September Weather in Si That, Thailand

Last updated: August 27, 2025

In Si That, Thailand, the average temperature in September reaches a warm 28°C (83°F), making it a delightful time to explore. Daily temperatures can range from a comfortable 23°C (73°F) to a sizzling 35°C (95°F). However, be prepared for occasional rain, as the area experiences 223 mm (8.8 in) of precipitation over approximately 23 days. With an average humidity of 86%, the air will feel quite tropical!

September Temperature in Si That

In September in Si That, the average temperature is 28°C (83°F), with maximums reaching 35°C (95°F) and minimums dropping to as low as 23°C (73°F). This warm climate makes Si That an ideal destination for sun-seekers and outdoor enthusiasts.

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

The chart illustrates September temperature patterns in Si That, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Si That, September typically has an average temperature of 28°C (83°F), with highs reaching up to 35°C (95°F) and lows dropping to around 23°C (73°F).

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

September Precipitation in Si That

In Si That in September, the total precipitation amount reaches 223 mm (8.8 in) over the course of 23 days.

September Precipitation Trends in Si That

The chart displays monthly precipitation patterns in Si That, 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 That, September typically receives around 223 mm (8.8 inches) of precipitation spread over approximately 23 days.

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

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Millimeters (mm) Inches (in)

September Humidity in Si That

In Si That in September humidity is 86%. With an average temperature of 28°C (83°F), this humidity feels like a heavy blanket enveloping you, making every step feel sluggish and every breath a reminder of the tropical heat, which can be quite challenging for traveling.

September Average Humidity in Si That

This chart illustrates the average monthly humidity levels in Si That, 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 That is approximately 86%, 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 That

In Si That 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 That, you can check here.

Maximum UV Index Levels in Si That for September

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

Data source: Si That 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 That Compares to Other Months

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

This table compares monthly weather conditions in Si That, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	24°C (75°F)	4 mm (0.2 inches)	59%	very high
February Weather	25°C (77°F)	14 mm (0.6 inches)	54%	extreme
March Weather	28°C (83°F)	36 mm (1.4 inches)	45%	extreme
April Weather	29°C (85°F)	80 mm (3.1 inches)	40%	extreme
May Weather	29°C (85°F)	167 mm (6.6 inches)	65%	extreme
June Weather	29°C (85°F)	157 mm (6.2 inches)	82%	extreme
July Weather	29°C (84°F)	266 mm (10.5 inches)	90%	extreme
August Weather	28°C (83°F)	235 mm (9.3 inches)	92%	extreme
September Weather	28°C (83°F)	223 mm (8.8 inches)	86%	extreme
October Weather	27°C (81°F)	117 mm (4.6 inches)	80%	extreme
November Weather	26°C (79°F)	17 mm (0.7 inches)	72%	very high
December Weather	23°C (74°F)	6 mm (0.2 inches)	66%	very high