There are Apps out there that allow you to plan a trip and then get weather forecasts along the route.  At first glance some of these even appear to be free, but you actually need a subscription for them to work properly, and you only find this out after loading and learning how to use it (the dreaded in App purchase trap)!  AstonOwners provide this service free to our supporters/subscribers using our Driving Weather page

Our subscribers are able to plan a route using Google Maps directions, to which we add the forecast along the route.  You end up with a map like the one below. 

Useful features provided are:

• View a detailed listing of all the forecasts along the route (including weather warnings and snow depth).
• A 7-day forecast is  available for both the start and end locations.  
• Quickly choose the start and end locations from Google's extensive 'Places' database.
• Alternatively, you can choose the start and/or end locations using using our Aston-friendly places database  
• When you have completed your route plan, you can send the directions to your phone's  Google maps App and get the verbal instructions from the nice Google lady....

For a long trip that covers changes in altitude and geography, this is an invaluable service provided free.