Quang Nam's Climate
Quang Nam climbs from the beaches around Hoi An and Tam Ky to the nearly 2,600 m Ngoc Linh massif in the west, so Dien Ban can be baking under clear skies while Tra My sits beneath rain clouds. With roughly 3,321 mm of rain a year — among the highest totals in Vietnam — the province crams most of that water into a few furious months, splitting the calendar into two sharply different halves.
The sunny half: foehn winds and calm seas
From about February to August the province dries out and heats up, peaking in June with average highs of 35.4°C. When the southwesterly foehn — locals call it the Lao wind — spills over the Truong Son range, the air across the Dai Loc and Dien Ban plains turns parched and scorching. Late in the dry season, salt water pushes up the Vinh Dien and lower Thu Bon rivers, a headache for the Tra Que vegetable gardens and Hoi An's water supply. The upside is months of calm sea: An Bang, Cua Dai and Tam Thanh beaches are at their best, and boats to the Cham Islands run daily over water clear enough for snorkelling.
The wet half: Thu Bon floods and typhoons
Rain builds from July and lingers into February, but October is the deluge: an average of 782 mm falling across roughly 28 rainy days — barely a dry day all month. It is also peak typhoon season: floodwater races down the Vu Gia–Thu Bon river system, Hoi An's old town goes under, sampans replace scooters on Bach Dang street, and Cua Dai beach loses another strip of sand to erosion. Later, the northeast monsoon brings weeks of drizzle and rough seas that regularly suspend the island ferries.
The mountainous west: rain country
The highland districts of Tra My, Phuoc Son, Nam Giang and Tay Giang rank among the wettest places in Vietnam, and prolonged downpours trigger flash floods and landslides that can cut roads like the Lo Xo Pass on the Ho Chi Minh Road. Coastal winters stay mild — January's average lows sit near 19.1°C — but above 1,000 m the nights turn genuinely cold and misty. That cool, damp forest climate is exactly why Ngoc Linh ginseng thrives on the slopes of Nam Tra My and Tra My cinnamon is so prized.
When to go and what to pack
February to May is the sweet spot: dry, gently sunny and calm — ideal for the old town, cycling to Tra Que or visiting My Son. In June–August, hit the beach early or late, bring a wide-brimmed hat and plenty of water, and book Cham Islands boats ahead. From September to December, pack a raincoat, watch typhoon bulletins before locking in plans, and avoid mountain passes during heavy rain. For winter trips up to Tay Giang or Nam Tra My, take a warm jacket — the highlands can feel a season apart from the coast.