nomadseason

December Weather in Mejillones, Chile

Last updated: August 22, 2025

In December, the average temperature in Mejillones, Chile is a comfortable 19°C (66°F), with a minimum of 15°C (60°F) and a maximum reaching 23°C (73°F). Prepare for minimal rain, as total precipitation averages 5 mm (0.2 in) over just 0 days. Enjoy the mild weather with an average humidity of 78%, perfect for outdoor activities!

December Temperature in Mejillones

In December in Mejillones, the average temperature is 19°C (66°F). The maximum can reach 23°C (73°F), while the minimum can be as low as 15°C (60°F). This mild climate makes it a perfect time for outdoor activities and exploring the local attractions.

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

The chart illustrates December temperature patterns in Mejillones, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Mejillones, December typically has an average temperature of 19°C (66°F), with highs reaching up to 23°C (73°F) and lows dropping to around 15°C (60°F).
JanFebMarAprMayJunJulAugSepOctNovDec696967646260595858606365
Data source: Temperature data for Mejillones generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

December Precipitation in Mejillones

In Mejillones in December, the precipitation amount is 5 mm (0.2 in) during a span of 0 days.

December Precipitation Trends in Mejillones

The chart displays monthly precipitation patterns in Mejillones, 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 Mejillones, December typically receives around 5 mm (0.2 inches) of precipitation spread over approximately 0 days.
JanFebMarAprMayJunJulAugSepOctNovDec42371014141110875
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

December Humidity in Mejillones

In Mejillones in December, humidity is 78%. With an average temperature of 19°C (66°F), this humidity feels like a warm, enveloping blanket, making traveling quite uncomfortable unless you're well-prepared with lightweight, breathable clothing and frequent breaks to stay hydrated.

December Average Humidity in Mejillones

This chart illustrates the average monthly humidity levels in Mejillones, 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 Mejillones is approximately 78%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec83%84%84%83%80%79%77%75%77%77%79%78%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Mejillones

In Mejillones in December, the maximum UV index reaches an alarming 15, which falls into the extreme Exposure Category. With a time to burn of just 10 minutes, it's crucial to take precautions. For detailed information, you can check the Hourly UV Index in Mejillones.

Maximum UV Index Levels in Mejillones for December

The chart shows the monthly maximum UV Index (UVI) for Mejillones 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 Mejillones typically reaches 15, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec15151310867911141415
Data source: Mejillones 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 Mejillones Compares to Other Months

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

This table compares monthly weather conditions in Mejillones, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather20°C (69°F)4 mm (0.1 inches)83%extreme
February Weather21°C (69°F)1 mm (0.1 inches)84%extreme
March Weather20°C (68°F)3 mm (0.1 inches)84%extreme
April Weather18°C (65°F)7 mm (0.3 inches)83%very high
May Weather17°C (62°F)10 mm (0.4 inches)80%very high
June Weather16°C (60°F)13 mm (0.5 inches)79%high
July Weather15°C (59°F)14 mm (0.5 inches)77%high
August Weather15°C (59°F)11 mm (0.4 inches)75%very high
September Weather15°C (59°F)10 mm (0.4 inches)77%extreme
October Weather15°C (60°F)8 mm (0.3 inches)77%extreme
November Weather17°C (63°F)6 mm (0.3 inches)79%extreme
December Weather19°C (66°F)5 mm (0.2 inches)78%extreme

Compare Mejillones's Climate with Cities Worldwide