Regarding brightsky, it uses the DWD (Deutscher Wetter Dienst) data which is already integrated into homeassistant but that one only had ~16 (if I recall correctly) of weather stations so it’s only accurate for certain large cities and not local enough like wetter.com’s who have a station in our neighbour city.
I’ve seen that you can actually request a forecast of your city on the weather_here website (XxXx)
from my observation of the last few days the weather.here sensor isn’t all that accurate for the small village I live in (Bassenheim near Koblenz in Rheinland-Pfalz)
For example it says that it’s 27° right now while it’s actually 29,5-30°(measured with my local sensor). (I put the local sensor 1,5m above ground, not into a spot directly hit by sunlight but at a place close to it)
As usual relatively close forecast is provided by wetter.com with 29°.
openweathermap (owm) is the most inaccurate with 26,7° and a forecast only every 3 hours. (I think I’ve seen met.no being less accurate than owm before as well though)
Darksky (Apple) 27°
AccuWeather (Smartthings) 28° with a felt temperature of 29° (I think there might be others for smartthings too)
Thinking about buying my own weatherstation. Feels like such a waste though. I mean if just 1 person within a couple of miles near you had a station and provided his data online you wouldn’t need loads of people spending 100+€ on it and wasting earths’ resources.