Ko Kood (also spelled Koh Kut) is one of Thailand's largest islands yet remains remarkably undeveloped, a place where jungle-covered hills slope down to white sand beaches and water so clear it draws comparisons to the Maldives. Sitting in the Gulf of Thailand near the Cambodian border in Trat Province, the island is home to small fishing villages, a handful of waterfalls tumbling through tropical rainforest, and a pace of life that revolves around beach time, fresh seafood, and spectacular sunsets. There's no nightlife to speak of, no jet skis, and barely any traffic on the roads. That's exactly the point.
Your prime window for Ko Kood runs from early December through late January, when the island's driest weather, comfortable temperatures, and calm seas all line up perfectly. Winter highs of 89.4°F (31.9°C) feel pleasantly warm rather than punishing, rain is rare at just 3 to 5 percent likelihood, and the sea is flat enough for snorkeling day trips to nearby Koh Rang Marine National Park. This is also high season, so book accommodation early, particularly around the popular Khlong Chao and Bang Bao beach areas. If you'd rather dodge peak-season pricing, late November offers nearly identical weather with thinner crowds and lower accommodation rates as the wet season has just wrapped up.
Spring in Ko Kood, Thailand
March through May is Ko Kood's hot season, and it earns that name. Highs average 97.3°F (36.3°C), and by mid-April the mercury climbs to peak readings of 100.8°F (38.2°C) with overnight lows only dipping to 76.1°F (24.5°C). The heat is compounded by air quality that deteriorates during these months as haze from agricultural burning on the mainland can drift over the Gulf of Thailand. While coastal Ko Kood fares better than northern cities like Chiang Mai, sensitive travelers may notice the difference, and the air can reach Unhealthy levels on the worst days in March. If you visit during this stretch, plan outdoor activities for early morning when temperatures are closer to the seasonal low of 73.3°F (22.9°C).
Rain begins to build through the season, rising from a 12 percent chance in March to 37 percent by May, and you'll notice the humidity climbing as well. The upside is that the island's waterfalls start running stronger as precipitation increases. Khlong Chao Waterfall, the island's most popular swimming hole, and the more secluded Khlong Yai Kee Waterfall both gain volume as the rains arrive, so if waterfall swimming is on your list, late in the season delivers better flow than the bone-dry winter months. Tourism is the second busiest of the year, partly driven by Thai holiday visitors. Pack sun protection, a reusable water bottle, and lightweight long sleeves that can double as coverage against both sun and sandflies.
Summer in Ko Kood, Thailand
The wet season arrives in full by June, and Ko Kood transforms into a lush, deeply green island with far fewer visitors to share it with. Afternoon downpours become common, with rain chances sitting between 33 and 39 percent across the three months, and August tends to be the wettest of the trio. Seas can turn choppy, which limits snorkeling day trips to Koh Rang Marine National Park and occasionally disrupts ferry schedules. Some smaller restaurants and guesthouses close for the season entirely, so your dining options narrow, though the popular night market near Khlong Chao Beach and well-established restaurants like Black Bananas typically keep operating.
Despite the rain, summer has its appeal. Highs average 91.2°F (32.9°C), a significant step down from the scorching spring, and lows of 75.4°F (24.1°C) keep nights warm and comfortable. Mornings frequently dawn clear and sunny before clouds build in the afternoon, leaving a solid window for beach time or a scooter ride to the fishing village of Ao Salat, where stilt houses and elevated boardwalks over the water offer a glimpse of traditional island life. Accommodation prices drop noticeably, and you can often have entire stretches of white sand to yourself. Bring a sturdy rain jacket, reef-safe sunscreen, and waterproof bags for electronics.
Fall in Ko Kood, Thailand
September opens as the tail end of the wet season, and it's the wettest single month on the island with rain falling on roughly half of all days. Seas remain rough early in the period, and some boat operators reduce their schedules. By October, conditions begin shifting quickly as showers become less frequent and the water starts to calm. The island's landscape is at its most vibrant, with jungle trails thick and green, perfect for treks inland if you can handle the humidity, which hovers near 77 percent in October.
November is where fall really shines. Rain probability drops to just 6 percent, and with seasonal highs of 89.8°F (32.1°C) and lows of 71.9°F (22.2°C), the temperature sits in a sweet spot between the brutal heat of spring and the still-warm-but-comfortable winter. Tourism is fairly slow compared to peak season, meaning accommodation rates are lower and beaches like Khlong Chao, Ao Tapao, and Bang Bao feel wonderfully uncrowded. The sea flattens enough for snorkeling off the rocky headlands, and kayaking through the island's mangrove forests becomes a calm, glassy experience. Resorts and restaurants that shuttered during the worst of the monsoon reopen in time for November visitors, so services are back at full strength. Pack layers for boat rides, when sea breezes can make the evenings feel cool.
Winter in Ko Kood, Thailand
December through February is when Ko Kood is at its best. The rain essentially stops, with chances of a wet day hovering between 3 and 5 percent, and the Gulf of Thailand turns into that postcard-perfect turquoise that the island is known for. Highs average 89.4°F (31.9°C), warm enough for all-day beach lounging but far more tolerable than the spring furnace. Evenings can feel surprisingly cool by tropical island standards, with lows dropping to 62.2°F (16.8°C), pleasant enough to enjoy a sunset drink on Bang Bao Beach without breaking a sweat. Humidity is also at its lowest, dipping below 50 percent in February, making this the most comfortable stretch for exploring by scooter or on foot.
Calm, clear seas make this the prime window for snorkeling and diving. Day trips to Koh Rang Marine National Park offer some of the best coral reef viewing in the Gulf, and even casual snorkeling off Bang Bao's rocky headlands rewards you with fish and sea life. One thing to note: the island's waterfalls slow to a trickle during the driest weeks, so don't expect the gushing cascades of wet-season photos. Khlong Chao Waterfall still makes a lovely stop for a jungle swim, but the flow is modest. Despite being the driest and most comfortable season, Ko Kood never feels overrun. The absence of a vehicle ferry keeps crowds naturally thin, and even in January and February the island maintains its trademark calm. Bring a light sweater or sarong for evenings, and plenty of cash since ATMs are limited on the island.
At a Glance
Monthly weather, visitor crowds, air quality, holidays, and daylight hours to help you plan your trip.
Travel Tips & Safety for Ko Kood, Thailand
Getting to Ko Kood requires a bit of effort that's well worth it. From Bangkok, fly to Trat (about an hour) or take a bus from Ekkamai or Mo Chit station (five to six hours), then transfer to Laem Sok Pier for a speedboat or ferry ride of roughly 90 minutes. Most boat tickets include a songthaew transfer from the pier to your accommodation on the island. Renting a scooter is the easiest way to explore once you're there, as the roads are quiet and well-paved by island standards, but fuel comes from roadside vendors selling bottles rather than proper stations, so keep your tank topped up.
Bring enough Thai baht to cover your stay, since ATM access is extremely limited on the island and many smaller establishments operate on cash only. Sandflies are a known nuisance on Ko Kood's beaches; coconut oil or strong insect repellent applied to your ankles and feet helps keep them at bay. For general health, stick to bottled or filtered water, and wear reef shoes when wading in unfamiliar rocky areas.