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September Weather in Hartswater, South Africa

Last updated: August 31, 2025

In September, the average temperature in Hartswater, South Africa hovers around 18°C (65°F), creating a pleasant climate for outdoor activities. However, be prepared for fluctuations, with temperatures dipping as low as -1°C (30°F) and soaring up to 35°C (96°F). Expect a light drizzle, with 6 mm (0.2 in) of precipitation spread over just 1 day. The average humidity is around 40%, adding to the comfortable ambiance.

September Temperature in Hartswater

In September in Hartswater, the average temperature is 18°C (65°F). Maximum temperatures can reach 35°C (96°F), while minimums can drop as low as -1°C (30°F). This diverse temperature range makes Hartswater a suitable destination for travelers seeking both warm daytime activities and cooler evenings.

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

The chart illustrates September temperature patterns in Hartswater, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Hartswater, September typically has an average temperature of 18°C (65°F), with highs reaching up to 35°C (96°F) and lows dropping to around -1°C (30°F).
JanFebMarAprMayJunJulAugSepOctNovDec777571655751505564707476
Data source: Temperature data for Hartswater generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Hartswater

In Hartswater in September, the precipitation amount is 6 mm (0.2 in) over the course of 1 day.

September Precipitation Trends in Hartswater

The chart displays monthly precipitation patterns in Hartswater, 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 Hartswater, September typically receives around 6 mm (0.2 inches) of precipitation spread over approximately 1 days.
JanFebMarAprMayJunJulAugSepOctNovDec811175973434116252677
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Hartswater

In Hartswater in September humidity is 40%. With an average temperature of 18°C (65°F), this humidity feels like a refreshing breeze, making it ideal for exploring the streets and attractions without feeling overheated.

September Average Humidity in Hartswater

This chart illustrates the average monthly humidity levels in Hartswater, 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 Hartswater is approximately 40%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec64%61%70%72%70%60%54%43%40%35%41%54%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Hartswater

In Hartswater 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 Hartswater.

Maximum UV Index Levels in Hartswater for September

The chart shows the monthly maximum UV Index (UVI) for Hartswater 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 Hartswater typically reaches 11, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec15151310756811131416
Data source: Hartswater 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 Hartswater Compares to Other Months

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

This table compares monthly weather conditions in Hartswater, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather25°C (77°F)81 mm (3.2 inches)64%extreme
February Weather24°C (75°F)117 mm (4.6 inches)61%extreme
March Weather22°C (71°F)59 mm (2.3 inches)70%extreme
April Weather18°C (65°F)73 mm (2.9 inches)72%very high
May Weather14°C (57°F)4 mm (0.1 inches)70%high
June Weather11°C (52°F)3 mm (0.1 inches)60%moderate
July Weather10°C (51°F)4 mm (0.1 inches)53%high
August Weather13°C (56°F)11 mm (0.4 inches)43%very high
September Weather18°C (65°F)6 mm (0.2 inches)40%extreme
October Weather21°C (70°F)25 mm (1.0 inches)35%extreme
November Weather23°C (75°F)26 mm (1.0 inches)41%extreme
December Weather25°C (77°F)77 mm (3.0 inches)54%extreme

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