September Weather in Heilbron, South Africa

Last updated: August 31, 2025

In September, the average temperature in Heilbron, South Africa hovers around 17°C (63°F). Expect temperatures to range from a chilly -1°C (31°F) to a warm 32°C (91°F). During this time, precipitation is relatively low, with around 7 mm (0.3 in) expected over 2 days. Additionally, you can anticipate an average humidity level of 74%, creating a moderately humid atmosphere.

September Temperature in Heilbron

In September in Heilbron, the average temperature is 17°C (63°F). Maximums can reach 32°C (91°F), and minimums can be as low as -1°C (31°F). This variation means travelers should be prepared for both warm days and cooler evenings when visiting.

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

The chart illustrates September temperature patterns in Heilbron, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Heilbron, September typically has an average temperature of 17°C (63°F), with highs reaching up to 32°C (91°F) and lows dropping to around -1°C (31°F).

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

September Precipitation in Heilbron

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

September Precipitation Trends in Heilbron

The chart displays monthly precipitation patterns in Heilbron, 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 Heilbron, 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 Heilbron

In Heilbron 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 Heilbron

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

In Heilbron 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 Heilbron.

Maximum UV Index Levels in Heilbron for September

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

Data source: Heilbron 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 Heilbron Compares to Other Months

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

This table compares monthly weather conditions in Heilbron, 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)	109 mm (4.3 inches)	79%	extreme
February Weather	21°C (70°F)	114 mm (4.5 inches)	77%	extreme
March Weather	20°C (67°F)	70 mm (2.8 inches)	77%	extreme
April Weather	16°C (62°F)	66 mm (2.6 inches)	81%	extreme
May Weather	13°C (56°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)	3 mm (0.1 inches)	71%	high
August Weather	13°C (56°F)	7 mm (0.3 inches)	68%	very high
September Weather	17°C (63°F)	7 mm (0.3 inches)	74%	extreme
October Weather	19°C (66°F)	53 mm (2.1 inches)	74%	extreme
November Weather	20°C (69°F)	91 mm (3.6 inches)	82%	extreme
December Weather	21°C (69°F)	160 mm (6.3 inches)	81%	extreme