September Weather in Phonthong, Laos

Last updated: August 23, 2025

In September, the average temperature in Phonthong, Laos is a warm 27°C (81°F). Expect a minimum of 22°C (72°F) and a maximum of 34°C (93°F), making it a pleasant time to explore. However, prepare for 347 mm (13.7 in) of precipitation over 26 days, resulting in an average humidity of 91%. Stay hydrated and enjoy the lush surroundings!

September Temperature in Phonthong

In September in Phonthong, the average temperature is 27°C (81°F). Maximum temperatures can reach 34°C (93°F), while the minimum can drop to as low as 22°C (72°F). Overall, this makes Phonthong a warm and pleasant destination, perfect for travelers looking to enjoy the sun.

September Weather in Phonthong: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Phonthong, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Phonthong, September typically has an average temperature of 27°C (81°F), with highs reaching up to 34°C (93°F) and lows dropping to around 22°C (72°F).

Data source: Temperature data for Phonthong generated using information from the Copernicus Climate Change Service.

September Precipitation in Phonthong

In Phonthong in September, the total precipitation amount is 347 mm (13.7 in) spread over 26 days.

September Precipitation Trends in Phonthong

The chart displays monthly precipitation patterns in Phonthong, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Phonthong, September typically receives around 347 mm (13.7 inches) of precipitation spread over approximately 26 days.

Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

September Humidity in Phonthong

In Phonthong in September, humidity is 91%. With an average temperature of 27°C (81°F), this humidity feels like a warm, thick haze wrapping around you, making travel feel sluggish and the air heavy, damp with the scent of earth and greenery, which can be both enchanting and exhausting.

September Average Humidity in Phonthong

This chart illustrates the average monthly humidity levels in Phonthong, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Phonthong is approximately 91%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Phonthong

In Phonthong in September, the maximum UV index is 14, which corresponds to an extreme Exposure Category. The time to burn is just 10 minutes, so it's crucial to take precautions. For the detailed hourly UV index in Phonthong, you can check here.

Maximum UV Index Levels in Phonthong for September

The chart shows the monthly maximum UV Index (UVI) for Phonthong in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in Phonthong typically reaches 14, which falls under the extreme exposure category.

Data source: Phonthong September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

Extreme (11+): Avoid the sun, stay in shade.
Very High (8-10): Limit sun exposure.
High (6-7): Use SPF 30+ and protective clothing.
Moderate (3-5): Midday shade recommended.
Low (0-2): No protection needed.

How September Weather in Phonthong Compares to Other Months

Weather in Phonthong varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Phonthong, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Phonthong, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	25°C (78°F)	2 mm (0.1 inches)	74%	very high
February Weather	26°C (79°F)	3 mm (0.1 inches)	65%	extreme
March Weather	29°C (84°F)	21 mm (0.8 inches)	53%	extreme
April Weather	29°C (85°F)	50 mm (2.0 inches)	49%	extreme
May Weather	29°C (84°F)	131 mm (5.2 inches)	72%	extreme
June Weather	28°C (82°F)	282 mm (11.1 inches)	86%	extreme
July Weather	27°C (81°F)	467 mm (18.4 inches)	91%	extreme
August Weather	27°C (81°F)	427 mm (16.8 inches)	93%	extreme
September Weather	27°C (81°F)	347 mm (13.7 inches)	91%	extreme
October Weather	27°C (80°F)	208 mm (8.2 inches)	88%	extreme
November Weather	26°C (79°F)	37 mm (1.5 inches)	85%	very high
December Weather	25°C (77°F)	7 mm (0.3 inches)	82%	very high