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September Weather in Orkney, South Africa

Last updated: August 31, 2025

In Orkney, South Africa, the average temperature in September hovers around 19°C (66°F). While you might experience a chilly minimum of -1°C (31°F), it can also soar to a maximum of 34°C (94°F). Expect approximately 6 mm (0.2 in) of precipitation over just 2 days this month, with average humidity levels around 56%. Enjoy the diverse climate!

September Temperature in Orkney

In September in Orkney, the average temperature is 19°C (66°F), with maximums reaching up to 34°C (94°F) and minimums dropping as low as -1°C (31°F). This varied climate makes Orkney an ideal destination for travelers seeking both warm and cool experiences.

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

The chart illustrates September temperature patterns in Orkney, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Orkney, September typically has an average temperature of 19°C (66°F), with highs reaching up to 34°C (94°F) and lows dropping to around -1°C (31°F).
JanFebMarAprMayJunJulAugSepOctNovDec747270645752515865707273
Data source: Temperature data for Orkney 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 Orkney

In Orkney in September, the precipitation amount is 6 mm (0.2 in) over the course of 2 days.

September Precipitation Trends in Orkney

The chart displays monthly precipitation patterns in Orkney, 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 Orkney, September typically receives around 6 mm (0.2 inches) of precipitation spread over approximately 2 days.
JanFebMarAprMayJunJulAugSepOctNovDec941045359682564074123
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Orkney

In Orkney in September humidity is 56%. With an average temperature of 19°C (66°F), this humidity feels like a comfortable blanket wrapping around you, making it pleasant for traveling and exploring, as long as you're prepared for a slight stickiness in the air.

September Average Humidity in Orkney

This chart illustrates the average monthly humidity levels in Orkney, 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 Orkney is approximately 56%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec71%71%74%75%70%65%59%56%56%54%59%67%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Orkney

In Orkney 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 Orkney.

Maximum UV Index Levels in Orkney for September

The chart shows the monthly maximum UV Index (UVI) for Orkney 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 Orkney typically reaches 11, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec16151311756811131516
Data source: Orkney 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 Orkney Compares to Other Months

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

This table compares monthly weather conditions in Orkney, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather23°C (74°F)94 mm (3.7 inches)71%extreme
February Weather22°C (73°F)104 mm (4.1 inches)70%extreme
March Weather21°C (70°F)53 mm (2.1 inches)74%extreme
April Weather18°C (64°F)59 mm (2.3 inches)75%extreme
May Weather14°C (58°F)6 mm (0.2 inches)70%high
June Weather11°C (52°F)8 mm (0.3 inches)65%moderate
July Weather10°C (51°F)2 mm (0.1 inches)59%high
August Weather14°C (58°F)4 mm (0.2 inches)56%very high
September Weather19°C (66°F)6 mm (0.2 inches)56%extreme
October Weather21°C (70°F)40 mm (1.6 inches)54%extreme
November Weather22°C (73°F)74 mm (2.9 inches)59%extreme
December Weather23°C (74°F)123 mm (4.8 inches)67%extreme

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