Early summer is the rainy season in Tokyo. From early June to mid-July there are more rainy days, but it does not rain all the time.
One thing to look forward to during this time of the year are the hydrangea flowers that color the city even during the grayest days. Hydrangeas are called Ajisai in Japanese. They are very popular and you can find them depicted in Japanese art and adorning kimonos and other textiles. If you are in the city during early summer, keep an eye out for these beautiful flowers. You can find Ajisai along Sumida River in Asakusa, the Kyu-Iwasaki-tei Gardens near Ueno, and many smaller gardens of temples and shrines.
Many Japanese people always carry a foldable umbrella. To find your own perfect Japanese umbrella, visit a few shops. Department stores and specialty shops sell a great variety of umbrellas. You can choose different colors, designs, and sizes. Visit Ameyoko Market between Ueno and Okachimachi Station or 2k540 Aki-Oka Artisan under the JR rail tracks between Okachimachi and Akihabara Station. On a rainy day, 2k540 Aki-Oka Artisan is a great place to browse and shop, because it is located under the JR rail tracks.
In an emergency, you can always buy umbrellas and simple raincoats at convenience stores.
Shopping for handmade items in Tokyo at 2k540 AKI-OKA ARTISAN: A hidden street filled with small workshops and boutiques
Shopping for foodies in Tokyo - Ueno’s Ameyoko Market: Sweets, snacks, and everything you need to prepare traditional Japanese dishes & lots of eateries and bars
Shopping in Tokyo without getting wet: Don’t let a little summer rain stop you from exploring Tokyo.
Tokyo travel advice
・Useful Japanese phrases for travelers
・Etiquette tips for first-time travelers
・When you get sick in Japan and require medical care in Japan
・Travel tips: Visiting shrines and temples in Japan
・10 useful sites for planning a (rescheduled) trip to Tokyo