December Weather in Arroyo Grande, Mexico

Last updated: August 26, 2025

In Arroyo Grande, Mexico, the average temperature in December is a comfortable 24°C (75°F), with daily fluctuations that can see a minimum of 13°C (55°F) and a peak of 34°C (93°F). Rainfall is modest, averaging just 5 mm (0.2 in) over 1 day, while the atmosphere maintains a relatively high average humidity of 74%. Enjoy the pleasant weather as the month unfolds!

December Temperature in Arroyo Grande

In December in Arroyo Grande, the average temperature is 24°C (75°F). Maximums can reach 34°C (93°F) and minimums can dip as low as 13°C (55°F). This pleasant climate makes it an ideal time for travelers to explore and enjoy 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 24°C (75°F), with highs reaching up to 34°C (93°F) and lows dropping to around 13°C (55°F).

Data source: Temperature data for Arroyo Grande generated using information from the Copernicus Climate Change Service.

December Precipitation in Arroyo Grande

In Arroyo Grande in December, the precipitation amount is 5 mm (0.2 in) over a duration of 1 day.

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 5 mm (0.2 inches) of precipitation spread over approximately 1 days.

Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

December Humidity in Arroyo Grande

In Arroyo Grande in December, humidity is 74%. With an average temperature of 24°C (75°F), this humidity feels like a warm blanket wrapping around you, making outdoor exploration both sticky and exhilarating, as the heat clings to your skin while inviting you to seek out refreshing breezes or cool shade.

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 74%, offering insight into how humid the weather typically is during this month.

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 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Arroyo Grande.

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 8, which falls under the very high exposure category.

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.
	Temperature	Precipitation	Humidity	UV
January Weather	24°C (75°F)	4 mm (0.2 inches)	70%	very high
February Weather	25°C (77°F)	4 mm (0.2 inches)	64%	extreme
March Weather	27°C (81°F)	2 mm (0.1 inches)	54%	extreme
April Weather	28°C (83°F)	1 mm (0.0 inches)	61%	extreme
May Weather	29°C (84°F)	31 mm (1.2 inches)	75%	extreme
June Weather	27°C (81°F)	172 mm (6.8 inches)	83%	extreme
July Weather	26°C (80°F)	177 mm (7.0 inches)	83%	extreme
August Weather	26°C (79°F)	231 mm (9.1 inches)	85%	extreme
September Weather	26°C (78°F)	227 mm (8.9 inches)	85%	extreme
October Weather	26°C (78°F)	146 mm (5.8 inches)	79%	extreme
November Weather	25°C (77°F)	35 mm (1.4 inches)	76%	very high
December Weather	24°C (75°F)	5 mm (0.2 inches)	74%	very high