Khong Koi Beach (also known as Klong Kloi) sits at the southern tip of Koh Chang, Thailand's second-largest island in Trat Province. It's the kind of place that rewards those who venture past the more popular west coast beaches: a relaxed, bohemian stretch of sand lined with small restaurants, beachfront bars, and modest bungalows, all with panoramic views of the smaller islands scattered to the south. Nearby Bang Bao Pier serves as the island's hub for diving, snorkeling, and island-hopping boat trips, putting you within easy reach of coral reefs, the HTMS Chang shipwreck, and the protected waters of Koh Rang National Park.
The best time to visit Khong Koi Beach is from late November through late February, when dry skies, comfortable humidity, and calm seas combine for ideal beach conditions. This is the island's dry season: rain is rare, the water is clear enough for excellent snorkeling and diving at nearby Koh Rang, and the beach bars and restaurants along the sand are all open and lively. Accommodation choices expand during these months as the high season brings more options. If you prefer lower prices and fewer visitors, the shoulder months of October and March still deliver decent weather before the monsoon fully arrives or after it fades, though you'll trade a bit of certainty for solitude.
Spring in Khong Koi Beach, Thailand
March and April are the hottest months in this part of Thailand, and Khong Koi Beach feels it. Highs average 97.9°F (36.6°C), and afternoons can be oppressive even with a sea breeze. Air quality deteriorates notably in March and April, dropping into the Unhealthy for Sensitive Groups range as smoke from agricultural burning drifts across the region. If you have respiratory sensitivities, this is a season to avoid entirely. Even for healthy travelers, the haze can obscure the views of the southern islands that make this beach so scenic.
The upside is that rain remains scarce through most of spring, with precipitation picking up only slightly in May. Mornings start warm at 70.5°F (21.4°C), so early beach walks before the heat peaks are pleasant enough. This is the second-busiest tourism window, partly driven by Thai holidays in April, so expect beach bars and restaurants to be fully operational. Pack generous sun protection and stay hydrated; the combination of heat, humidity, and haze makes midday outdoor activity punishing. A Thai cooking lesson at one of the beachside spots is a good way to spend the hottest hours in the shade.
Summer in Khong Koi Beach, Thailand
Summer on Koh Chang means monsoon season. From June through August, rain becomes a near-daily possibility, with showers falling on roughly three to six days per week at peak. August is one of the wettest stretches, and humidity climbs to its highest levels of the year, making the air feel thick even when it's not raining. Highs average 88.7°F (31.5°C), lower than spring, but the moisture in the air makes it feel warmer than the numbers suggest.
There's a silver lining if you don't mind the rain. Khong Koi Beach is sheltered from the worst of the southwest monsoon by the Bangbao peninsula, so the sea here stays calmer than on Koh Chang's exposed west coast beaches. That makes it one of the better swimming spots on the island during rainy season. Dive shops at Bang Bao Pier continue to run trips even in low season, though schedules may shift based on conditions. Tourism hits its peak volume in June and remains high, but prices for accommodation tend to run higher than usual as well. Overnight lows of 73.6°F (23.1°F) keep evenings warm enough for open-air dining, and the tropical downpours often clear quickly, leaving dramatic skies at sunset. Bring a lightweight rain jacket and waterproof phone case if you visit during these months.
Fall in Khong Koi Beach, Thailand
Fall is when Khong Koi Beach starts to turn a corner. September still sees regular afternoon showers, but by October the rain frequency drops, and November brings some of the driest days of the year with only about a 9% chance of significant precipitation. Highs average 91°F (32.8°C), warm but noticeably more comfortable than the blistering spring months. Lows settle around 70.6°F (21.4°C), making early mornings and evenings genuinely pleasant for strolling the sand or sitting in a deckchair with a cold drink.
Tourism is fairly slow during these months, so you'll find accommodation at lower rates and the beach largely to yourself. The beachfront bars and small restaurants that line Khong Koi's shore operate at a relaxed pace, and you can often have your pick of sunloungers. As November approaches, the sea clears up and snorkeling conditions improve around the nearby islands. Dive operators at Bang Bao start running their full high-season schedule, with daily boats heading out to Koh Rang National Park's protected reefs and the HTMS Chang shipwreck. Precipitation can still surprise you in early fall, so a compact rain shell is worth packing alongside your reef-safe sunscreen.
Winter in Khong Koi Beach, Thailand
December through February is when Khong Koi Beach is at its best. Rain is essentially a non-factor: February sees just a 1% chance of significant precipitation, and December and January aren't far behind. The air is clearer, humidity drops into the 57% to 69% range, and the views south toward the smaller islands are sharp and unobstructed. Highs of 90.1°F (32.3°C) are warm but manageable, especially with the dry air keeping things from feeling oppressive.
Mornings bring the coolest temperatures of the year, with lows dipping to 58.7°F (14.8°C), a refreshing change that makes early beach walks or a sunrise coffee at one of the beachfront cafes genuinely comfortable. This is peak season for Koh Chang's marine activities: daily snorkeling boats head to Koh Rang National Park where visibility can reach 15 to 20 meters, and dive schools at Bang Bao Pier run full programs including wreck dives at the HTMS Chang. Island-hopping day trips to Koh Wai and Koh Mak also run regularly from nearby Bang Bao. Despite being the theoretical low season for tourism volume, this is when the full range of services and activities is available. Book bungalows in advance if you're visiting over the Christmas and New Year period, as availability tightens. A light layer for cooler evenings and a good pair of reef shoes for the rocky sections of shoreline round out your packing list.
At a Glance
Monthly weather, visitor crowds, air quality, holidays, and daylight hours to help you plan your trip.
Travel Tips & Safety for Khong Koi Beach, Thailand
Getting to Khong Koi Beach requires a ferry to Koh Chang from the mainland pier near Trat, followed by a drive south. Songthaews (shared pickup trucks) run routes along the west coast and will drop you at the footbridge leading to the beach, though renting a scooter gives you the most flexibility to explore the island's winding, hilly roads. Be aware that monkeys are active near the parking area and will steal food or pry open scooter seats, so don't leave snacks unattended.
The roads to the southern end of the island are steep and include some unpaved stretches that become slippery in wet weather, so drive cautiously, especially after rain. Carry cash for small beachfront restaurants and massage spots, as card acceptance is limited in this part of the island. Stay alert for jellyfish and sea urchins when swimming or snorkeling, and always wear reef shoes on the rockier sections of shoreline.