I guess the temp in Portugal is perfect this time of season.. I guess you have around 14-18 degrees now? Here in Sweden i have -15 C (5 F) right now
In fact the temperature here today is 3 C (38 F) at night...as you can realize not so warm as you may expect. During the day didn't went above 10 C (50 F). Of course I think the LEAF will accept much better this temperatures in terms of performance compared with your weather. Anyway hope you are able to enjoy your LEAF there in Sweden when you get with the heat Pack of course