Breezy Weather will effectively run offline. It syncs fairly regularly but if it can't update, it will still show the latest results it got and how long ago it was fetched. You can fully control your weather sources and locations, there's decent widgets, fully open source, can be installed from fdroid or using Obtainium.
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While I use a couple weather apps, I also use Widgetify to grab the NOAA website for my region. This keeps a widget on the home screen with multiple days on it.
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