Chartjs-Charts with previous data appear when hovering the cursor over the chart in Chart.js

I looks like you’re creating new charts within the same canvas each time the data changes. You should better create the chart once only and then update its data.labels, data.datasets.data and options.title each time the data for other cities are available. After all data and options are updated, you need to invoke myChart.update().

Please take a look at the following answers that deal with similar issues:

• https://stackoverflow.com/a/61025107/2358409
• https://stackoverflow.com/a/61576710/2358409