It's an afternoon arrival, scheduled time 1650LT according to TAP's site.
Conditions an hour before or after are irrelevant; Sao Paulo weather at this time of year changes all the time. And it's been raining in the afternoon almost every day. They would have been landing almost directly into the sun so if the crew say "glare" one should be inclined to accept that. As for ILS/VOR unserviceable, no idea, perhaps someone on here has recent experience.
Regarding Brazilian vs Portuguese, sorry Krueger, can't buy that. In the first place you would have to dig up a very limited ATC guy who wasn't familiar with the differences, considering there's a flight every day. Secondly, and perhaps someone from TAP might clarify, one would expect communication with a European airline to be conducted in English. If it wasn't, there's a wakeup call in itself. Tapes - assuming they still exist and are compared - will no doubt clear it all up.