Not much, not enough to be an issue. Husqvarna has been using those vented caps on a variety of applications for a little over 20 years. Inside the cap is a sintered brass vent insert and it doesn't allow much fluid through it.
I have the trimmer version that has lived on the mower trailer all it’s life and never had a problem. If you are really worried about it have a local awning company make you a waterproof bag to go over it.
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