Weather in Udon Thani

Find out what weather awaits you in Udon Thani. This section presents up-to-date weather reports, charts, and detailed forecasts to help you plan your day.

The climate in Udon Thani, located in Thailand, is characterised as tropical monsoon. This means that warm or hot weather prevails here throughout the year, and temperature fluctuations between seasons are not too significant. Average annual temperatures are comfortable for travel, however, it is worth paying attention to the distribution of rainfall.

Two main seasons are clearly distinguished in Udon Thani: dry and wet. The dry season usually lasts from November to February. During this time, rainfall is minimal (0-1 mm), and the number of rainy days does not exceed 1-3 per month. Air temperature during this period is the most comfortable, with average values from 22.5°C to 25°C. March and April are transitional months to the rainy season, characterised by the highest temperatures (average maximum up to 35.5°C in April) and a gradual increase in rainfall.

The wet season, or rainy season, covers the period from May to October. During these months, the amount of precipitation increases significantly (peaking in July with 10 mm) and, more indicatively, the number of rainy days – from 19 to 26 days per month from May to September. Despite frequent rains, the air temperature remains high, averaging around 27-30°C. This period is distinguished by high humidity. October marks a gradual transition back to the dry season.

Udon Thani experiences a tropical climate with distinct temperature fluctuations throughout the year. The hottest month is usually April, when the average maximum temperature reaches 35.5°C, and the average temperature is 30.3°C. The coolest months are considered December and January. In December, the average temperature drops to 22.5°C, while minimum night-time temperatures can reach 16.9°C, and in January the average temperature is 23.0°C with minimum values around 17.1°C. Thus, the annual temperature range is quite wide, from pleasant coolness to intense heat.

The period from March to May is characterised as the sweltering season, with daytime temperatures regularly exceeding 30°C and peaking in April. From May to September, despite a slight decrease in maximum temperatures to 31-34°C, high humidity is felt due to the large number of rainy days, making the heat more perceptible. The "winter" season, covering the months from November to February, brings more comfortable weather. At this time, daytime temperatures fluctuate between 28-31°C, and nights become noticeably cooler, especially in December and January, when the thermometer can drop below 20°C.

An interesting feature of the Udon Thani climate is the diurnal temperature variation. The greatest difference between daytime highs and night-time lows is observed in the dry and cool season (December-January), where it can be around 11-12°C (for example, in January from 17.1°C to 29.0°C). In the hot and wet season (for example, in July), this difference decreases, amounting to approximately 6-7°C (from 25.3°C to 31.6°C), which is associated with greater cloud cover and humidity retaining heat at night.

A clearly defined change of rainfall seasons is observed in Udon Thani throughout the year. The city experiences a prolonged wet season, which gives way to a distinct dry period, which is typical for the climate of Thailand.

The rainy season in Udon Thani usually lasts from May to September, reaching its peak in July and August. During these months, the number of rainy days is at its maximum: July and August see an average of 26 days with precipitation each, and September – 25 days. July is also the month with the highest average rainfall, although it amounts to only 10 mm. May and June are also characterised by a high frequency of rainfall, with 19 and 23 rainy days respectively. Rains during this period are generally frequent, although the total monthly amount of falling precipitation may be small.

The dry season covers the period from November to March. The driest months are December, January, and November, when the average rainfall is 0 mm, and the number of rainy days is minimal – just 1-2 days per month. In February and March, the amount of precipitation remains very low (on average 1 mm), and the number of days with rain increases slightly to 3-5, heralding the approach of the wet season. April and October can be considered transitional months, with 7 and 14 rainy days and an average rainfall of 2 mm and 4 mm respectively.

When planning a trip to Udon Thani, it is important to consider its tropical climate with distinct dry and wet seasons. It is warm here all year round, so the basis of your wardrobe should be light, breathable clothing made from natural fabrics, such as cotton or linen. Do not forget comfortable walking shoes, high SPF sunscreen, sunglasses, and a hat for sun protection, especially during the hot months from March to May when temperatures can reach 35°C.

In the dry season, which lasts roughly from November to April, rainfall is minimal. During this time, t-shirts, shorts, skirts, and light dresses will come in handy. Although the days are hot, evenings and early mornings, especially from December to January, can be a little cooler (around 17-19°C), so a light jumper or cardigan may prove useful. This period is ideal for exploring the city without frequent rains.

The rainy season in Udon Thani usually falls between May and October, with peak rainfall from July to September. During these months, it is worth taking a light raincoat or a compact umbrella, as rains can be frequent and intense, though usually short-lived. Clothing should be not only light but also quick-drying. Insect repellent will also be useful, especially in the evening. Despite the rain, temperatures remain high, so the principle of layering is not as relevant as having protection from moisture.