December weather forecast
St. Augustine, FL

As St. Augustine welcomes the winter season, December brings a significant change in the city's weather. The mild chill bracing the air, the shortened daylight hours, and the chilling sea surface temperatures signal the onset of winter. Markedly, December encounters less rainfall with the average tallying up to only 2.4" (61mm), contributing to dry winter days. The sun still shines beautifully, turning the city into a winter wonderland. Overall, St. Augustine's weather in December serves as an elegant curtain closer to a year marked by enticingly diverse climatic patterns.

Temperature

As November transitions into December, St. Augustine sees a gentle drop in the average high-temperature, transitioning from a moderately hot 73.9°F (23.3°C) to an agreeable 68°F (20°C). Nighttime temperatures in St. Augustine hover around an average low of 48.9°F (9.4°C) in December.

Rainfall

In December, in St. Augustine, the rain falls for 7 days. Throughout December, 2.4" (61mm) of precipitation is accumulated. In St. Augustine, during the entire year, the rain falls for 116 days and collects up to 50" (1270mm) of precipitation.

Ocean temperature

In December, the average ocean temperature in St. Augustine is 68.4°F (20.2°C).
Note: Swimming is not a pleasant activity for most when the water temperature is 68.4°F (20.2°C). As the water temperature drops from 69.8°F (21°C) to 59°F (15°C), breathing becomes more difficult to control.

Daylight

December has the shortest days of the year in St. Augustine, with an average of 10h and 18min of daylight.
On the first day of the month, sunrise is at 7:03 am and sunset at 5:25 pm. On the last day of December, in St. Augustine, sunrise is at 7:20 am and sunset at 5:36 pm EST.

Sunshine

The month with the least sunshine in St. Augustine, Florida, is December, with an average of 6h of sunshine.

UV index

January and December, with an average maximum UV index of 4, are months with the lowest UV index in St. Augustine. A UV Index of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV rays for the ordinary person.
Note: In December, the UV index of 4 transforms into the following advice:
Take precautions. Light skin individuals may get burned in less than 30 minutes. Sun's radiation is most powerful around mid-day, so it's best to limit outdoor activities during this time. Protect your eyes, ears, face, and neck from the Sun by wearing a wide-brimmed hat.