September Weather in Modderfontein, South Africa

Last updated: August 31, 2025

In September, the average temperature in Modderfontein, South Africa hovers around 18°C (65°F), making it a pleasant time to explore. However, be prepared for temperature swings, with minimums dipping to 1°C (35°F) and maximums soaring to 33°C (91°F). During this month, expect 7 mm (0.3 in) of precipitation over just 2 days, and enjoy an average humidity level of 74%, creating a comfortable atmosphere for outdoor activities.

September Temperature in Modderfontein

In September in Modderfontein, the average temperature is 18°C (65°F). Maximums can reach 33°C (91°F), and minimums can drop as low as 1°C (35°F). This makes Modderfontein a great destination for travelers looking for mild to warm weather, but it's essential to be prepared for a wide range of temperatures.

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

The chart illustrates September temperature patterns in Modderfontein, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Modderfontein, September typically has an average temperature of 18°C (65°F), with highs reaching up to 33°C (91°F) and lows dropping to around 1°C (35°F).

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

September Precipitation in Modderfontein

In Modderfontein in September, the precipitation amount is 7 mm (0.3 in) over a period of 2 days.

September Precipitation Trends in Modderfontein

The chart displays monthly precipitation patterns in Modderfontein, 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 Modderfontein, September typically receives around 7 mm (0.3 inches) of precipitation spread over approximately 2 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 Modderfontein

In Modderfontein in September humidity is 74%. With an average temperature of 18°C (65°F), this humidity feels like a warm, sticky embrace that can make even short walks feel laborious, leading travelers to seek shade and refreshment more often.

September Average Humidity in Modderfontein

This chart illustrates the average monthly humidity levels in Modderfontein, 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 Modderfontein 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 Modderfontein

In Modderfontein 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 Modderfontein.

Maximum UV Index Levels in Modderfontein for September

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

Data source: Modderfontein 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 Modderfontein Compares to Other Months

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

This table compares monthly weather conditions in Modderfontein, 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)	115 mm (4.5 inches)	79%	extreme
February Weather	21°C (69°F)	126 mm (4.9 inches)	77%	extreme
March Weather	20°C (68°F)	68 mm (2.7 inches)	77%	extreme
April Weather	17°C (63°F)	49 mm (1.9 inches)	81%	very high
May Weather	14°C (58°F)	11 mm (0.4 inches)	82%	high
June Weather	11°C (53°F)	6 mm (0.2 inches)	73%	high
July Weather	11°C (52°F)	2 mm (0.1 inches)	71%	high
August Weather	14°C (58°F)	3 mm (0.1 inches)	68%	very high
September Weather	18°C (65°F)	7 mm (0.3 inches)	74%	extreme
October Weather	19°C (67°F)	54 mm (2.1 inches)	74%	extreme
November Weather	21°C (69°F)	77 mm (3.0 inches)	82%	extreme
December Weather	21°C (69°F)	140 mm (5.5 inches)	81%	extreme