Looking for a free API to get past weather information

It's not an API, but it seems that you can search and download data on this page of the Ministry of Land, Infrastructure, Transport and the Meteorological Agency.

Home > Various Data & Materials > Search for Past Weather Data
http://www.data.jma.go.jp/obd/stats/etrn/index.php
Home > Various Data & Materials > Past Weather Data & Download
http://www.data.jma.go.jp/gmd/risk/obsdl/index.php

Home > Information > Application > Information Usage Guide
http://www.jma.go.jp/jma/kishou/usage_info/guide_top.html

Also, if you want a quick answer, as many people have commented,
It would be better to write down the background of the question and the detailed conditions of what you want to do and what you want.
Also, anyone can search easily, so please show the results of your own search and
I think it would be good to add information such as which one is close and the conditions do not match.

For example, if you search, you'll find something like this right away.

Summary of where to find commercially available weather data and weather APIs
http://sounansa.net/archives/1326

Summary of weather forecast APIs that can be used for website creation and application development
http://hello-apis.blogspot.jp/2013/03/webapi.html

"However, as you can see on both sites, ""commercial use = charged"" and
" Even if it's not for commercial use, you can publish the services you've created so that they can be used. If individuals use it frequently and it seems to interfere with the supplier's operations, the worst is
Arrest and prosecution may be possible.

A while ago, I went to the library for personal use, but I accessed it every minute
Go and help with your own weak construction and bring down the service
I think it's famous that you've been arrested.

Pay close attention.