Most coffee storage advice is written for cool, dry kitchens. Ours are neither, and a bag that would last two months in a temperate climate can go noticeably dull here in a fortnight.
What actually damages coffee
- Oxygen - the main culprit. It oxidises the oils that carry aroma.
- Humidity - coffee is hygroscopic and pulls moisture straight out of the air.
- Heat - speeds up every one of these reactions.
- Light - degrades the oils directly.
The short answer
Keep it in the bag it came in, push the air out, seal it properly, and put it in a cupboard. That is genuinely most of it. The pouch is foil-lined with a one-way valve precisely so carbon dioxide can escape without oxygen getting in - it is better at this job than almost any jar you own.
The fridge myth
Do not keep coffee in the fridge. It is humid, and coffee readily absorbs the smell of everything else in there. You will taste last night’s dinner.
The freezer is different, but only under one condition: the bag must be unopened, and must stay unopened until it comes fully back to room temperature. Otherwise condensation forms on cold beans the moment you open it, and wet coffee is finished. For anything you are drinking this month, a cupboard is simply better.
A fresh bag stored badly will taste worse than an older bag stored well.
Buy smaller, more often
The most effective storage strategy is not storing much. A 250g pouch is roughly two to three weeks of coffee for one regular drinker - about as long as it stays at its best once opened anyway. Buying a kilo to save on delivery usually costs more in flavour than it saves in rupees.