Blue sky, Cute woman in Yukata, Maids handing out paper fans.. Akihabara is even better during Summer. There are many cafes and restaurants selling ice cream and other refreshments to keep you cool despite the summer heat. Every Sunday it’s pedestrian street in the main street of Akihabara. It gives you the opportunity to enjoy a less crowded Akihabara experience (with the main street cleared of cars, there is plenty of space!) and you can make stunning photos. Pedestrian street usually starts at 13:00 until 17:00.
Official Akihabara website (in English): http://www.e-akihabara.jp/en/