Mekong Weather

Temperatures in the lower Mekong basin are uniformly warm throughout the year. Daily highs at Phnom Penh average 89 °F (32 °C), and lows average 74 °F (23 °C). In the upper basin, temperatures are moderated somewhat by altitude and generally are lower and exhibit more seasonal variation than those found farther south.
Ho Chi Minh City has a pleasant tropical climate with two alternate seasons: dry and rainy. The dry season runs from November through April with average temperatures around 28oC and the rainy season from May through October. The rain, however, never last too long while the sun is not too hot.

Best time to visit Mekong Delta

The ideal time to visit the Mekong region is during the November-to-January dry season; it's the coolest time of year in often sweltering Southeast Asia. If you are traveling to the river's headwaters, in China, the month of September is your best bet.

The hot season, from March to May is very dry, but in some places, During this time, some rivers are harder to navigate, and boat journeys in remote places may not be possible.

The most popular time of year to visit the region is between November and April. With the exception of the mountainous colder parts of Yunnan and Myanmar, the weather is at its most comfortable during this time. However, this means that in some places, accommodation may be harder to find in the high season.

The hot season, from March to May is very dry, but in some places, During this time, some rivers are harder to navigate, and boat journeys in remote places may not be possible.

The rainy season, generally from June to September is for many people the best time to travel – despite the fact that it rains, it never gets that cold, and nearly all hotels and guesthouses have rooms available – often a lot cheaper than during the high season.