For astrophotography, google maps as above helps find a site while switching to street view will give you an idea of the obstructions the might affect line of site, especially if you're after a target low on the horizon.
Also weather is a big factor so I consult meteoblue and you can change its url with precise gps co-ordinates for your location to see what time is optimal. eg
https://www.meteoblue.com/en/weather...07N149.063407E
Meteoblue has been spot on for me every time. It doesnt just give you the same forecast info for the closest weather station. it does seem to really take into account the surrounding stations to give a fairly precise forecast for a precise location.