Yes, it's normal. Nothing to worry about. Whilst it may not be a hot day, maybe you gave it a bit more gas than normal at some point, or maybe the humidity is different, or you spent more time in traffic etc. Either way, the fans (or other pumps etc) can stay on for up to 30 minutes if needed after you lock the car and walk away.
Since you have just clocked up 1000km, it is worth checking the oil and coolant levels when the car is COLD and on a level surface. Refer to the manual, but the oil should hopefully still be on "max" and the coolant level should be in the SHADED area between the "max" and "min" levels.
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