September Weather in Frankfort, South Africa

Last updated: August 31, 2025

In Frankfort, South Africa, the average temperature in September hovers around 17°C (63°F). You can expect a range from a chilly -1°C (31°F) to a sweltering 33°C (91°F). This month brings about 9 mm (0.3 in) of precipitation over 3 days, with an average humidity of 74%, adding to the overall climate experience. Enjoy your stay!

September Temperature in Frankfort

In September in Frankfort, the average temperature is 17°C (63°F), with maximums reaching up to 33°C (91°F) and minimums dropping as low as -1°C (31°F). Be prepared for a wide range of temperatures, making it essential to pack accordingly for your travels.

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

The chart illustrates September temperature patterns in Frankfort, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Frankfort, September typically has an average temperature of 17°C (63°F), with highs reaching up to 33°C (91°F) and lows dropping to around -1°C (31°F).

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

September Precipitation in Frankfort

In Frankfort in September, the precipitation amount is 9 mm (0.3 in) measured over a span of 3 days.

September Precipitation Trends in Frankfort

The chart displays monthly precipitation patterns in Frankfort, 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 Frankfort, September typically receives around 9 mm (0.3 inches) of precipitation spread over approximately 3 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 Frankfort

In Frankfort in September, humidity is 74%. With an average temperature of 17°C (63°F), this humidity feels like a gentle embrace, making outdoor exploration comfortable yet slightly enveloped in warmth, perfect for leisurely strolls but requiring ample hydration for prolonged activities.

September Average Humidity in Frankfort

This chart illustrates the average monthly humidity levels in Frankfort, 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 Frankfort is approximately 74%, 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 Frankfort

In Frankfort in September, the maximum UV index reaches 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, you can check the Hourly UV Index in Frankfort.

Maximum UV Index Levels in Frankfort for September

The chart shows the monthly maximum UV Index (UVI) for Frankfort 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 Frankfort typically reaches 11, which falls under the extreme exposure category.

Data source: Frankfort 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 Frankfort Compares to Other Months

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

This table compares monthly weather conditions in Frankfort, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	21°C (70°F)	100 mm (3.9 inches)	79%	extreme
February Weather	21°C (69°F)	113 mm (4.5 inches)	77%	extreme
March Weather	19°C (67°F)	71 mm (2.8 inches)	77%	extreme
April Weather	16°C (61°F)	63 mm (2.5 inches)	81%	extreme
May Weather	13°C (55°F)	11 mm (0.4 inches)	82%	high
June Weather	10°C (50°F)	8 mm (0.3 inches)	73%	moderate
July Weather	10°C (50°F)	2 mm (0.1 inches)	71%	high
August Weather	13°C (56°F)	6 mm (0.3 inches)	68%	very high
September Weather	17°C (63°F)	9 mm (0.3 inches)	74%	extreme
October Weather	19°C (66°F)	64 mm (2.5 inches)	74%	extreme
November Weather	20°C (68°F)	105 mm (4.1 inches)	82%	extreme
December Weather	20°C (69°F)	153 mm (6.0 inches)	81%	extreme