Can I store gas in containers in same place as bike?

I keep seeing people on the fence about whether or not to keep it in a garage, I have no shed only a patio which gets hit with rain from all angles. Ive kept the bike in my garage for like 2 months and its always had gas in it with no problems. Should I be ok or am I just being paranoid? Its a 2 gallon container. Thanks, for my sanctity of mind too ha.
 
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