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It's a 99. . . over 10 years old. I wouldn't be surprised if the headlight wasn't the only place with moisture, no matter what make or model.
You can take apart the headlight, remove the moisture, and reseal it. Of if you don't want to take it apart, wrap it in some cheesecloth, throw it in a bag of silica or uncooked rice in a hot, dry place for a week, then reseal the headlight with some high-temp sealer. But this is a good a time as any to take it apart and clean it. I would also check the rubber bulb boot. . . it's usually the first place to leak moisture in.
yea the best way is just to bake open the headlights and then reseal it. You should probably do this anyway to check to make sure the headlights is in good condition, it is a 10 year old car after all.