Netherlands in November

Judging by how crowded Amsterdam is all year round, no it would not be too cold.

Would it be too cold all depends on the person. Some people like what you would consider cold weather.

I live in Chicago so Amsterdam never seems cold to me and I've been there in January. Wet weather is worse. Look at the typical rain fall and consider that it gets dark at 5 pm. The airfare is usually cheaper after Thanksgiving.

Look on Wikipedia for "Amsterdam". They have a section on weather with average temperatures (low & high) and average precipitation, etc.
Other months may be more pleasurable that far north.

Was there in Oct a few years ago and it was cold with a brutal wet wind blowing thru valleys of canals and townhouses. Be prepared to layer, take a waterproof coat, hat and gloves.

Like is I said cold depends on where you come from or the person. I don't think hat and gloves in October.
But waterproof light jacket and sweater as needed.

I prefer a website like wunderground that gives you actual historical temps and precipitation for travel dates. I had a long layover in Amsterdam in late November one year. Having come from Africa, it was cold and raw and miserable. Flight arrives early so finding things to do or places to stay warm at 7 a.m. was hard, but it improved through the day. Still damp and raw, but a little warmer. Dressing appropriately is the answer.

Getting dark so early and of course still dark in the morning is IMO worse than rainy weather . Most of the time you'll find the rain clearing at some point during the day . And gloves may be needed in chilly , windy weather !

I’ve been to Amsterdam in late winter and didn’t mind the weather as I was there to see the world class museums. I also liked seeing the beautiful churches and canal houses without foliage from the trees blocking the view.