasses, clothes that shed pollen, and cleaning shoes before entering the flat. Midday and late-afternoon outdoor peaks often hurt more than early morning walks: Outdoor recreation.

Keep windows closed on high-count days, run an air purifier if you have one, and shower after outdoor sport. Pharmacy antihistamines and nasal sprays are widely available; ask a pharmacist when labels are Japanese-first. Yellow dust (kosa) and pollen can overlap in spring, which confuses symptoms: Air quality.

Do not confuse pollen season with summer mold stress inside damp flats: Mold and damp homes. If you shortlist a “sunny” climate for lifestyle reasons, price medication and peak-season outdoor limits into the real fit: Best climate and Summer heat.