Japan Weather in September — Cooling Down, Typhoons & Travel Tips (2026)
Complete guide to Japan weather in September 2026. Temperatures start dropping, typhoon season peaks, shoulder season prices, what to pack, and budget travel tips.
September is Japan's transition from summer to autumn — still warm but gradually cooling, with a mix of lingering humidity and increasingly pleasant days. It's also peak typhoon season, which keeps tourist numbers down and prices low, making it a great shoulder-season value.
Use our Japan Trip Cost Calculator to plan your September budget.
Temperatures by City
| City | Average High | Average Low | Conditions |
|---|---|---|---|
| Tokyo | 27°C (81°F) | 20°C (68°F) | Warm, decreasing humidity |
| Osaka | 29°C (84°F) | 21°C (70°F) | Warm, humid early month |
| Kyoto | 29°C (84°F) | 20°C (68°F) | Warm, getting pleasant |
| Sapporo | 22°C (72°F) | 14°C (57°F) | Cool, comfortable |
| Okinawa | 31°C (88°F) | 26°C (79°F) | Still hot, typhoon risk |
Rain, Snow & Humidity
September is one of Tokyo's rainiest months — about 12 rainy days, partly due to typhoons and autumn rain fronts (akisame). Humidity gradually decreases from 75% to about 65% by month's end.
Typhoon peak: September is statistically the most active month for typhoons affecting Japan. While direct hits on major cities are uncommon, they can cause flight cancellations, train suspensions, and heavy rain. Travel insurance with trip interruption coverage is strongly recommended.
What to Wear & Pack
- Light summer clothes: Still warm enough for T-shirts and shorts, especially early September
- Light jacket or cardigan: Evenings get cooler by late September
- Rain gear: Good umbrella and lightweight waterproof jacket — more important than in summer
- Layers for late September: Mornings can be 18–20°C — bring a light sweater
- Comfortable walking shoes: Waterproof recommended given higher rainfall
Travel Tips for September
- Silver Week (mid-Sep): A mini holiday period around Respect for the Aged Day and Autumnal Equinox Day. Domestic travel spikes for a few days.
- Typhoon planning: Have flexible itineraries. Don't plan critical activities on a single day. Book refundable hotels/flights when possible.
- Late September sweet spot: By the last week, heat subsides, rain decreases, and the first hints of autumn color appear in Hokkaido.
- Hokkaido autumn: Fall foliage begins in Daisetsuzan National Park as early as mid-September — Japan's earliest autumn colors.
Events & Festivals
- Kishiwada Danjiri Festival (mid-Sep): Massive wooden floats are raced through narrow streets in Osaka at breakneck speed. Thrilling and slightly dangerous.
- Tsukimi (Moon Viewing): Traditional autumn moon viewing with dango (rice dumplings). Temples and gardens host special events.
- Respect for the Aged Day (3rd Mon): National holiday.
- Autumn Equinox Day (Sep 23): National holiday. Temple visits and early autumn outings.
Cost Considerations
- Flights: 10–15% below average. Good deals as summer travel demand drops.
- Hotels: Normal to low pricing (except Silver Week).
- Overall value: September offers excellent bang for your buck — similar to June as a budget month.
- Budget daily estimate: ¥8,000–12,000/day
September is a smart choice for budget travelers willing to accept some typhoon risk. See our flight cost breakdown and money-saving tips for more.