Discover the best time of year, based on historical climate, temperature, and precipitation.
The best weather in Koror is from March. — some variation climate
⛈Hot & rainy
| Score | 47 | 52 | 54 | 43 | 39 | 38 | 37 | 39 | 37 | 36 | 39 | 41 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Climate | Hot & rainy | Hot & rainy | Hot & rainy | Hot & rainy | Hot & rainy | Hot & rainy | Hot & rainy | Hot & rainy | Hot & rainy | Hot & rainy | Hot & rainy | Hot & rainy |
| Temperature | 25–29°C | 25–29°C | 25–29°C | 25–29°C | 25–29°C | 25–29°C | 25–29°C | 25–29°C | 25–29°C | 25–29°C | 25–29°C | 25–29°C |
| Feels like | 29–33°C | 28–33°C | 29–34°C | 29–35°C | 30–36°C | 30–35°C | 29–35°C | 30–35°C | 30–35°C | 29–35°C | 30–35°C | 29–34°C |
| Precipitation | 312mm 30 days | 249mm 27 days | 209mm 29 days | 350mm 30 days | 394mm 30 days | 453mm 30 days | 656mm 30 days | 554mm 30 days | 484mm 30 days | 458mm 30 days | 346mm 30 days | 425mm 30 days |
| Sunshine | 6.3h ☀︎ 54% | 6.8h ☀︎ 58% | 7.7h ☀︎ 63% | 7.3h ☀︎ 59% | 6.4h ☀︎ 52% | 5.8h ☀︎ 46% | 4.7h ☀︎ 37% | 6.1h ☀︎ 49% | 5.8h ☀︎ 48% | 5.2h ☀︎ 43% | 6.4h ☀︎ 54% | 5.9h ☀︎ 51% |
| Wind | E · 21 km/h | NE · 23 km/h | E · 20 km/h | NE · 18 km/h | E · 17 km/h | E · 14 km/h | S · 15 km/h | SW · 15 km/h | SW · 15 km/h | SW · 17 km/h | E · 16 km/h | E · 18 km/h |
| Humidity (%) | 84% | 83% | 83% | 85% | 87% | 88% | 89% | 87% | 86% | 86% | 87% | 87% |
| Day length | 11.7h | 11.9h | 12.1h | 12.3h | 12.5h | 12.5h | 12.5h | 12.4h | 12.2h | 12.0h | 11.8h | 11.7h |
Most travelers arrive in Koror during northern vacation seasons when the skies are at their most volatile; the genuine window of calm, clear water belongs almost exclusively to February and March.
Nobody travels to Koror for the town itself. Sprawled across Koror Island—known traditionally as Oreor—this commercial capital is a functional, low-slung sprawl where the vast majority of Palau's people live and work, stitched together by causeways to neighboring outcrops like Malakal Island and Meyuns. You base yourself here for what lies beyond the docks: the sudden transition from paved harbor roads to turquoise channels carving through mushroom-shaped limestone islands. But because virtually every hour of your trip is spent on an open-deck skiff or submerged along outer reef walls, the sky governs everything. Pick the wrong week, and paradise becomes a bone-rattling boat ride through horizontal tropical squalls under a slate-gray ceiling.
In an equatorial archipelago, 'dry' is a relative term—the rainforest never truly turns off its taps. Yet February and March are as close to perfection as the western Pacific allows. The daily torrents ease into light, passing showers that clear out within half an hour, leaving behind hours of unbroken sunlight and ocean surfaces that resemble poured glass.
Out on the water, this makes all the difference. Visibility offshore reaches its peak, and navigating the shallow passages around the islands requires none of the white-knuckle squinting through torrential downpours that characterizes other months. The air feels cleaner, the trade winds take the sting out of the midday heat, and boat departures run with quiet predictability.
Crowds during these two months are steady but civilized. You will share the dive slips and anchorages with serious divers and naturalist travelers who know the maritime calendar, but the frantic pace of midsummer is absent. If you want Palau to look like its postcards, this is the only window that reliably delivers.
By late April, the atmosphere over Koror begins to thicken. Temperatures on paper do not budge, but the humidity climbs until stepping out of an air-conditioned room feels like walking directly into a warm, wet washcloth. The trade winds falter, leaving the sheltered harbors around Malakal Island dead calm and stiflingly hot.
Rainfall mounts through May and June, shifting from polite morning sprinkles to thunderous downpours that arrive with little warning. You will still find substantial stretches of blue sky, particularly in the mornings, but planning an all-day boat expedition becomes an exercise in dodging dark, bruised squall lines drifting across the horizon.
The upside to this rising humidity is a noticeable drop in human traffic. Between April and June, visitor numbers taper off. You can wander through Meyuns or watch the harbor skiffs return without feeling caught in a logistical conveyor belt, and securing a private charter for the outer channels requires little more than a conversation at the dock.
July and August present the central paradox of Koror: they are among the busiest months of the year for tourism, yet they bring the most ferocious weather on the annual calendar. Driven by international summer school breaks, visitors descend in droves precisely when the monsoon troughs churn through Micronesia.
July is staggering in its wetness. The rain does not merely fall; it dumps in blinding, sustained sheets that can wash out visibility entirely, turning boat transits between the islands into shivering, spray-soaked endurance tests. Even the lagoon's vibrant blues wash out to a dull, churning green under days of continuous cloud cover.
Traveling now requires sheer stubbornness and waterproof gear for every single possession. While sea temperatures remain balmy and the marine life beneath the swell carries on undisturbed, surface intervals are spent shivering beneath boat awnings. Booking your journey during this summer peak simply because the calendar says it is holiday season is the most common mistake outsiders make.
As the summer crowds evaporate, the moisture stays behind. September and October represent the lowest point of the weather year, characterized by lingering tropical disturbances and the lowest amount of daily sunshine. It is a brooding, moody period where days can pass without the sun ever truly burning through the cloud deck.
Yet for travelers who value solitude above picture-perfect skies, there is a certain rhythm to embrace. The dive operators on Koror Island are unhurried, local life along the causeways settles into an intimate, sleepy baseline, and you will often find yourself the sole boat floating in a hidden cove.
You must, however, surrender to the wet. Hiking trails across nearby ridges turn to slick red clay, outer reef trips are frequently cancelled due to high sea chop, and clothes hung up to dry in your room will simply remain damp for three days straight. It is a trip for marine purists who care only about what is underwater, where the rain cannot reach them.
November marks the arrival of peak season, hitting maximum visitor volume as travelers arrive from across East Asia and North America seeking winter warmth. The weather, however, does not instantly flip to match the holiday spirit. November remains notoriously drenched, receiving heavy bursts of rain that routinely disrupt outdoor plans.
Only as December progresses toward January do the winds begin to organize themselves, gradually sweeping away the stalled rain systems and clearing the sky for longer stretches. Even so, December retains a wild, unpredictable edge; holiday travelers often find themselves alternating between sparkling tropical mornings and afternoon downpours heavy enough to overwhelm town drainage.
This is a high-energy, crowded stretch where every boat is chartered, hotels run at capacity, and the harbor front is constant motion. If you must travel over the year-end holidays, aim for the tail end of January, when the skies steadily dry out, the trade winds steady, and the festive crowds finally begin the journey home.