When is it windy, I have this same problem with our OLD Weber gas grill. I don't want to give up this gem as they just don't make 'em like they used to.
The part at fault is some sort of wind protector. It is a small piece of metal which, on my grill, has about 25% rusted out. On normal, non windy days, the grill lights with no problem. I feel your pain. Hope you can locate the part and replace it.
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