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September Weather in Flagstaff, South Africa

Last updated: August 31, 2025

In September, the average temperature in Flagstaff, South Africa is a pleasant 16°C (61°F). Expect temperature fluctuations, with minimums dipping to 4°C (39°F) and maximums soaring to an impressive 37°C (99°F). During this month, anticipate around 41 mm (1.6 in) of precipitation over the course of 7 days, and enjoy a high average humidity of 82% for a truly immersive experience!

September Temperature in Flagstaff

In September in Flagstaff, the average temperature is 16°C (61°F). Maximum temperatures can reach up to 37°C (99°F), while minimums can drop as low as 4°C (39°F). Overall, this month offers a range of temperatures, making it essential to pack for both warm and cool conditions while traveling.

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

The chart illustrates September temperature patterns in Flagstaff, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Flagstaff, September typically has an average temperature of 16°C (61°F), with highs reaching up to 37°C (99°F) and lows dropping to around 4°C (39°F).
JanFebMarAprMayJunJulAugSepOctNovDec697068635956555761636467
Data source: Temperature data for Flagstaff 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 Flagstaff

In Flagstaff in September, the precipitation amount is 41 mm (1.6 in) spread over a duration of 7 days.

September Precipitation Trends in Flagstaff

The chart displays monthly precipitation patterns in Flagstaff, 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 Flagstaff, September typically receives around 41 mm (1.6 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec106131968933236384184102120
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Flagstaff

In Flagstaff in September humidity is 82%. With an average temperature of 16°C (61°F), this humidity feels like a heavy blanket enveloping you, making travel feel a bit sluggish and requiring frequent breaks to hydrate and cool down.

September Average Humidity in Flagstaff

This chart illustrates the average monthly humidity levels in Flagstaff, 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 Flagstaff is approximately 82%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%88%89%89%88%82%77%72%82%83%88%88%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Flagstaff

In Flagstaff in September, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Flagstaff.

Maximum UV Index Levels in Flagstaff for September

The chart shows the monthly maximum UV Index (UVI) for Flagstaff 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 Flagstaff typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec1514129645710121316
Data source: Flagstaff 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 Flagstaff Compares to Other Months

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

This table compares monthly weather conditions in Flagstaff, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather21°C (70°F)106 mm (4.2 inches)88%extreme
February Weather21°C (70°F)131 mm (5.2 inches)88%extreme
March Weather20°C (68°F)96 mm (3.8 inches)89%extreme
April Weather17°C (64°F)89 mm (3.5 inches)89%very high
May Weather15°C (60°F)33 mm (1.3 inches)88%high
June Weather13°C (56°F)23 mm (0.9 inches)82%moderate
July Weather13°C (56°F)6 mm (0.2 inches)77%moderate
August Weather14°C (57°F)37 mm (1.5 inches)72%high
September Weather16°C (61°F)41 mm (1.6 inches)82%very high
October Weather17°C (63°F)84 mm (3.3 inches)83%extreme
November Weather18°C (64°F)102 mm (4.0 inches)87%extreme
December Weather19°C (67°F)120 mm (4.7 inches)88%extreme

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