September weather forecast
Luang Prabang, Laos

September marks the receding phase of the monsoon season in Luang Prabang. Rainfall volume shrinks to 173mm (6.81"), easing-off the city from the heavy wet conditions prevalent during the preceding months. The humidity level drops slightly but the city continues to be enveloped in a moisture-laden ambiance. A slight rise in temperature and extended sunshine hours hint at late summer-like conditions. Nature lovers can relish the verdant landscape adorned with a refreshed look after the intense rain of the previous months.

Temperature

September's advent denotes a minor fluctuation in the average high-temperature to a still tropical 31.9°C (89.4°F) from August's 31.5°C (88.7°F). Luang Prabang experiences a nighttime temperature average of 22.9°C (73.2°F) during September.

Heat index

Throughout September, the heat index is appraised at a life-threatening hot 47°C (116.6°F). Take caution: Heat exhaustion and heat cramps are probable. Heatstroke may be imminent with ongoing effort.
Consider that heat index readings are for situations in the shade and light wind. The presence of direct sunlight can raise the heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', is the result of factoring in humidity to the air temperature, indicating perceived warmth. One's perception of temperature can vary depending on physical activity and individual heat sensitivity, influenced by factors like wind, attire, and metabolic variations. When directly under the sun, the weather's impact can intensify, possibly boosting the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially vital to children. Children typically face more danger than adults as their sweat production is usually lower. Additionally, the bigger skin surface compared to their small size and the increased heat due to their activeness exacerbate the risk.
The process of perspiration is vital for the human body to get rid of excess warmth by allowing sweat to evaporate. Heightened relative humidity interferes with the body's usual cooling mechanism by reducing evaporation, subsequently decreasing the body's cooling rate and increasing the sensation of heat. Elevated heat gain compared to the body's release capability poses risks of dehydration and potential overheating.

Humidity

In September, the average relative humidity is 87%.

Rainfall

In Luang Prabang, during September, the rain falls for 12 days and regularly aggregates up to 173mm (6.81") of precipitation. In Luang Prabang, during the entire year, the rain falls for 99 days and collects up to 1443mm (56.81") of precipitation.

Daylight

In September, the average length of the day is 12h and 16min.
On the first day of September, sunrise is at 05:55 and sunset at 18:26. On the last day of the month, sunrise is at 06:02 and sunset at 18:00 +07.

Sunshine

In September, the average sunshine is 6h.

UV index

The months with the highest UV index are March through September, with an average maximum UV index of 12. A UV Index estimate of 11, and higher, represents an excessive health risk from exposure to the Sun's UV rays for ordinary individuals.
Note: In September, a regular UV index of 12 translates into these guidelines:
Undertake all critical precautions. Protection from sun harm is vital. It's important to stay in the shade and limit exposure to the sun from 10 a.m. to 4 p.m., when UV radiation is most intense, although remember that shade structures may not provide full sun protection. A hat with a broad brim is indispensable, filtering out up to half of UV rays. Applying and reapplying a broad-spectrum sunscreen with a minimum SPF 30 after every two hours, outdoor workout, or swim is recommended.