September Weather in Si Thep, Thailand

Last updated: August 27, 2025

The average temperature in Si Thep, Thailand during September is a warm 28°C (83°F). Temperatures can range from a minimum of 24°C (75°F) to a balmy maximum of 36°C (96°F). Expect plenty of rain, with an average precipitation amount of 251 mm (9.9 in) spread over 24 days, and enjoy the tropical feel with an average humidity of 88%.

September Temperature in Si Thep

In September in Si Thep, the average temperature is 28°C (83°F), with maximums reaching 36°C (96°F) and minimums dropping to as low as 24°C (75°F). This pleasant climate makes Si Thep an ideal destination for travelers seeking warm weather and enjoyable outdoor activities.

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

The chart illustrates September temperature patterns in Si Thep, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Si Thep, September typically has an average temperature of 28°C (83°F), with highs reaching up to 36°C (96°F) and lows dropping to around 24°C (75°F).

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

September Precipitation in Si Thep

In Si Thep in September, the precipitation amount is 251 mm (9.9 in) over the course of 24 days.

September Precipitation Trends in Si Thep

The chart displays monthly precipitation patterns in Si Thep, 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 Thep, September typically receives around 251 mm (9.9 inches) of precipitation spread over approximately 24 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 Thep

In Si Thep in September, humidity is 88%. With an average temperature of 28°C (83°F), this humidity feels like stepping into a warm, dense mist that clings to your skin, making outdoor activities noticeably more taxing and promoting a sense of sluggishness that can hinder your travel plans.

September Average Humidity in Si Thep

This chart illustrates the average monthly humidity levels in Si Thep, 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 Thep is approximately 88%, 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 Thep

In Si Thep in September, the maximum UV index reaches 13, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's crucial to take protective measures. For detailed information, you can check the Hourly UV Index in Si Thep.

Maximum UV Index Levels in Si Thep for September

The chart shows the monthly maximum UV Index (UVI) for Si Thep 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 Thep typically reaches 13, which falls under the extreme exposure category.

Data source: Si Thep 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 Thep Compares to Other Months

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

This table compares monthly weather conditions in Si Thep, 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 (80°F)	7 mm (0.3 inches)	50%	very high
February Weather	27°C (82°F)	18 mm (0.7 inches)	47%	extreme
March Weather	30°C (86°F)	30 mm (1.2 inches)	41%	extreme
April Weather	30°C (87°F)	83 mm (3.3 inches)	51%	extreme
May Weather	30°C (86°F)	130 mm (5.1 inches)	76%	extreme
June Weather	30°C (86°F)	159 mm (6.3 inches)	83%	extreme
July Weather	29°C (84°F)	245 mm (9.6 inches)	80%	extreme
August Weather	28°C (83°F)	266 mm (10.5 inches)	85%	extreme
September Weather	28°C (83°F)	251 mm (9.9 inches)	88%	extreme
October Weather	28°C (83°F)	177 mm (7.0 inches)	79%	extreme
November Weather	27°C (82°F)	15 mm (0.6 inches)	68%	very high
December Weather	26°C (79°F)	7 mm (0.3 inches)	59%	very high