What's the best way to auto convert a model field values before it is rendered?

I need to store and retrieve temperatures in a model.  I'd like to store all the values in celsius.  However some users prefer to view the value in fahrenheit.

What is the recommended way to setup a model like this?  

Perhaps manually convert the values in the view and on save?

Or is it possible to use python properties in a model for saves, updates and gets? 

Or is some other practice preferred?

class Temp(models.Model):

    user = models.ForeignKey(User, unique=False)

    temperature = models.FloatField(null=True, blank=True)

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