Rain changes the setting in which many people drink coffee: outdoor activity slows down, a room becomes quieter, and a warm cup receives more attention. The source connects that experience with weather and sensory perception. It is more useful to treat the idea as an invitation to observe than as proof that rain makes every coffee objectively more aromatic.
Compare what you actually notice. Smell the dry grounds, the freshly brewed cup and the coffee after it has cooled slightly. Use familiar words for the differences rather than assuming an expected rainy-day flavour must be present. Roast, freshness, brewing and serving temperature remain important parts of the experience regardless of the forecast.
At home, comfort can come from straightforward choices: a clean cup, a suitable brewing space and enough time to taste without distraction. Select the coffee because you enjoy its flavour, not because one origin is supposed to match bad weather. A short tasting note can help separate the qualities of the coffee from the pleasant associations of the occasion.
The conversation
A good question can make a better brew.