Summer in Tokyo is extremely hot and we avoid going out for a long time during the day. If you are doing that, you should carry a bottle of water to avoid getting heatstroke. UNIQLO's product AIRISM is very comfortable wear. I am not sure if you can find in your country but you can find in any UN...
You should participate in Hub Japan's BE A LOCAL service! :)https://hubjapan.io/experiences/J_gTnUKPL9-CfYcrxT09LQ
Hub Japan offers plans to interact with locals at "BE A LOCAL" service! Such as this one:https://hubjapan.io/experiences/fWQ4oShemdB8NvCoYsmwoAMore plans are listed here:https://hubjapan.io/experiencesOr maybe "meetup.com"?