September Weather in Sien, Burkina Faso

Last updated: August 22, 2025

In Sien, Burkina Faso, the average temperature in September is a warm 28°C (82°F), with daily highs reaching up to 36°C (98°F) and lows dipping to 21°C (70°F). Expect a significant amount of rainfall, with 127 mm (5.0 in) occurring over 15 days, contributing to the region's average humidity of 83%. Whether you're planning a trip or simply curious about the climate, Sien in September offers a tropical experience!

September Temperature in Sien

In September in Sien, the average temperature is 28°C (82°F), with maximums reaching 36°C (98°F) and minimums dipping to as low as 21°C (70°F). This warm and pleasant climate makes it an ideal destination for travelers seeking sunny weather and outdoor activities.

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

The chart illustrates September temperature patterns in Sien, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sien, September typically has an average temperature of 28°C (82°F), with highs reaching up to 36°C (98°F) and lows dropping to around 21°C (70°F).

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

September Precipitation in Sien

In Sien in September, the total precipitation amount is 127 mm (5.0 in) distributed over 15 days.

September Precipitation Trends in Sien

The chart displays monthly precipitation patterns in Sien, 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 Sien, September typically receives around 127 mm (5.0 inches) of precipitation spread over approximately 15 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 Sien

In Sien in September humidity is 83%. With an average temperature of 28°C (82°F), this humidity feels like stepping into a warm, thick blanket, making travel languid and drenched in sweat.

September Average Humidity in Sien

This chart illustrates the average monthly humidity levels in Sien, 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 Sien is approximately 83%, 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 Sien

In Sien 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 Sien.

Maximum UV Index Levels in Sien for September

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

Data source: Sien 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 Sien Compares to Other Months

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

This table compares monthly weather conditions in Sien, 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 (77°F)	0 mm (0.0 inches)	10%	very high
February Weather	27°C (82°F)	0 mm (0.0 inches)	9%	extreme
March Weather	31°C (89°F)	1 mm (0.0 inches)	11%	extreme
April Weather	33°C (93°F)	5 mm (0.2 inches)	24%	extreme
May Weather	33°C (92°F)	22 mm (0.9 inches)	51%	extreme
June Weather	31°C (87°F)	56 mm (2.2 inches)	75%	extreme
July Weather	28°C (83°F)	141 mm (5.6 inches)	77%	extreme
August Weather	27°C (80°F)	231 mm (9.1 inches)	83%	extreme
September Weather	28°C (82°F)	127 mm (5.0 inches)	83%	extreme
October Weather	29°C (85°F)	39 mm (1.5 inches)	79%	extreme
November Weather	28°C (83°F)	0 mm (0.0 inches)	46%	very high
December Weather	26°C (79°F)	0 mm (0.0 inches)	12%	very high