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December Weather in Austin, United States

Last updated: June 24, 2025

In Austin, United States, the average temperature in December hovers around 4°C (40°F), with extreme fluctuations where temperatures can dip to a brisk -16°C (4°F) or peak at a pleasant 21°C (70°F). Expect 102 mm (4.0 in) of precipitation spread over 9 days, while the average humidity sits at a high 87%, creating a distinctly cool and damp atmosphere.

December Temperature in Austin

In December in Austin, the average temperature is 4°C (40°F). The maximum can reach 21°C (70°F) and the minimum can be as low as -16°C (4°F). Be sure to prepare for a wide range of temperatures if you're planning to travel during this time.

December Weather in Austin: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Austin, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Austin, December typically has an average temperature of 4°C (40°F), with highs reaching up to 21°C (70°F) and lows dropping to around -16°C (4°F).
JanFebMarAprMayJunJulAugSepOctNovDec343847556775787671604440
Data source: Temperature data for Austin 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.

December Precipitation in Austin

In Austin in December, the total precipitation amount is 102 mm (4.0 in) over a span of 9 days.

December Precipitation Trends in Austin

The chart displays monthly precipitation patterns in Austin, with values for each month alongside December’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how December’s conditions compare to those of other months. In Austin, December typically receives around 102 mm (4.0 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec831141361341271379396959795102
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Austin

In Austin in December humidity is 87%. With an average temperature of 4°C (40°F), this humidity feels like an uncomfortable chill that seeps into your bones, making it essential to dress warmly and prepare for damp conditions, which can dampen your spirits while traveling.

December Average Humidity in Austin

This chart illustrates the average monthly humidity levels in Austin, with December’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In December, average humidity in Austin is approximately 87%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%85%86%84%79%82%79%70%69%76%88%87%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Austin

In Austin in December, the maximum UV index is 3, which corresponds to a moderate Exposure Category. The time to burn is approximately 30 minutes. For more details on the hourly UV index in Austin, you can check the information here.

Maximum UV Index Levels in Austin for December

The chart shows the monthly maximum UV Index (UVI) for Austin in December, 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 December, the maximum UV index in Austin typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec357910111098643
Data source: Austin December 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 December Weather in Austin Compares to Other Months

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

This table compares monthly weather conditions in Austin, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather1°C (34°F)83 mm (3.3 inches)87%moderate
February Weather3°C (38°F)114 mm (4.5 inches)85%moderate
March Weather8°C (47°F)136 mm (5.4 inches)86%high
April Weather13°C (55°F)133 mm (5.3 inches)84%very high
May Weather19°C (67°F)127 mm (5.0 inches)79%very high
June Weather24°C (75°F)136 mm (5.4 inches)82%extreme
July Weather26°C (78°F)92 mm (3.6 inches)79%very high
August Weather24°C (76°F)95 mm (3.8 inches)70%very high
September Weather22°C (72°F)95 mm (3.7 inches)69%very high
October Weather15°C (60°F)97 mm (3.8 inches)76%high
November Weather7°C (45°F)94 mm (3.7 inches)88%moderate
December Weather4°C (40°F)102 mm (4.0 inches)87%moderate

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