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2007 Forester 2.5x SE
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I have experienced something similar with my old Car. That was when the coolant was low in the engine.

I think what is happening is the Thermostat reading the air vapor temperature. The air heats up really quickly then cools down really quickly when the fan kicks in, even if the actual liquid coolant temp is being maintained.

If I remember correctly I replaced the Radiator cap to fix the problem. Also check the level of the coolant in the Radiator (once the car has cooled down). You should be able to see the coolant level right near the top of the Rad. If you can not see the coolant try topping it up here, as well as the overflow. There should be very little air in the cooling system.
 
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