The warning comes into place at 6pm this evening and continues throughout all of Sunday.
A band of heavy and persistent rain is expected to arrive across western Scotland during Saturday evening, and continue through much of Sunday.
Many places will see 25-50mm of rainfall. However, some places, particularly over hills and mountains, could see peak totals of 100-130mm during this time.
As well as the rain, there will be a period of strong southwesterly winds. Although these are not expected to be overly impactful, they may make travelling conditions more challenging in places.
There is a likelihood of some localised flooding, leading to difficult driving conditions.
And there is a small chance that homes and businesses could be flooded, causing damage to some buildings.