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December Weather in Arroyo Grande, United States

Last updated: June 24, 2025

In December, the average temperature in Arroyo Grande, United States hovers around 12°C (54°F). Expect a minimum of 5°C (41°F) and delightful highs of up to 23°C (74°F). This month sees about 72 mm (2.8 in) of precipitation over 6 days, with an average humidity level of 76%.

December Temperature in Arroyo Grande

In December in Arroyo Grande, the average temperature is 12°C (54°F). The maximum can reach 23°C (74°F) and the minimum can be as low as 5°C (41°F). It's a great time to visit for those who enjoy mild weather and outdoor activities.

December Weather in Arroyo Grande: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Arroyo Grande, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Arroyo Grande, December typically has an average temperature of 12°C (54°F), with highs reaching up to 23°C (74°F) and lows dropping to around 5°C (41°F).
JanFebMarAprMayJunJulAugSepOctNovDec545354565761646464635854
Data source: Temperature data for Arroyo Grande 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 Arroyo Grande

In Arroyo Grande in December, the total precipitation amount is 72 mm (2.8 in) over the course of 6 days.

December Precipitation Trends in Arroyo Grande

The chart displays monthly precipitation patterns in Arroyo Grande, 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 Arroyo Grande, December typically receives around 72 mm (2.8 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec100818824122112103372
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Arroyo Grande

In Arroyo Grande in December, humidity is 76%. With an average temperature of 12°C (54°F), this humidity feels like a heavy blanket enveloping you, making outdoor activities a bit uncomfortable and requiring frequent hydration while exploring.

December Average Humidity in Arroyo Grande

This chart illustrates the average monthly humidity levels in Arroyo Grande, 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 Arroyo Grande is approximately 76%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec80%83%80%76%75%74%75%72%70%70%74%77%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Arroyo Grande

In Arroyo Grande 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 Arroyo Grande, you can check the information here.

Maximum UV Index Levels in Arroyo Grande for December

The chart shows the monthly maximum UV Index (UVI) for Arroyo Grande 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 Arroyo Grande typically reaches 3, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec468101112121110753
Data source: Arroyo Grande 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 Arroyo Grande Compares to Other Months

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

This table compares monthly weather conditions in Arroyo Grande, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather12°C (54°F)100 mm (3.9 inches)80%moderate
February Weather12°C (53°F)81 mm (3.2 inches)83%high
March Weather12°C (54°F)88 mm (3.5 inches)80%very high
April Weather13°C (57°F)24 mm (1.0 inches)76%very high
May Weather14°C (58°F)12 mm (0.5 inches)75%extreme
June Weather16°C (61°F)2 mm (0.1 inches)74%extreme
July Weather18°C (64°F)1 mm (0.0 inches)75%extreme
August Weather18°C (65°F)1 mm (0.0 inches)72%extreme
September Weather18°C (64°F)1 mm (0.1 inches)70%very high
October Weather17°C (63°F)10 mm (0.4 inches)70%high
November Weather14°C (58°F)33 mm (1.3 inches)74%moderate
December Weather12°C (54°F)72 mm (2.8 inches)76%moderate

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