Are the Sintra sites open now or are the fires still keeping sites closed? I am planning on being in Sintra 9/22/2022
https://www.parquesdesintra.pt/en/parks-monuments/national-palace-of-sintra/
I only went part way into the process but it seems they are selling tickets for next week
The fire danger has decreased significantly. They only closed the sites for a very few days during the worst of the conditions last month. You should be fine as I’m beginning to see a few forecasts of rain and the temperatures have decreased.