I am planning to travel by train from Frankfurt to Fatima in April and then flying out of Lisbon. Is it possible to do this in 4 days? What will the temperatures be in late Aril.
You can if you hurry. The temperatures will be Celcius.
The Bahn website shows Frankfurt to Fatima as taking over 36 hours, with 3-5 changes. Your choice, but I'd DEFINITELY fly. Look at Bahn for trains and Skyscanner for flights. For past weather you can look at http://www.wunderground.com/, looking at "historical data" and "almanac." Of course, in weather just as in the stock market, "past performance is no guarantee of future behavior."