When we sip a great cup of coffee, we’re tasting more than just a roast profile or origin—we’re tasting the weather. From rainfall and sunshine to temperature swings and wind, the weather during the growing season has a direct impact on the quality, yield, and flavor of coffee.
Here’s how.
1. Rainfall Timing is Everything
Coffee plants need a well-balanced rainy season. Too little rain, and the cherries won’t develop properly. Too much rain, especially during flowering, can wash away blossoms and reduce the harvest.
- Ideal scenario: A dry spell to trigger flowering, followed by steady rains to support cherry growth.
- Problem: Climate change is making rainfall less predictable, leading to irregular flowering and inconsistent harvests.
2. Temperature Affects Bean Development
Arabica coffee thrives in cool, stable temperatures—typically between 18°C and 21°C (64–70°F). When temperatures rise too high:
- Bean development can speed up, reducing complexity.
- Pests like the coffee berry borer thrive.
- Plant stress increases, impacting yields.
Conversely, cool nights and warm days help create denser beans with more nuanced flavors—think fruity Ethiopian or floral Kenyan coffees.
3. Frost and Drought: The Big Threats
Extreme weather events like frost (seen in Brazil in recent years) and prolonged droughts can devastate entire crops. These events not only reduce quantity but also push prices up globally.
4. Wind and Storms
Strong winds or storms during the harvest season can physically knock cherries off trees or damage the plants themselves. They can also affect drying if the coffee is processed naturally or sun-dried.
Final Brew
In short, coffee is incredibly sensitive to the weather. A single growing season’s conditions can mean the difference between a bright, complex cup and a dull, uneven one. As climate patterns shift, growers are being forced to adapt—through shade trees, irrigation, new varietals, and more climate-resilient farming practices.
