September Weather in Si Nakhon, Thailand

Last updated: August 27, 2025

In Si Nakhon, Thailand, the average temperature in September is a warm 29°C (85°F). Expect a range that can dip to a minimum of 24°C (76°F) and soar to a maximum of 37°C (99°F). With an average precipitation of 239 mm (9.4 in) spread over 23 days, it's a good idea to carry an umbrella! The humidity is quite high at 84%, making it feel even warmer.

September Temperature in Si Nakhon

In September in Si Nakhon, the average temperature is 29°C (85°F). The maximum can reach 37°C (99°F) and the minimum can be as low as 24°C (76°F). It's an ideal time for travelers to enjoy warm weather while exploring the vibrant surroundings.

September Weather in Si Nakhon: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Si Nakhon, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Si Nakhon, September typically has an average temperature of 29°C (85°F), with highs reaching up to 37°C (99°F) and lows dropping to around 24°C (76°F).

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

September Precipitation in Si Nakhon

In Si Nakhon in September, the total precipitation amount is 239 mm (9.4 in), occurring over the course of 23 days.

September Precipitation Trends in Si Nakhon

The chart displays monthly precipitation patterns in Si Nakhon, 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 Si Nakhon, September typically receives around 239 mm (9.4 inches) of precipitation spread over approximately 23 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 Si Nakhon

In Si Nakhon in September humidity is 84%. With an average temperature of 29°C (85°F), this humidity feels like a warm, tropical embrace that clings to your skin, making every step feel heavier and more laborious while traveling.

September Average Humidity in Si Nakhon

This chart illustrates the average monthly humidity levels in Si Nakhon, 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 Si Nakhon is approximately 84%, 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 Si Nakhon

In Si Nakhon 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 Si Nakhon, you can check here.

Maximum UV Index Levels in Si Nakhon for September

The chart shows the monthly maximum UV Index (UVI) for Si Nakhon 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 Si Nakhon typically reaches 14, which falls under the extreme exposure category.

Data source: Si Nakhon 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 Si Nakhon Compares to Other Months

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

This table compares monthly weather conditions in Si Nakhon, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	26°C (78°F)	26 mm (1.0 inches)	51%	very high
February Weather	27°C (81°F)	13 mm (0.5 inches)	48%	extreme
March Weather	31°C (88°F)	7 mm (0.3 inches)	45%	extreme
April Weather	32°C (90°F)	82 mm (3.2 inches)	49%	extreme
May Weather	32°C (89°F)	171 mm (6.7 inches)	71%	extreme
June Weather	30°C (87°F)	211 mm (8.3 inches)	84%	extreme
July Weather	30°C (86°F)	226 mm (8.9 inches)	84%	extreme
August Weather	29°C (85°F)	319 mm (12.6 inches)	87%	extreme
September Weather	29°C (85°F)	239 mm (9.4 inches)	84%	extreme
October Weather	29°C (84°F)	150 mm (5.9 inches)	71%	extreme
November Weather	28°C (83°F)	24 mm (0.9 inches)	62%	very high
December Weather	25°C (78°F)	14 mm (0.6 inches)	55%	very high