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December Weather in Valparaiso, United States

Last updated: June 24, 2025

In Valparaiso, United States, the average temperature in December hovers around 14°C (57°F). During this time, you can expect minimum temperatures to dip to 1°C (33°F), while maximums can soar up to 25°C (78°F). Prepare for some wet days, as 123 mm (4.9 in) of precipitation typically falls over 10 days, accompanied by an average humidity of 86%.

December Temperature in Valparaiso

In December in Valparaiso, the average temperature is 14°C (57°F), with a maximum that can reach 25°C (78°F) and a minimum that can drop as low as 1°C (33°F). This range makes it an ideal time for travelers to enjoy mild weather while being prepared for both warmer and cooler conditions.

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

The chart illustrates December temperature patterns in Valparaiso, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Valparaiso, December typically has an average temperature of 14°C (57°F), with highs reaching up to 25°C (78°F) and lows dropping to around 1°C (33°F).
JanFebMarAprMayJunJulAugSepOctNovDec545964687581828280746157
Data source: Temperature data for Valparaiso 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 Valparaiso

In Valparaiso in December, the total precipitation amount is 123 mm (4.9 in) over the course of 10 days.

December Precipitation Trends in Valparaiso

The chart displays monthly precipitation patterns in Valparaiso, 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 Valparaiso, December typically receives around 123 mm (4.9 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec90112621299619016517714711840123
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Valparaiso

In Valparaiso in December humidity is 86%. With an average temperature of 14°C (57°F), this humidity feels like a heavy blanket enveloping you, making travel feel oppressive and uncomfortably sticky.

December Average Humidity in Valparaiso

This chart illustrates the average monthly humidity levels in Valparaiso, 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 Valparaiso is approximately 86%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec83%82%79%77%74%70%78%78%79%74%83%86%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Valparaiso

In Valparaiso in December, the maximum UV index reaches 4, which corresponds to a moderate Exposure Category. With a time to burn of 30 minutes, it’s important to take precautions to protect your skin. You can find more details in the Hourly UV Index in Valparaiso for better planning.

Maximum UV Index Levels in Valparaiso for December

The chart shows the monthly maximum UV Index (UVI) for Valparaiso 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 Valparaiso typically reaches 4, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec589111111121110864
Data source: Valparaiso 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 Valparaiso Compares to Other Months

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

This table compares monthly weather conditions in Valparaiso, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather12°C (54°F)89 mm (3.5 inches)83%moderate
February Weather15°C (60°F)112 mm (4.4 inches)82%very high
March Weather18°C (64°F)62 mm (2.4 inches)79%very high
April Weather20°C (68°F)129 mm (5.1 inches)77%extreme
May Weather24°C (76°F)96 mm (3.8 inches)74%extreme
June Weather27°C (81°F)190 mm (7.5 inches)70%extreme
July Weather28°C (82°F)165 mm (6.5 inches)78%extreme
August Weather28°C (82°F)177 mm (7.0 inches)78%extreme
September Weather26°C (80°F)147 mm (5.8 inches)79%very high
October Weather23°C (74°F)118 mm (4.7 inches)74%very high
November Weather16°C (61°F)40 mm (1.6 inches)83%high
December Weather14°C (57°F)123 mm (4.9 inches)86%moderate

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