An Giang's Climate
Sitting at the very top of the Mekong Delta, where the Tien and Hau rivers cross over from Cambodia, An Giang has a hot, sub-equatorial monsoon climate with no real winter. Life here — the rice crops, the floating fish farms, the festival calendar — moves to the rhythm of two seasons and the annual rise and fall of the Mekong.
Two seasons, one river
The rainy season stretches from April to November and delivers most of the province's roughly 2,270 mm of annual rainfall. October is the wettest month, with around 381 mm falling on some 29 rainy days — mostly short, intense afternoon downpours. The dry months from December to March bring clear skies over the emerald paddies of Ta Pa in Tri Ton; January nights dip to about 22°C, cool by delta standards, while March is the hottest month, with average daytime highs of 34°C and spikes near 36–37°C at the foot of the mountains around Tinh Bien.
The floating season
Nowhere else in the delta is the flood season felt as vividly as in An Giang. From around August, upstream water pours through Tan Chau and An Phu, spilling over Bung Binh Thien lake and the fields along the Vinh Te canal, and peaking in September–October. Locals treat it as harvest time rather than disaster: linh fish and yellow dien dien blossoms arrive with the water, and Tra Su cajuput forest is at its greenest, its channels carpeted in duckweed. In big flood years, low-lying roads near the border can go under, so check water levels at Tan Chau and Chau Doc before setting out.
The Seven Mountains' own microclimate
Rising abruptly from the flat plain, the That Son range makes its own weather. Cam Mountain, at over 700 m, runs 3–5°C cooler than the lowlands and is often wrapped in morning mist — locals call it the "Da Lat of the West". By contrast, the upland fields of Tri Ton and Tinh Bien are the driest corner of the province at the height of the dry season, when wildfire risk climbs around Tuc Dup hill. Early-season thunderstorms with lightning deserve respect if you are hiking Sam or Cam mountain. On the plus side, typhoons almost never reach this far inland, and being upstream, An Giang escapes the saltwater intrusion that troubles coastal provinces — a real advantage for its rice fields and the catfish rafts on the Hau River at Chau Doc and Long Xuyen.
When to go and what to pack
September–November is best for the floating season and Tra Su; carry a light raincoat for the afternoon storms. December–February is dry and relatively cool, ideal for climbing Cam Mountain or visiting the Lady Xu temple at Sam Mountain. From March to May, pack a wide-brimmed hat and strong sunscreen — the sun is fierce and UV levels run high. Whatever the season, bring a light jacket for chilly evenings on Cam Mountain.