These are pubs that are only open in the warmer months. Call or check their website before traveling. They may not have the most extensive beer selection but the views and locations make up for that.
Outdoor craft beer bar at the Spiritmuseum. Beers are from the Society for Independent Small Brewers
Omnipollo beer garden in the Humlegården park. And of course, being Omnipollo there is soft serve ice cream.