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September Weather in Llano, United States

Last updated: June 24, 2025

In Llano, United States, the average temperature in September is a pleasant 26°C (80°F). However, be prepared for temperature fluctuations, with minimums dropping to 8°C (48°F) and maximums soaring to 39°C (102°F). During this month, expect about 73 mm (2.9 in) of precipitation spread over 7 days, accompanied by an average humidity of 66%.

September Temperature in Llano

In September in Llano, the average temperature is 26°C (80°F). Maximums can reach 39°C (102°F), while minimums can dip as low as 8°C (48°F). This range of temperatures makes Llano a perfect destination for travelers seeking a mix of warm days and cool nights.

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

The chart illustrates September temperature patterns in Llano, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Llano, September typically has an average temperature of 26°C (80°F), with highs reaching up to 39°C (102°F) and lows dropping to around 8°C (48°F).
JanFebMarAprMayJunJulAugSepOctNovDec505262687682868679695954
Data source: Temperature data for Llano 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 Llano

In Llano in September, the precipitation amount is 73 mm (2.9 in) during a span of 7 days.

September Precipitation Trends in Llano

The chart displays monthly precipitation patterns in Llano, 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 Llano, September typically receives around 73 mm (2.9 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec4253688113047405073923139
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Llano

In Llano in September humidity is 66%. With an average temperature of 26°C (80°F), this humidity feels like a warm, sticky embrace, making travel a bit challenging as you might find yourself needing frequent breaks to cool down and stay hydrated.

September Average Humidity in Llano

This chart illustrates the average monthly humidity levels in Llano, 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 Llano is approximately 66%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec78%78%77%78%82%78%69%63%66%73%84%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Llano

In Llano 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 Llano.

Maximum UV Index Levels in Llano for September

The chart shows the monthly maximum UV Index (UVI) for Llano 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 Llano typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec579111112121110864
Data source: Llano 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 Llano Compares to Other Months

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

This table compares monthly weather conditions in Llano, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather10°C (50°F)42 mm (1.7 inches)78%moderate
February Weather11°C (52°F)53 mm (2.1 inches)78%high
March Weather17°C (63°F)68 mm (2.7 inches)77%very high
April Weather20°C (68°F)81 mm (3.2 inches)78%extreme
May Weather24°C (76°F)130 mm (5.1 inches)82%extreme
June Weather28°C (82°F)47 mm (1.8 inches)78%extreme
July Weather30°C (86°F)40 mm (1.6 inches)69%extreme
August Weather30°C (86°F)50 mm (2.0 inches)63%extreme
September Weather26°C (80°F)73 mm (2.9 inches)66%very high
October Weather21°C (70°F)92 mm (3.6 inches)73%very high
November Weather15°C (59°F)31 mm (1.2 inches)84%high
December Weather12°C (54°F)39 mm (1.5 inches)87%moderate

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