An hourly meteogram for the end of every stage, not one forecast for the whole trip.
A forecast for "Scotland" is useless when your week crosses four valleys and a coast. Weather gives each day its own hourly chart, for the point where that stage actually ends — which is where you will be standing when the rain arrives.
Most planners make you type coordinates. Trip Tracker takes them from the end of the day's GPX track, because that is the overnight stop, and caches the result on the day so it is only worked out once.
Days without a track can have coordinates set by hand, and any day's point can be overridden if you would rather forecast for a summit than a bunkhouse.
A sun icon and one temperature tells you nothing about whether to start at six or wait until nine. The chart stacks the things that change that decision across 48 hours: temperature with feels-like and dew point, precipitation with probability, wind with gusts and direction, and cloud cover split into low, mid and high.
Night hours are shaded, days are separated, and the summary above gives the range, total rainfall, peak gust and daylight hours for the stage itself.
Forecast models disagree, especially in mountains, and most people who ride in bad weather have a favourite. Switch between ECMWF, the UK Met Office, GFS and ICON, or let the service pick the best available for that location.
Disagreement between two models is itself information. If ECMWF and the Met Office differ about Thursday, Thursday is uncertain — worth knowing before you commit to a 90 km day.
Free while in early access. A couple of minutes to set up.