September Weather in Newcastle, South Africa

Last updated: August 31, 2025

In September, the average temperature in Newcastle, South Africa hovers around 18°C (64°F). However, be prepared for fluctuations, with temperatures ranging from a chill of 2°C (37°F) to a warm 35°C (96°F). With 38 mm (1.5 in) of precipitation over about 6 days, it's wise to carry an umbrella. Humidity sits at a comfortable 74%, making this month a mix of mild warmth and occasional rain.

September Temperature in Newcastle

In September in Newcastle, the average temperature is 18°C (64°F). The maximum can reach 35°C (96°F) and the minimum can be as low as 2°C (37°F). This range makes it a great time to experience diverse weather, so be sure to pack accordingly for your travels!

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

The chart illustrates September temperature patterns in Newcastle, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Newcastle, September typically has an average temperature of 18°C (64°F), with highs reaching up to 35°C (96°F) and lows dropping to around 2°C (37°F).

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

September Precipitation in Newcastle

In Newcastle in September, the total precipitation amount is 38 mm (1.5 in) spread over 6 days.

September Precipitation Trends in Newcastle

The chart displays monthly precipitation patterns in Newcastle, 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 Newcastle, September typically receives around 38 mm (1.5 inches) of precipitation spread over approximately 6 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 Newcastle

In Newcastle in September humidity is 74%. With an average temperature of 18°C (64°F), this humidity feels like a warm embrace, making it ideal for leisurely strolls but potentially uncomfortable for extended outdoor activities.

September Average Humidity in Newcastle

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

In Newcastle 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 Newcastle.

Maximum UV Index Levels in Newcastle for September

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

Data source: Newcastle 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 Newcastle Compares to Other Months

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

This table compares monthly weather conditions in Newcastle, 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)	117 mm (4.6 inches)	79%	extreme
February Weather	21°C (70°F)	136 mm (5.3 inches)	77%	extreme
March Weather	20°C (69°F)	101 mm (4.0 inches)	77%	extreme
April Weather	17°C (63°F)	68 mm (2.7 inches)	81%	very high
May Weather	14°C (58°F)	28 mm (1.1 inches)	82%	high
June Weather	12°C (53°F)	9 mm (0.4 inches)	73%	moderate
July Weather	12°C (54°F)	3 mm (0.1 inches)	71%	high
August Weather	15°C (59°F)	22 mm (0.9 inches)	68%	very high
September Weather	18°C (64°F)	38 mm (1.5 inches)	74%	extreme
October Weather	18°C (66°F)	76 mm (3.0 inches)	74%	extreme
November Weather	20°C (68°F)	106 mm (4.2 inches)	82%	extreme
December Weather	21°C (70°F)	161 mm (6.3 inches)	81%	extreme