pygrib
Python module for reading and writing GRIB (editions 1 and 2) files. GRIB is the World Meterological Organization standard for distributing gridded data. The module is a python interface to the GRIB API C library from the European Centre for Medium-Range Weather Forecasts (ECMWF).
https://jswhit.github.io/pygrib/docs/
Examples
MetPy Mondays `#135 - Reading GRIB files : Unidata Developer's Blog
https://www.unidata.ucar.edu/blogs/developer/entry/metpy-mondays-135-reading-grib
pygribで気象庁のGRIB2ファイルを読む - Qiita
https://qiita.com/kurukuruz/items/6fc0be9efa34a2fd6741