Hi!
I've been in Paris the past few days and weather.com has been very accurate.
For example, it rained off and on today when we made a trek to DLP today. The temp forecast and rain forecast was accurate (cold and dreary). On the plus side, the crowds were super low today. Didn't wait longer than 15 minutes for anything. Longest line we saw was 25 minutes for Star Tours. We skipped it but could've gotten a Fastpass with a return time within an hour.
I only know Fahrenheit, so it was 45 today, cold, dreary and I was wearing a heavy pullover sweater and a jacket. I wish I had gloves and a scarf. The umbrella was a life saver.
And, remember. A rainy day at Disney beats a sunny day at home...