When to Visit Krabi

Krabi sits on Thailand's Andaman coast, which puts it firmly under the influence of the southwest monsoon rather than the Gulf of Thailand's weather patterns. The year divides into two seasons that couldn't feel more different from each other: a dry period running from late November through April, when the skies clear and the Andaman Sea turns an almost unreasonable shade of turquoise, and a wet season from May through October when persistent moisture rolls in off the Indian Ocean. That division is real, but it's worth knowing that "wet season" in Krabi rarely means all-day rain. The monsoon tends to arrive in concentrated afternoon or evening bursts, leaving mornings workable even at the height of summer. Temperatures stay impressively consistent year-round, as you'd expect from a coastal tropical climate. Daytime highs hover between 31°C (88°F) and 34°C (93°F) in every month, with the warmest stretch coming in February, March, and April just before the rains arrive. Nights are comfortable by tropical standards. Lows drop to around 21°C (70°F) in January and December, and rarely climb above 23°C (73°F) even in the depths of the monsoon. Humidity holds at a steady 70% throughout the year, though it tends to feel more oppressive during the wet months simply because cloud cover traps the heat closer to the ground. The most striking feature of Krabi's climate is the dramatic swing in rainfall between its driest and wettest months. October is the heaviest month by a significant margin, typically receiving around 323mm (12.7 inches). That's more than ten times January's modest 33mm (1.3 inches). August and September run close behind. That kind of rainfall can close boat routes to the islands for days at a stretch and turns the limestone karst valleys into temporary waterfalls. The tradeoff is a lushness that hits you in the chest. The jungle behind Ao Nang goes impossibly deep green, and the crowds thin almost to nothing.