Anyone have the appropriate TAF? (Forecast)..
For the OP - If it was down to unforseen fog then it is worth bearing in mind airports generally can’t just turn on Low Vis Ops (i.e. allow auto lands) instantly. There are measures that might have to taken on the ground before Low Vis Ops start, and then usually a need for increased spacing down the approach so as has been said the flow rate drops...and if you arrive just as this is kicking in you might have to look at other options....
That’s one reason why if there is a hint of fog in some airport’s morning forecast flow restrictions are enforced right from the start....then you sit waiting looking at blazing sunshine thinking...........