Barometers can be pretty good for predicting the weather, IF you correct them for changes in altitude, and combine them with other observations like clouds and wind direction etc.
As Bertrand says, you will have to keep a log to see long term trends.
My experience with this is mainly with activities like hiking and seakayaking, where it works pretty good. I think accuracy will be less if you travel bigger distances, like you would on your bike, because you will have bigger changes in the terrain you're travelling through, and local features might have a big influence in the local weather.
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