September Weather in Utrecht, South Africa

Last updated: August 31, 2025

In September, the average temperature in Utrecht, South Africa hovers around 18°C (64°F). However, be prepared for a temperature range that can dip as low as 2°C (35°F) and soar up to a sizzling 35°C (96°F). Rainfall is moderate, with an expected precipitation of 26 mm (1.0 in) spread over approximately 5 days. Despite the warmth, the average humidity remains high at 85%, creating a uniquely humid experience.

September Temperature in Utrecht

In September in Utrecht, the average temperature is 18°C (64°F). Maximum temperatures can reach 35°C (96°F), while the minimum can drop as low as 2°C (35°F). Be prepared for a wide range of temperatures, ensuring you pack both lightweight clothing for the heat and warmer layers for cooler evenings.

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

The chart illustrates September temperature patterns in Utrecht, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Utrecht, 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 (35°F).

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

September Precipitation in Utrecht

In Utrecht in September, the precipitation amount is 26 mm (1.0 in) over the course of 5 days.

September Precipitation Trends in Utrecht

The chart displays monthly precipitation patterns in Utrecht, 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 Utrecht, September typically receives around 26 mm (1.0 inches) of precipitation spread over approximately 5 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 Utrecht

In Utrecht in September, humidity is 85%. With an average temperature of 18°C (64°F), this humidity feels like a muggy blanket enveloping you, making travel a bit heavy and sticky, as the air clings to your skin and every step can feel like wading through molasses.

September Average Humidity in Utrecht

This chart illustrates the average monthly humidity levels in Utrecht, 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 Utrecht is approximately 85%, 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 Utrecht

In Utrecht 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 Utrecht.

Maximum UV Index Levels in Utrecht for September

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

Data source: Utrecht 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 Utrecht Compares to Other Months

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

This table compares monthly weather conditions in Utrecht, 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)	92 mm (3.6 inches)	82%	extreme
February Weather	21°C (70°F)	127 mm (5.0 inches)	81%	extreme
March Weather	20°C (69°F)	83 mm (3.3 inches)	80%	extreme
April Weather	17°C (63°F)	61 mm (2.4 inches)	82%	very high
May Weather	14°C (58°F)	28 mm (1.1 inches)	86%	high
June Weather	12°C (53°F)	8 mm (0.3 inches)	78%	moderate
July Weather	12°C (54°F)	2 mm (0.1 inches)	81%	high
August Weather	15°C (59°F)	15 mm (0.6 inches)	77%	very high
September Weather	18°C (64°F)	26 mm (1.0 inches)	85%	extreme
October Weather	18°C (65°F)	61 mm (2.4 inches)	85%	extreme
November Weather	20°C (68°F)	89 mm (3.5 inches)	85%	extreme
December Weather	21°C (70°F)	130 mm (5.1 inches)	84%	extreme