September weather forecast
Udon Thani, Thailand

The arrival of September in Udon Thani brings with it a retreat of the monsoon, characterized by reduced rainfall, yet it remains high at 235mm (9.25"). While temperatures remain comfortably warm during the day and at night, the city sees a drop in daylight hours. Relative humidity remains at a high 81%, keeping the air dense and saturated. Therefore, the weather in Udon Thani in September can be classified as warm, decreasing rainfall, and high humidity, hinting at the waning monsoons.

Temperature

The initiation of September sees an average high-temperature of a still hot 31.9°C (89.4°F), showing minor variations from the previous month. An average low-temperature of 24.2°C (75.6°F) is anticipated throughout the nights during September.

Heat index

For most parts of September, the heat index is calculated to be an extremely hot 44°C (111.2°F). Heed: Expect heat cramps and heat exhaustion. Continued action may cause heatstroke.
Take note of the fact that heat index values are based on shaded circumstances with light airflows. Exposure to direct sunlight may make the heat index values climb by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', integrates the air's temperature and its humidity to showcase the felt temperature by people. Factors encompassing physical activity, clothing, and metabolic differences have a role in shaping the individual's impression of temperature. Realize that direct exposure to sunlight can augment the felt heat, leading to a potential increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely significant for children. Typically, children face more danger than adults as they usually perspire less. Their larger skin surface relative to their small bodies and increased heat output from their activities enhance their risk.
To offset high temperatures, the human body releases sweat which, upon evaporation, cools it down. With a high level of moisture in the air, the evaporation process becomes less efficient, preventing the body from cooling down efficiently and resulting in a sensation of overheating. When body temperature rises due to an imbalance in heat gain, there's a potential for dehydration and overheating.

Humidity

August and September, with an average relative humidity of 81%, are the most humid months in Udon Thani.

Rainfall

The month with the most rainfall is September, when the rain falls for 18 days and typically aggregates up to 235mm (9.25") of precipitation.

Daylight

In Udon Thani, the average length of the day in September is 12h and 14min.
On the first day of September in Udon Thani, sunrise is at 05:54 and sunset at 18:22. On the last day of the month, sunrise is at 05:58 and sunset at 17:58 +07.

Sunshine

June through September, with an average of 5h of sunshine, are months with the least sunshine.

UV index

The months with the highest UV index are March through September, with an average maximum UV index of 12. A UV Index reading of 11, and higher, represents an excessive health risk from unprotected exposure to Sun's UV rays for the ordinary person.
Note: A daily high UV index of 12 in September leads to these guidelines:
Carry out every crucial safety measure. People with fair skin may sustain burns in fewer than 5 minutes. UV radiation from the Sun is most intense between 10 a.m. and 4 p.m. Try to avoid direct sunlight during this period. For excellent sun protection for the eyes, ears, face, and neck, consider a wide-brim hat. Prompt application of a broad-spectrum sunscreen, SPF 30+, is necessary after a swim or an outdoor workout and it should be re-applied every two hours.