Taiwan has a subtropical to tropical climate, with warm temperatures year-round in the lowlands, high humidity in every season, and a distinct wet season driven by monsoons and typhoons. The island sits just north of the Tropic of Cancer, so the southern half is technically tropical while the north is subtropical. Average temperatures range from about 20°C (68°F) in winter to nearly 30°C (86°F) in summer, but the actual feel varies dramatically between the flat southern plains, the cloudy northern coast, and the mountainous interior.
Summer: Hot, Humid, and Stormy
Summer runs roughly from June through September, and it’s the most intense season. In Kaohsiung, the largest city in the south, average temperatures sit between 28°C and 29.5°C (83–85°F), with daytime highs regularly reaching 33°C (91°F) or above. Taipei, in the north, is similarly hot but often feels worse because the surrounding basin traps heat and moisture. Relative humidity commonly exceeds 75% during these months, which pushes the perceived temperature well above what the thermometer reads.
Afternoon thunderstorms are a near-daily occurrence in summer. These are typically short, intense downpours that roll in, drench everything for 30 to 60 minutes, and clear out. Locals carry foldable umbrellas as a default accessory. Lightweight, breathable clothing is essential: cotton and cooling fabrics, shorts, sandals, hats, and sunglasses.
The Plum Rain Season
Before the full heat of summer arrives, Taiwan goes through a rainy period called the Meiyu, or plum rain season. It lasts roughly two months, from May into June, and is caused by fronts that form where cold continental air meets warm, moist air from the Pacific. The result is prolonged, sometimes heavy rainfall across the entire island, quite different from the quick summer showers. Overcast skies and persistent drizzle can last for days at a stretch, and flooding is a real concern in low-lying areas. If you’re planning a trip, this is the wettest and least predictable window of the year.
Typhoon Season
Typhoons are the defining weather risk in Taiwan. The official season runs from May to November, but the peak months are July through September. Over the past 40 years, an average of roughly 1.9 typhoons per year have made direct landfall on the island, though many more pass close enough to bring heavy rain and wind. When a typhoon does hit, the government issues “typhoon days” that close schools and businesses. The storms bring the heaviest rainfall Taiwan sees all year and are a major driver of landslides in mountainous areas.
Even typhoons that don’t make landfall can dump enormous amounts of rain on the island’s steep terrain. If you’re visiting during peak season, it’s worth keeping an eye on weather forecasts a week out and having flexible plans.
Winter in the North vs. the South
Taiwan’s winter, from December through February, reveals a sharp split between the northern and southern halves of the island. The northeast monsoon sweeps cold, moisture-laden air down from the Asian continent, and the Central Mountain Range acts as a wall. Northern cities like Taipei and Keelung get the brunt of it: overcast skies, frequent drizzle, and raw, chilly air. Temperatures in the north drop to around 12–16°C (54–61°F) on cooler days, rarely freezing but uncomfortable when paired with the dampness and wind.
Southern Taiwan tells a completely different story. Kaohsiung’s coolest months, January and February, still average around 19.9–21.5°C (68–71°F), and the skies are often clear and sunny. Many visitors and even locals from the north head south during winter specifically to escape the gray weather. The contrast is striking for an island only about 400 kilometers long.
Mountain and High-Altitude Climate
Taiwan’s interior is dominated by mountains, with peaks above 3,000 meters (nearly 10,000 feet). Yushan, the highest point, reaches 3,952 meters. Temperatures drop steadily with elevation, falling roughly 5 to 5.6°C for every 1,000 meters of altitude gained during spring and summer. In winter, the rate is lower, around 3.2 to 3.6°C per kilometer, partly because cold air pools in valleys and reduces the contrast.
What this means in practice: a pleasant 25°C day in the lowlands can translate to near-freezing conditions at 3,000 meters. Snow falls on the highest peaks in winter, and popular mountain destinations like Alishan and Hehuanshan draw crowds hoping to see it. If you’re heading into the mountains at any time of year, layering is critical. Conditions change fast, and temperatures at summit areas can swing 15°C or more compared to where you started your hike.
Humidity and How It Feels
The single most common complaint from visitors to Taiwan, regardless of season, is the humidity. From March through November, relative humidity regularly exceeds 75%, and during the wettest months it can hover near 85–90%. This affects daily life in ways that go beyond comfort. Clothes take longer to dry. Electronics fog up when you step outside from air-conditioned spaces. Mold is a constant battle in homes and hotels, particularly in the north during winter.
In summer, the combination of 32°C heat and 80% humidity creates a heat index that can feel like 40°C or higher. Staying hydrated and seeking air-conditioned spaces during midday hours is standard practice. Even in the relatively mild spring and fall, humidity keeps the air feeling thick. The only real relief comes in the mountains, where drier and cooler air prevails at higher elevations.
Spring and Fall: The Best Windows
October and November, along with March and April, are widely considered the most comfortable months to be in Taiwan. Temperatures in the lowlands hover between 22°C and 28°C (72–82°F), typhoon risk is lower (though not zero in October), and the plum rains haven’t started yet in spring. Humidity is still noticeable but more tolerable than in the summer months. These shoulder seasons offer the best balance of warm weather, manageable rainfall, and outdoor comfort, which is why they’re the most popular periods for hiking, cycling, and general tourism.
Fall in particular brings clear skies to much of the island before the northeast monsoon fully sets in. Southern Taiwan remains pleasant well into December, effectively extending the comfortable season by another month or two compared to the north.