In 30 seconds: Espresso is the most sensitive drink in any café, and a hot, humid island makes it even more so. Damp air changes how ground coffee behaves, so a good barista tastes and adjusts the grind through the day ("dialling in"). Heat and moisture also make coffee go stale faster, so beans want to be fresh, sealed and kept cool. For you, the takeaway is simple: drink espresso the moment it lands, go iced or milky if a straight shot feels heavy at noon, and at home keep your beans airtight and out of the fridge.
Why does espresso care about the weather?
Espresso pushes hot water through a tightly packed puck of finely ground coffee, under pressure, in well under a minute. Because it all happens so fast, small changes matter: the grind size, the dose, how evenly the coffee is packed, the water temperature. A shift that would barely register in a French press can turn a sweet, balanced shot into one that tastes sour or bitter.
That is why baristas talk about dialling in: pull a test shot, taste it, adjust, repeat until it tastes right. In a cool, air-conditioned city café, that setting can hold for hours. On a tropical island, where a bright morning can turn into a downpour and back again, it tends to drift more.
What humidity actually does to coffee
None of this means the coffee is bad. It is just physics, and once you know it, a lot of "why does this taste different here?" makes sense.
- Ground coffee soaks up moisture. Roasted coffee is hygroscopic, meaning it absorbs water from the air. Espresso grounds are very fine, so there is a lot of surface to absorb it, and quickly.
- Damp grounds clump and pack differently. Moist particles stick together, which can slow the water down or open up "channels" where it rushes through one weak spot. Either way, the coffee extracts unevenly.
- Flavour fades faster. Heat, moisture and oxygen are what make roasted coffee go stale. In warm, damp air an opened bag loses its aromas sooner, and the shot can taste flat or papery.
- One small upside: less static. Humid air tends to reduce static, so grounds cling less to the grinder and the counter stays tidier.
How baristas keep up through the day
In a hot climate, the setting that tasted perfect at opening may not taste the same by early afternoon, once the room warms up or the air changes after rain. These are the habits you will see in well-run cafés in the tropics:
- Tasting more than once a day. Shots get checked regularly and the grinder gets nudged when they drift. As a rough rule, if shots start running slow and tasting harsh, the grind goes a touch coarser; if they rush through and taste sour, a touch finer.
- Grinding to order. Coffee is ground for each drink, never ahead of time. Pre-ground coffee sitting in a humid room loses flavour fast.
- Protecting the beans. Bags stay sealed, out of the sun and away from the heat of the machine, and the grinder hopper is filled little and often rather than all at once.
- Watching the whole drink. Warm cups for hot drinks, plenty of ice for cold ones, so the coffee tastes the way it was meant to rather than lukewarm or watered down.
Ordering espresso on a hot island morning
You do not need to know any of the science to enjoy a good shot, but a few habits help:
- Drink it straight away. The crema and the aromas fade within a minute or two. Espresso is not a drink to leave while you answer messages.
- Sip some water first if it comes with a glass. It resets your palate so you taste the coffee, not your breakfast.
- Go cold if a straight shot feels heavy at noon. An iced americano (espresso over cold water and ice) or an iced latte keeps the espresso character while cooling you down. Espresso over tonic water is another refreshing, alcohol-free combination you will find in many specialty cafés.
- Want smooth and low in acidity? That is a different method altogether: see why cold brew suits the tropics.
- Ask what is tasting best today. Baristas usually know which coffee is singing on the day, and they are happy to tell you.
New to the vocabulary? Our Siargao coffee cheat-sheet decodes flat whites, cortados and the rest.
Keeping beans fresh in your villa or homestay
If you travel with your own coffee or brew at home while staying on the island, the climate works against you. A few simple rules go a long way:
- Buy small. Get an amount you will finish in a week or two rather than a big bag that slowly fades.
- Seal it. Use an airtight, opaque container and keep it in a cool, shaded cupboard, not on a sunny shelf or next to the stove.
- Skip the fridge. Cold beans meeting warm, humid air collect condensation every time you open the container, and fridges pass on smells. If you need to store coffee for longer, freeze it in small sealed portions and let each one come to room temperature before opening.
- Grind just before brewing. Whole beans hold their flavour far longer than ground coffee. If you have no grinder, buy ground coffee in very small amounts.
What you can order at Marajaw
Our coffee menu includes Espresso (₱150), Americano and Long Black (₱150, or ₱160 iced), Cappuccino (₱175), Caffe Latte (₱175, or ₱185 iced) and Flat White (₱180). We are open daily, 8am–5pm. See our menu for the current selection and prices. See our menu.
Frequently asked questions
Does humidity affect espresso?
Yes. Ground coffee absorbs moisture from the air, which changes how it packs and how quickly water flows through it. In humid weather, baristas usually taste and adjust the grind more often to keep shots balanced.
Why does espresso taste sour or bitter on some days?
Usually the grind no longer suits the conditions. A shot that runs fast and tastes sour is under-extracted, so the grind needs to be finer. A shot that runs slow and tastes harsh or bitter is over-extracted, so the grind needs to be coarser. Stale beans tend to taste flat whatever you do.
Should I keep coffee beans in the fridge in a tropical climate?
Generally no. Condensation forms when cold beans meet warm, humid air, and fridges pass on odours. An airtight, opaque container in a cool cupboard works better. For longer storage, freeze small sealed portions.
What is a good espresso drink for a hot day?
An iced americano or an iced latte keeps the espresso flavour while cooling you down. Espresso over tonic water is another refreshing, alcohol-free option found in many specialty cafés. For something smoother and less acidic, try cold brew.
How long does an espresso stay good after it is made?
It is best within a minute or two. The crema breaks down and the aromas fade quickly, so drink it as soon as it arrives.