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My 98 dos this exact same thing. I use to think this was odd. From the other numerous threads on here about his same issue I have found out our temp gauge is a true gauge and will fluctuate. I did a water pump with a lower thermostat with new fluid flush and it still does it. My radiators are clean after I flushed and cleaned them. You also have a engine compartment fan that kicks on the driver side vent and sucks in cooler air into the compartment. See if you hear it kick on, on hot days. If it doesn't look into replacing the sensor. My fan was blocked by a mud wasp nest and it burnt the fan motor so I had to replace it. As long as it doesn't get to the next white harsh mark for me I don't worry about it.
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