September is a high-fidelity "shoulder season" in Tokyo, offering a mix of late-summer heat and the first hints of autumn. While it is technically the rainiest month of the year and sits at the peak of the typhoon season, it is still an excellent time for budget-conscious travelers to visit. The average daytime temperatures hover around 27°C (81°F), making it much more bearable than the oppressive humidity of August. However, travelers in 2026 should be prepared for the possibility of heavy rain and occasional flight or train disruptions due to tropical storms. On the positive side, crowds at major attractions like the Sensō-ji Temple are thinner, and hotel prices are generally lower than during the cherry blossom or fall foliage peaks. If you don't mind carrying an umbrella and having a flexible itinerary for the 1 or 2 days affected by typhoons, September provides a unique opportunity to experience Tokyo's transition into fall, featuring early-season festivals and the return of a more vibrant, local atmosphere as the summer holidays come to a close.