well, if you're after the conditions at/above a certain airfield, aviationweather.gov is your go-to. The METAR for an airfield includes wind at surface (useful for a few thousand feet up), and from there you can hit up

For instance, KBAD (barksdale); METAR says winds are calm right now (would usually read something like 012KT24, meaning 12kts from bearing 240). TAF tells you the same data in a forecast format.

But if they're flying at 15k, you'll want to use windtemp and the scroller on the left to see a user-friendly version of the wind/temperature estimates at different altitudes.

all that said, wind is corrected for generally before takeoff when they figure out a navlog (military yolos it sometimes) so you won't see any major deviation in their headings from the course. Practice is absolutely going to include following plates to make instrument takeoff/landings (even in vfr weather), or they might be practicing some procedure, emergencies, or who knows what. Keeping pilots familiar with the plane and keeping the plane familiar with the air is a regular thing.