December Weather in Saint Simons Island, United States

Last updated: February 24, 2025

December weather on Saint Simons Island presents a mild coastal retreat, with an impressive maximum temperature reaching 22°C (72°F) and an average of 15°C (59°F). Despite the season's chill, where temperatures can dip to a brisk 3°C (37°F), the atmosphere remains generally pleasant. Rainfall is notable, with 121 mm (4.8 in) distributed over approximately 10 days, contributing to the island's lush greenery. An average humidity level of 85% enhances the tropical feel, making December a unique blend of refreshing coolness and damp warmth, ideal for cozy beach walks and exploration.

December Temperature in Saint Simons Island

In December, Saint Simons Island experiences a subtle shift as temperatures begin to cool from the mildness of autumn. With a minimum temperature of 3°C (37°F) and an average of 15°C (59°F), the island welcomes a comfortable chill without retreating into winter's icy grasp. The maximum temperature reaches a pleasant 22°C (72°F), allowing for enjoyable outdoor activities amid the holiday atmosphere. This month signifies a transitional phase, where the cooler temperatures start to emerge, yet the warmth of the region remains inviting, making it an ideal time for visitors seeking a serene coastal escape before the brisk winter sets in.

December Weather in Saint Simons Island: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Saint Simons Island, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec555862687479818180756558
Data source: Temperature data for Saint Simons Island 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 Saint Simons Island

In December, Saint Simons Island experiences a notable uptick in precipitation, with an average of 121 mm (4.8 in) over approximately 10 days of rainfall. This marks an increase from the preceding months, as November saw 99 mm (3.9 in) over just 7 days. The shift towards wetter weather signals the onset of winter, creating a contrast with the drier fall months. Interestingly, the December precipitation aligns with the heavier averages seen earlier in the summer, particularly July and August, which both recorded 136 mm (5.3 in) and 136 mm (5.4 in), respectively. This pattern underscores a seasonal trend where late-year rainfall begins to intensify, contributing to the island's lush landscape as it transitions into the new year.

December Precipitation Trends in Saint Simons Island

The chart displays monthly precipitation patterns in Saint Simons Island, 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.
JanFebMarAprMayJunJulAugSepOctNovDec61936078651031361361668299121
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Saint Simons Island

December on Saint Simons Island sees a notable increase in humidity, with levels soaring to 85%. This uptick is part of a broader trend observed throughout the year, where humidity remains consistently high. Following a dip to around 72% in the spring months of April and May, humidity levels begin to rise again in the sweltering summer, peaking at 82% in July and August. As the year progresses into the fall, humidity stays elevated before culminating in December's high. Overall, this seasonal pattern reflects the island's subtropical climate, characterized by moisture-laden air that keeps the atmosphere thick and often feels quite warm even as temperatures fluctuate.

December Average Humidity in Saint Simons Island

This chart illustrates the average monthly humidity levels in Saint Simons Island, with December's data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, allowing you to see how December's humidity levels compare to other months.
JanFebMarAprMayJunJulAugSepOctNovDec84%79%78%73%72%74%82%82%83%79%82%85%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Saint Simons Island

As the year winds down, December in Saint Simons Island sees a moderation in UV intensity, with the UV Index dipping to 4—a stark contrast to the soaring levels experienced during the summer months, when it peaked at 11. This shift signifies a transition from the extreme exposure of July through September to a more manageable moderate category in December, which allows for longer burn times of approximately 30 minutes. Observing these trends, visitors can confidently plan outdoor activities while still being mindful of sun safety. With milder UV conditions, it's a great time to explore the island’s natural beauty. For further details and insights on UV exposure throughout the year, check out Saint Simons Island UV Index.

Maximum UV Index Levels in Saint Simons Island for December

The chart shows the monthly maximum UV Index (UVI) for Saint Simons Island 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.
JanFebMarAprMayJunJulAugSepOctNovDec579101111111110864
Data source: Saint Simons Island 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.

December Sunshine in Saint Simons Island

As the year winds down in December, Saint Simons Island basks in 231 hours of sunshine, a welcoming glow that brightens the cooler winter months. This marks a slight decline from the previous month, yet it still offers more light compared to the early winter days of January, which starts at 199 hours. Observing the trends throughout the year, one can appreciate how sunshine peaks in the summer, with July receiving a generous 347 hours. The gradual dip in daylight from the vibrant spring months, where April boasts 312 hours, to a softer December is a testament to the island's seasonal rhythm. Despite the decrease, December's sunshine still invites both locals and visitors to savor the island's charm, making it a delightful retreat through the holiday season.

Monthly Sunshine Duration in Saint Simons Island: December Highlighted

The December sunshine duration represents the total number of hours Saint Simons Island experiences direct sunlight during the month of December, excluding cloudy or obstructed periods. This chart compares the sunshine duration of December with the other months of the year.
JanFebMarAprMayJunJulAugSepOctNovDec199h220h297h312h338h317h347h322h302h295h248h231h
Data source: Saint Simons Island December Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Saint Simons Island During December

In Saint Simons Island, December typically presents a 45% chance of sunny weather, which aligns closely with the sunny outlook of earlier winter months like January (44%) and notably contrasts with the significant sunshine of November (55%). As the year progresses, the trend reveals that while late spring and early fall, like April and October, enjoy higher probabilities of sunshine—exceeding 50%—the summer months see a dramatic drop, with June and August plummeting to just 21% and 23%, respectively. This pattern suggests that while December does not guarantee sun, it offers a fairly optimistic chance, maintaining a pleasant coastal charm in the cooler winter season.

Percentage of Sunny Days in December in Saint Simons Island

The chart illustrates the percentage of sunny days in Saint Simons Island throughout the year, with December highlighted. It highlights the variation in sunshine across each month and provides an overview of the typical frequency of sunny days, offering insights into how often Saint Simons Island experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec44%38%39%54%52%21%31%23%47%52%56%45%
Data source: Saint Simons Island December chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Saint Simons Island in December

As the year winds down, Saint Simons Island experiences a familiar rhythm in its daylight duration, culminating in December with 10 hours of sunlight. The pattern reveals a gradual increase in daylight as the days lengthen from the 10 hours of January to a peak of 14 hours in June, highlighting the summer's vibrant glow. However, as autumn sets in, daylight begins to dwindle again, returning to the shorter days of winter. This cyclical dance not only showcases the natural transition of seasons but also invites residents and visitors alike to embrace the cozy charm of the island during the shorter days of December, resonating with the peaceful ambiance that characterizes this time of year.

Average Daylight Hours in Saint Simons Island for December

The chart illustrates the variation in daylight duration in Saint Simons Island throughout the year, with December highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec10h 22m11h 4m12h12h 56m13h 44m14h 7m13h 54m13h 12m12h 18m11h 22m10h 33m10h 8m
Data source: Saint Simons Island daylight hours, calculated by summing the hours between sunrise and sunset for each day.

December Winds in Saint Simons Island

As December settles over Saint Simons Island, the wind whispers a gentle farewell to the year with an average speed of 4.7 m/s (11 mph). This month sees a slight decrease in gusts compared to the bustling conditions of earlier months, echoing the trend of diminishing winds from the summer's peak, where speeds soared above 5.4 m/s (12 mph) in March and November, to the more tranquil breezes of late fall and early winter. Despite the mellow winds, December's atmosphere remains invigorating, inviting residents and visitors alike to enjoy the island's serene coastal charm while wrapped in the comforting embrace of a cooler season. As the year winds down, the subtle shifts in wind serve as a reminder of nature's rhythm, blending seamlessly into the island's enchanting landscape.

Average December Wind Speed in Saint Simons Island

The chart displays monthly wind speed patterns in Saint Simons Island, with values for each month shown alongside December's data, which is highlighted for easy comparison. It illustrates the average wind speed, offering insights into how December's wind conditions compare to the rest of the year.
JanFebMarAprMayJunJulAugSepOctNovDec5.25.35.85.15.75.44.64.64.34.55.44.7 m/s
Data source: Saint Simons Island December wind data, generated using information from the Copernicus Climate Change Service.

How December Weather in Saint Simons Island Compares to Other Months

The weather in Saint Simons Island changes throughout the year, offering a unique experience in each season. Below is a month-by-month comparison of December's weather with other months, highlighting differences in temperature, precipitation, and other key factors. Click on each section to discover seasonal trends in Saint Simons Island and find detailed weather information for every month.

December and January display some notable differences in weather patterns. In December, temperatures range from a minimum of 3°C (37°F) to a maximum of 22°C (72°F), with an average of 15°C (59°F). The month is characterized by significant rainfall, accumulating to 121 mm (4.8 in) over about 10 days, and humidity levels remain high at 85%. In contrast, January experiences slightly cooler temperatures, with a minimum of 0°C (33°F) and a maximum of 23°C (73°F), leading to an average of 13°C (55°F). Precipitation decreases significantly to 61 mm (2.4 in) over approximately 6 days, with humidity at a marginally lower 84%. For more details, you can check out Saint Simons Island weather in January.

In comparing the weather between December and February, both months experience mild temperatures, but February is slightly warmer overall. In December, the minimum temperature sits at 3°C (37°F) with an average of 15°C (59°F) and a maximum of 22°C (72°F), while February has a minimum temperature of 4°C (40°F) and average of 14°C (58°F), peaking at 21°C (71°F). Precipitation is more pronounced in December, totaling 121 mm (4.8 in) over 10 days, compared to February's 93 mm (3.6 in) with precipitation occurring on 11 days. Additionally, December's humidity is higher at 85%, whereas February's humidity is more comfortable at 79%. For a more in-depth look at February weather, you can refer to Saint Simons Island weather in February.

December and March both showcase mild temperatures, but they differ in warmth and precipitation levels. In December, temperatures range from a chilly 3°C (37°F) at night to a pleasant 22°C (72°F) during the day, with an average of 15°C (59°F). The month receives about 121 mm (4.8 in) of rainfall over 10 days, contributing to a higher humidity of 85%. Conversely, March sees slightly warmer temperatures, with nighttime lows of 5°C (41°F) and daytime highs reaching 24°C (76°F), averaging 16°C (62°F). The precipitation in March drops significantly to 60 mm (2.4 in) over just 6 days, accompanied by lower humidity at 78%. For a more detailed look at March weather in Saint Simons Island, check out Saint Simons Island weather in March.

In December, temperatures are generally cooler, with a minimum of 3°C (37°F) and an average of 15°C (59°F), while reaching a maximum of 22°C (72°F). The month is also marked by higher precipitation, totaling 121 mm (4.8 in) over about 10 days, combined with a humidity level of 85%. In contrast, April features milder weather, with a minimum temperature of 9°C (48°F), an average of 20°C (68°F), and a maximum of 28°C (82°F). Precipitation in April is less frequent, totaling 78 mm (3.1 in) over just 7 days and with lower humidity at 72%. For a deeper dive into the April conditions, you can check out Saint Simons Island weather in April.

When comparing the weather in December and May, we observe significant differences in temperature and precipitation. December experiences cooler temperatures, with a minimum of 3°C (37°F) and an average of 15°C (59°F), while May offers much warmer conditions with a minimum of 15°C (59°F) and an average of 23°C (74°F). Additionally, May tends to be drier, with only 65 mm (2.6 in) of precipitation over 8 days compared to December's 121 mm (4.8 in) over 10 days. Humidity levels also differ, as December is more humid at 85%, while May's humidity is lower at 72%. For a detailed look at weather conditions during May, you can explore the link: Saint Simons Island weather in May.

When comparing the weather in December and June, it’s clear that the two months offer dramatically different experiences. December sees milder temperatures, with an average of 15°C (59°F) and a maximum of 22°C (72°F), while June boasts warmer averages of 26°C (79°F) and highs reaching 31°C (89°F). Precipitation is also more frequent in June, occurring on 14 days despite being slightly less intense than December’s 121 mm (4.8 in) over 10 days. Additionally, the humidity in December is notably higher at 85%, compared to June's 74%, contributing to a more comfortable feel during the summer month. For more detailed insights, check out Saint Simons Island weather in June.

In December, the weather is relatively mild, with temperatures ranging from a minimum of 3°C (37°F) to a maximum of 22°C (72°F) and an average of 15°C (59°F). Accompanied by high humidity at 85%, this month also sees about 121 mm (4.8 in) of precipitation over approximately 10 days. In stark contrast, July brings much warmer conditions, with temperatures ranging from a minimum of 24°C (76°F) to a maximum of 32°C (89°F) and an average of 27°C (82°F). Although July experiences slightly higher precipitation at 136 mm (5.3 in) over 16 days, humidity levels are somewhat lower at 82%. For more details on the hot summer days, check out the Saint Simons Island weather in July.

December and August offer contrasting weather experiences. In December, temperatures range from a cool minimum of 3°C (37°F) to a pleasant average of 15°C (59°F), peaking at 22°C (72°F). The month sees around 121 mm (4.8 in) of precipitation over 10 days, contributing to a high humidity level of 85%. In stark comparison, August features much warmer temperatures, with a minimum of 24°C (76°F), an average of 27°C (82°F), and maximums reaching 31°C (89°F). The humidity is slightly lower at 82%, although it experiences more rainfall, totaling 136 mm (5.4 in) across 19 days. For a detailed look at the climate, check Saint Simons Island weather in August.

In comparing the weather between December and September, a distinct contrast emerges. December features cooler temperatures, with a minimum of 3°C (37°F) and an average of 15°C (59°F), while September enjoys a much warmer climate, with a minimum of 19°C (66°F) and an average of 27°C (80°F). Precipitation is slightly lower in December at 121 mm (4.8 in) over 10 days, compared to September's 166 mm (6.5 in) over 15 days. Humidity levels are relatively similar, with December at 85% and September slightly lower at 83%. For a more detailed look at September weather, visit Saint Simons Island weather in September.

December weather is notably cooler than October, with temperatures ranging from a minimum of 3°C (37°F) to a maximum of 22°C (72°F), compared to October's more pleasant range of 11°C (51°F) to 30°C (86°F). The average temperature in December is significantly lower at 15°C (59°F), while October enjoys a warmer average of 24°C (75°F). Additionally, December experiences more precipitation, with 121 mm (4.8 in) over approximately 10 days, in contrast to October's 82 mm (3.2 in) spread over 11 days. Despite the extra rainfall in December, the humidity remains relatively high at 85%, just slightly above October's 79%. For those interested in a more detailed look at October weather, you can find additional information here: Saint Simons Island weather in October.

In comparing the weather of December and November, notable differences in temperature and precipitation emerge. December features a lower minimum temperature of 3°C (37°F) and an average of 15°C (59°F), making it cooler than November, which has a minimum of 5°C (41°F) and an average of 18°C (65°F). The maximum temperatures also decline from November's 27°C (80°F) to December's 22°C (72°F). Precipitation sees a slight increase in December, totaling 121 mm (4.8 in) over 10 days compared to November's 99 mm (3.9 in) over 7 days. Humidity levels are similar, with December at 85% and November slightly lower at 82%. For more details, check out Saint Simons Island weather in November.

Compare Saint Simons Island's Climate with Cities Worldwide

Conclusion: What to Expect From December Weather in Saint Simons Island

As December settles in on Saint Simons Island, the weather takes on a milder charm compared to the sweltering summer months. With average temperatures hovering around a comfortable 15°C (59°F), it invites visitors to enjoy the outdoors without the oppressive heat. While the island experiences occasional rainfall, with about 121 mm (4.8 in) falling over approximately 10 days, the higher humidity of 85% adds a touch of tropical allure. This month acts as a gentle transition into winter, contrasting sharply with the warmth of late spring and summer, making it an ideal time for those seeking a serene escape. For a deeper dive into the island's weather patterns throughout the year, check out Saint Simons Island Climate.