I was actually in Higashimurayama yesterday because they have a lot of motorcycle shops and I needed to buy a few things. It was absolutely miserable on my bike and even still quite warm in the shops WITH air on. The brief times of 30-40 kph were somewhat helpful, but still a lot of sitting in the sun with little to no wind and not moving. I checked my heartrate when I got back home and it was almost 160 and all I was doing was sitting on a bike in my gear for about ~35 minutes riding back home.