would be great to show humidity %
Use-cases will vary widely. For example if I used Brolly for sailing, I'd want wind speed in kts and wind direction as well as dew point, and I'd want a recent timeseries of air pressure to give an idea of the synoptic-scale situation.
Of course these may be far outside your original use-cases. I think when people get a hold of Brolly, they're going to love it immediately, and there will be a flood of feature requests. If that happens, might be good to design the layers needed for diverse customization.
I’m starting to think about dedicated sub pages that cover these use cases, with a single section on the main page that links into it. A sailing based page could definitely work here!
Unfortunately open-meteo doesn't offer this.
So https://weather-sense.leftium.com uses the 60-min forecast from OpenWeather. But you have to specifically request it because the free-tier quota is not as generous. (I think Apple's WeatherKit may also offer this data, but I was unable to get WeatherKit to work at all)
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After that, the wind is important for people who like outdoor activities. For example, Kayak rentals are paused when it gets too windy. On the other hand, kite boarders like it when it's windier.
Even within a niche category like sailing there's a wide range of user needs, for example reporting temperatures in C vs F, or pressure in hPa vs inHg.
Coming from another angle, would it be possible to URL-encode user preferences, so that everyone gets their own bespoke Brolly forecast? There can still be prefab pages for common situations, so that informal and power users are all delighted.
(edit: format)