Portugal in December

We were there last winter, expect cold, wind and rain.
Floods were particularly bad.

Thanks. I dont mind chilly and rainy. Was it tolerable? Were you able to tour the cities?

For us it was okay because we are from North America - snow ,ice and below zero temperatures.
We actually found the temperatures great for walking because we never overheated but the buildings get cold and we needed the heat on at night.
The rain makes the sidewalks very slippery.
The floods don't happen every winter, hopefully they don't happen again.

For Lisbon in December think San Francisco. Daytime high temperatures in low 60s with rain off and on. For Porto think Seattle. A little cooler with more persistent rain. Dress appropriately and you will be fine!

I was in Lisbon for six days in December 2021 (Dec. 18-24, to be exact). I had two absolutely gorgeous days -- 65 and sunny -- and four days with rain part of the time and temps in the high 50s. It is definitely the rainy season but you can also luck out, and it will likely not be as flooded with tourists as other times of the year. It can definitely be "cold" depending on your definition, but it certainly won't be anywhere near freezing.

We were in Lisbon first week December 2022. It absolutely poured for a couple of days (we are from the wet coast of British Columbia but this rain event was ‘special’!!!). Other days were cool and overcast and drizzly. Not a great time to visit if you want to spend time outside walking etc but probably ok if you are indoors mostly. We left Lisbon a week earlier than planned cause of the weather!