During rain it does allow some water entry into the main body, which then runs down to the grease pan, but it is a small quantity and we can live with it..This was a serious concern for us because it was bought to replace a horror-story brand new grill that ingested so much water (and the factory refused to do anything about it) that it had to be returned to the store.  They were similar in pricing, but I sure do wish we had bought Napoleon in the first place as it will be used every month of the year, rain, snow, sunshine or darkness. 
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Very nice grill.  

I do at least 90% of the BBQ cooking at our house and I am very pleased with it.. .