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December Weather in Sequim, United States

Last updated: June 24, 2025

In Sequim, United States, the average temperature in December hovers around 3°C (38°F), with a minimum dipping to -11°C (13°F) and a maximum reaching up to 11°C (52°F). Expect considerable moisture, as precipitation averages 193 mm (7.6 in) over 20 days, while humidity remains high at 87%.

December Temperature in Sequim

In December in Sequim, the average temperature is 3°C (38°F), with maximums reaching 11°C (52°F) and minimums dropping as low as -11°C (13°F). Travelers should be prepared for chilly weather and dress in layers to stay warm.

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

The chart illustrates December temperature patterns in Sequim, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sequim, December typically has an average temperature of 3°C (38°F), with highs reaching up to 11°C (52°F) and lows dropping to around -11°C (13°F).
JanFebMarAprMayJunJulAugSepOctNovDec383639445155606156474238
Data source: Temperature data for Sequim 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 Sequim

In Sequim in December, the precipitation amount is 193 mm (7.6 in) spread over a total of 20 days.

December Precipitation Trends in Sequim

The chart displays monthly precipitation patterns in Sequim, 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 Sequim, December typically receives around 193 mm (7.6 inches) of precipitation spread over approximately 20 days.
JanFebMarAprMayJunJulAugSepOctNovDec182151128119931184945123143199193
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Sequim

In Sequim in December humidity is 87%. With an average temperature of 3°C (38°F), this humidity feels like a chilly blanket wrapped around you, making travel quite uncomfortable as the cold dampness seeps into your clothes and lingers in the air, often leaving you shivering and longing for warmer, drier conditions.

December Average Humidity in Sequim

This chart illustrates the average monthly humidity levels in Sequim, 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 Sequim is approximately 87%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%84%85%83%84%84%82%73%74%83%86%87%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Sequim

In Sequim in December, the maximum UV index is 2, which corresponds to a low exposure category. With this level of UV radiation, the time to burn is approximately 45 minutes. To learn more about the hourly UV index in Sequim, you can visit Hourly UV Index in Sequim.

Maximum UV Index Levels in Sequim for December

The chart shows the monthly maximum UV Index (UVI) for Sequim 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 Sequim typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec235689987532
Data source: Sequim 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 Sequim Compares to Other Months

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

This table compares monthly weather conditions in Sequim, showing how December’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather3°C (38°F)182 mm (7.2 inches)86%low
February Weather2°C (36°F)150 mm (5.9 inches)84%moderate
March Weather4°C (40°F)128 mm (5.1 inches)85%moderate
April Weather7°C (44°F)119 mm (4.7 inches)83%high
May Weather11°C (51°F)93 mm (3.7 inches)84%very high
June Weather13°C (56°F)118 mm (4.6 inches)84%very high
July Weather15°C (60°F)49 mm (1.9 inches)82%very high
August Weather16°C (61°F)45 mm (1.8 inches)73%very high
September Weather13°C (56°F)122 mm (4.8 inches)74%high
October Weather9°C (48°F)143 mm (5.6 inches)83%moderate
November Weather6°C (42°F)199 mm (7.8 inches)86%moderate
December Weather3°C (38°F)193 mm (7.6 inches)87%low

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