The Mekong Delta and Lower Mekong Basin are situated within the tropical zone of Southeast Asia, and have a tropical monsoon climate. The region can be best described in four “seasons”: cool & dry, hot & dry, hot & wet, and cool & wet. Each season has its own advantages and disadvantages for travel.
Cool & Dry Season
The cool and dry season typically begins in November and ends in mid-February. This time of year is considered the ideal travel period, and peak tourist season, for the Mekong Delta. Warm days with clear skies and gentle breezes are typical. Generally during this season, you will see less vacancy and higher prices for hotels, river cruises and airfare. High temperatures during the day average near 88°F (31°C), and occasionally reach up to 95°F (35°C) with the average low around 73°F (23°C) during the evenings.
Hot & Dry Season
The hot and dry season begins to appear in mid-February and continues until mid-May. During this season, the Mekong River, its tributaries and lakes will be at their lowest levels of the year. The temperature peaks between April and May with the average high near 95°F (35°C) with some days reaching just above 100°F (38°C). In the evenings, the average low temperature is around 75°F (24°C). During this time of year, you typically find that popular destinations and attractions will be less crowded and may even find better deals on hotels and airfare.
Hot & Wet Season
The Hot and Wet season typically starts from mid-May going through till the end of August. While the heat remains in the region, rain begins to fall causing the air to be consistently humid. In May and June, the rain is fairly predictable and generally begins in the afternoon or after nightfall, lasting no more than a few hours. Although many travelers may be put off by the idea of rain, the wet season is one of the best times to see the Angkor temples in Siem Reap having full moats surrounding some of the temples. Average high temperatures are around 92°F (34°C) with evening lows near 75°F (24°C).
Cool & Wet Season
The Cool and Wet season is typically seen starting in September and continues until about mid-November. Towards the beginning of September is when the rainfall has passed its peak and significantly decreases toward the end of the month which transitions the region into the most desirable travel season. Days are typically humid with average high temperatures around 90°F (32°C) and lows around 75°F (24°C). Usually, this is a great time to see Tonle Sap Lake as the waters are high, filling the lake and producing a more lush and green environment.
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