Extend the weather command to forecasts

It would be really useful if, in addition to showing the current weather, you could ask for a certain unit of time in advance and get the forecast of that time. It would even be even cooler, if you could do something like...

weather (location) (some time in the future) (frequency of forecast)

and maybe it would be able to give the weather forecast in increments of time from now until the specified date. That might be overdoing it because I don't necessarily know where that data would come from, but at least the forecasting would be a great addition.