I am not aware of a way to do that with vanilla weewx.
You can get that effect perhaps with the highcharts stuff in the Belchertown skin, but even that would be a little kludgey.
You'd need a more heavyweight graphing engine such as grafana to do that kind of thing, probably over a more heavyweight db such as influxdb.
Here's an example of my grafana dashboard showing 1/10/20 temperature as measured by weewx and saved in grafana...