Vientiane's climate is characterized by a gradual warming trend throughout the year, with temperatures rising steadily from around 20°C in January to a peak of up to 40°C in May and June. The dry season dominates from February to July, with temperatures fluctuating between day and night but remaining relatively hot overall. August marks a slight cooling trend, but by September the heat begins to build again ahead of the wet season, which brings slightly milder conditions from October to December. The coldest months are January and December, while May and June are the warmest.