In southeast Alaska I find for the most part cell coverage from ATT is good enough to get a weather forecast and observations about 70% of the time with marine VHF filling up 25% of the rest. If I can't get anything, I send an inReach text to a friend in Ketchikan for the current forecast if I think it is necessary. I do use a cell amp and have bookmarked the text observations locations and text forecast sites so the amount of data access is kept low. I can generally get the text forecasts and observations when I can't make a voice call.
You do need to modify the forecast by what you see and from current observations.