Windy is available on the App Store for iPhone. Just make sure that you download the Windy.com one as there is another one just called Windy.app which is less useful.
Windy is great - not only showing predicted cloud through the next 3 days at hourly resolution but also a host of other 'layers'. For example you can use layers such as 'PM2.5' (particulate matter in the atmosphere) to predict seeing and layers such as 'Dew point' to indicate when you might need to worry about dew. All these are available in a map format so that you can see changes approaching your site.
Another thing that may not be well known is that if you download the BOM app then you can set this up for your exact location and it will show predicted cloudy/clear conditions on an hourly basis for the next 3 days. I can't find anywhere on the main BOM site that provides this degree of granularity in both time and space - it is more concerned with regional trends.
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