January Weather in Sullivans Island, United States

Last updated: February 24, 2025

In January, Sullivans Island experiences a varied climate, characterized by maximum temperatures reaching 21°C (70°F) and an average of 12°C (53°F). Cool evenings may dip as low as -5°C (24°F), reminding visitors of winter's embrace. With 66 mm (2.6 in) of precipitation over approximately 8 days, the month often brings occasional rain, contributing to an overall humidity level of 83%. This combination creates a unique environment that captures the charm of this coastal destination, making it an intriguing time to explore the island's beauty.

January Temperature in Sullivans Island

In January, Sullivans Island experiences a cool transition into the year, with temperatures ranging from a brisk -5°C (24°F) at their lowest to a comfortable 21°C (70°F) at the peak. The average temperature settles around 12°C (53°F), showcasing the island's mild climate. As the month progresses into February, the warmth begins to rise slightly, with temperatures starting from 2°C (36°F) and climbing to a similar maximum of 21°C (70°F). This pattern of gradual warming continues into March, where temperatures begin to steadily increase, peaking at 23°C (74°F). Overall, January serves as a notable pivot point, setting the stage for the warmer months ahead.

January Weather in Sullivans Island: Daily Temperature Highs, Lows, and Averages

The chart illustrates January temperature patterns in Sullivans Island, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec535659667378818179736156
Data source: Temperature data for Sullivans 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.

January Precipitation in Sullivans Island

January on Sullivans Island brings a moderate precipitation average of 66 mm (2.6 in), typically spread over 8 days. This sets the stage for a winter landscape that transitions into the wetter months ahead. As the year unfolds, rainfall steadily increases, peaking in August with 197 mm (7.8 in), while the number of rainy days also escalates, reaching up to 21 days during the summer. Interestingly, although January is relatively dry compared to mid-year, it lays the groundwork for a shift in patterns as the island gears up for a humid season. This trend reflects the distinct seasonal variability that characterizes Sullivans Island, shaping its unique coastal environment.

January Precipitation Trends in Sullivans Island

The chart displays monthly precipitation patterns in Sullivans Island, with values for each month alongside January's data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how January's conditions compare to those of other months.
JanFebMarAprMayJunJulAugSepOctNovDec6691621058214417119718885103142
Data source: Precipitation data for January generated using information from the Copernicus Climate Change Service.
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January Humidity in Sullivans Island

In January, Sullivans Island experiences a notable humidity level of 83%, setting a pattern for the winter months characterized by elevated moisture in the air. As the year progresses into February and March, humidity slightly declines to 79%, but it doesn’t stray far from this range. The onset of April heralds a gradual decrease, stabilizing around 78% through to June. However, as summer approaches, July and August see a spike in humidity once more, reaching 82% and 81% respectively. The trend continues into the fall months, with moisture levels hovering between 81% and 84% from September to December. This cyclical pattern showcases Sullivans Island's humid subtropical climate, where high humidity remains a constant presence throughout the year, significantly affecting its coastal environment.

January Average Humidity in Sullivans Island

This chart illustrates the average monthly humidity levels in Sullivans Island, with January's data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, allowing you to see how January's humidity levels compare to other months.
JanFebMarAprMayJunJulAugSepOctNovDec84%80%79%78%78%78%82%81%81%78%82%84%
Data source: Humidity data for January generated using information from the Copernicus Climate Change Service.

January UV Index in Sullivans Island

In January, Sullivans Island experiences a moderate UV Index of 4, allowing for a burn time of about 30 minutes. As the months progress, the UV Index steadily increases, peaking in July with an extreme level of 12, where just 10 minutes of exposure can lead to sunburn. Notably, February through April sees a significant rise, moving from a high of 7 to 10, indicating a shift toward more intense sun exposure as spring approaches. By May, the index reaches 11, maintaining this extreme status through the summer months, before tapering off in the fall and winter. This clear upward trend in UV intensity emphasizes the importance of sun safety as the year advances. For more detailed UV information, visit Sullivans Island UV Index.

Maximum UV Index Levels in Sullivans Island for January

The chart shows the monthly maximum UV Index (UVI) for Sullivans Island in January, 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.
JanFebMarAprMayJunJulAugSepOctNovDec47910111112119864
Data source: Sullivans Island January 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.

January Sunshine in Sullivans Island

In Sullivans Island, the month of January offers around 190 hours of sunshine, a gentle start to the year as winter's grasp begins to ease. As February rolls in, sunlight increases to 218 hours, hinting at the warmth to come. By March, beachgoers can bask in 282 hours, and the trend continues upward with April boasting 313 hours. The summer months shine brightest, peaking in July with 345 hours of radiant sunshine. However, as the year progresses, the sun begins to set earlier, leading to a gradual decline in hours—from 321 in August to 220 in December. This rhythmic ebb and flow of sunlight not only signifies the changing seasons but also invites residents and visitors alike to embrace the natural beauty of Sullivans Island throughout the year.

Monthly Sunshine Duration in Sullivans Island: January Highlighted

The January sunshine duration represents the total number of hours Sullivans Island experiences direct sunlight during the month of January, excluding cloudy or obstructed periods. This chart compares the sunshine duration of January with the other months of the year.
JanFebMarAprMayJunJulAugSepOctNovDec190h218h282h313h342h326h345h321h304h294h248h220h
Data source: Sullivans Island January Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Sullivans Island During January

In Sullivans Island, January offers a 45% chance of sunny weather, making it one of the more promising months for sun-seekers amidst the often-gray winter skies. This likelihood, while favorable, shows a slight dip when compared to the sunniest months of April and November, which boast chances of 57% and 61%, respectively. The transition into spring reveals a clear upward trend in sunny days, peaking in mid to late spring, only to decline again as summer approaches, with July and August featuring their lowest probabilities at 36% and 32%. Thus, if you're planning a visit in January, there’s a decent chance for sunshine, but the best sun-kissed days are just around the corner as the year progresses.

Percentage of Sunny Days in January in Sullivans Island

The chart illustrates the percentage of sunny days in Sullivans Island throughout the year, with January 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 Sullivans Island experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec45%39%38%57%53%30%36%32%52%50%61%47%
Data source: Sullivans Island January chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Sullivans Island in January

In Sullivans Island, January brings about 10 hours of daylight, marking the beginning of a gradual increase as winter gives way to spring. As the month progresses into February, daylight extends to 11 hours. This upward trend continues, peaking in June and July with a luxurious 14 hours of sunlight, allowing for ample time to enjoy the island’s serene beaches and vibrant sunsets. Following this summer peak, daylight gently recedes, tapering back to 11 hours in October and returning to 10 hours in both November and December. This cyclical rhythm not only defines the island's seasons but also shapes the experiences of its residents and visitors alike, transforming each month into a unique chapter of natural beauty.

Average Daylight Hours in Sullivans Island for January

The chart illustrates the variation in daylight duration in Sullivans Island throughout the year, with January highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec10h 15m11h 1m12h13h13h 50m14h 15m14h 2m13h 17m12h 19m11h 19m10h 27m10h 1m
Data source: Sullivans Island daylight hours, calculated by summing the hours between sunrise and sunset for each day.

January Winds in Sullivans Island

In January, Sullivans Island experiences a pleasant average wind speed of 5.2 m/s (12 mph), setting a tone of mild breeziness that lingers into the following months. As winter transitions to spring, wind speeds remain consistent, with 5.1 m/s (11 mph) in February and an uptick back to 5.2 m/s (12 mph) in March, highlighting a stable maritime climate. However, a gradual decrease begins in April, where winds drop to 4.9 m/s (11 mph), reaching a seasonal low of 3.9 m/s (9 mph) by August. This trend of softer winds continues into September and October, before rebounding slightly in November to 5.0 m/s (11 mph). Overall, the data reveals a pattern of consistency interrupted by a gentle slowdown during the summer months, creating a serene atmosphere ideal for beachgoers and nature lovers alike.

Average January Wind Speed in Sullivans Island

The chart displays monthly wind speed patterns in Sullivans Island, with values for each month shown alongside January's data, which is highlighted for easy comparison. It illustrates the average wind speed, offering insights into how January's wind conditions compare to the rest of the year.
JanFebMarAprMayJunJulAugSepOctNovDec5.2 m/s5.15.24.95.24.94.43.94.04.35.04.7
Data source: Sullivans Island January wind data, generated using information from the Copernicus Climate Change Service.

How January Weather in Sullivans Island Compares to Other Months

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

In January, temperatures range from a chilly minimum of -5°C (24°F) to a pleasant maximum of 21°C (70°F), with an average of 12°C (53°F). The month experiences about 66 mm (2.6 in) of precipitation over 8 days, contributing to a relatively high humidity level of 83%. In contrast, February sees a slight adjustment in temperatures, starting at a minimum of 2°C (36°F) and maintaining the same maximum of 21°C (70°F), while the average temperature rises to 14°C (57°F). Precipitation increases to 91 mm (3.6 in), occurring over 11 days and resulting in a lower humidity of 79%. For more detailed weather insights, check out Sullivans Island weather in February.

In comparison, January tends to be cooler, with temperatures ranging from a minimum of -5°C (24°F) to an average of 12°C (53°F), reaching a maximum of 21°C (70°F). The month also sees higher humidity at 83% and experiences an average of 8 rainy days, with a total precipitation of 66 mm (2.6 in). Conversely, March heralds the arrival of milder weather, with minimum temperatures of 2°C (36°F), an average of 15°C (60°F), and a maximum temperature of 23°C (74°F). Precipitation is slightly lower at 62 mm (2.4 in), spread across about 7 days, and humidity drops to a more comfortable 79%. For more detailed information, check out Sullivans Island weather in March.

In January, temperatures in Sullivans Island typically range from a chilly minimum of -5°C (24°F) to a pleasant maximum of 21°C (70°F), with an average of 12°C (53°F). The month sees about 66 mm (2.6 in) of precipitation over 8 days, coupled with a high humidity level of 83%, creating a damp and cool atmosphere. In contrast, April offers a warmer climate, with minimums around 6°C (42°F) and maximums reaching 27°C (81°F), averaging at a comfortable 19°C (66°F). Precipitation increases to 105 mm (4.1 in) over the same 8 days, yet humidity dips slightly to 78%, making for a more pleasant but still humid spring. For more details, you can check out Sullivans Island weather in April.

In January, the weather is quite chilly, with temperatures ranging from a minimum of -5°C (24°F) to a pleasant average of 12°C (53°F), peaking at a maximum of 21°C (70°F). With a moderate humidity level of 83% and precipitation of 66 mm (2.6 in) over 8 days, the month feels crisp and cool. In contrast, May brings much warmer conditions, with temperatures starting at a minimum of 12°C (55°F) and averaging 23°C (74°F), reaching highs of 31°C (89°F). While May experiences slightly more precipitation at 82 mm (3.2 in) over the same number of days, the humidity is lower at 78%, creating a more comfortable atmosphere. For more details, check out Sullivans Island weather in May.

January and June present a stark contrast in weather conditions. In January, temperatures range from a chilly -5°C (24°F) to a pleasant 21°C (70°F), with an average of 12°C (53°F). The month sees about 66 mm (2.6 in) of precipitation over 8 days, and high humidity at 83% adds to the cool atmosphere. In comparison, June offers a much warmer climate, with temperatures varying from a minimum of 18°C (64°F) to a maximum of 32°C (90°F), averaging 26°C (79°F). It experiences significantly higher precipitation at 144 mm (5.7 in) spread over 17 days, though humidity decreases to 78%. For more detailed information on June weather, you can visit Sullivans Island weather in June.

In January, the weather is cool with temperatures ranging from a minimum of -5°C (24°F) to a maximum of 21°C (70°F), averaging around 12°C (53°F). The month sees about 66 mm (2.6 in) of precipitation spread over 8 days, with a high humidity level of 83%.

In contrast, July experiences much warmer temperatures, with a minimum of 22°C (72°F) and a maximum of 32°C (89°F), averaging 27°C (81°F). This month is also significantly wetter, receiving 171 mm (6.7 in) of precipitation over 16 days, with humidity slightly lower at 82%. For more details, you can visit Sullivans Island weather in July.

January and August present strikingly different weather conditions. In January, temperatures range from a brisk minimum of -5°C (24°F) to a pleasant maximum of 21°C (70°F), with an average temperature of about 12°C (53°F). This month experiences an average of 66 mm (2.6 in) of precipitation over approximately 8 days, coupled with a high humidity level of 83%. In contrast, August is characterized by much warmer temperatures, with a minimum of 23°C (73°F) and a maximum reaching 31°C (89°F), leading to a much higher average of 27°C (81°F). Rainfall is more frequent during August as well, accumulating to 197 mm (7.8 in) over 21 days, while humidity remains relatively high at 81%. For those interested in more specific details about the weather in August, you can visit Sullivans Island weather in August.

In January, the weather is quite cool, with temperatures ranging from a minimum of -5°C (24°F) to a maximum of 21°C (70°F) and an average of 12°C (53°F). The month experiences 66 mm (2.6 in) of precipitation over about 8 days, and the humidity level hovers around 83%. In contrast, September brings much warmer conditions, with temperatures ranging from a minimum of 16°C (61°F) to a maximum of 32°C (90°F), averaging 26°C (79°F). The month sees more rainfall, totaling 188 mm (7.4 in) across approximately 14 days, while the humidity remains relatively consistent at 81%. For more details on September weather, check out Sullivans Island weather in September.

In January, temperatures in Sullivans Island range from a chilly minimum of -5°C (24°F) to a pleasant maximum of 21°C (70°F), with an average temperature of 12°C (53°F). This month sees about 66 mm (2.6 in) of precipitation over 8 days, accompanied by high humidity at 83%. Conversely, October brings warmer temperatures, with a minimum of 7°C (46°F) and a maximum of 29°C (85°F), resulting in an average temperature of 23°C (73°F). The rainfall increases slightly to 85 mm (3.4 in) over 10 days, but with a lower humidity of 78%. For more details, you can check Sullivans Island weather in October.

January and November exhibit distinct weather patterns. In January, temperatures range from a chilly minimum of -5°C (24°F) to a mild maximum of 21°C (70°F), with an average of 12°C (53°F). The month sees around 66 mm (2.6 in) of precipitation spread over 8 days, accompanied by high humidity levels of 83%. In contrast, November offers a warmer climate, with a minimum of 3°C (38°F) and a maximum of 26°C (79°F), averaging 16°C (62°F). Precipitation increases to 103 mm (4.1 in) over the same 8 days, with humidity slightly lower at 82%. For a detailed look into the weather conditions during this month, you can check out Sullivans Island weather in November.

In comparing the weather between January and December, we see notable differences in temperature and precipitation. January experiences a wider temperature range, with minimums dropping to -5°C (24°F) and maximums reaching 21°C (70°F), while December maintains a milder minimum of 0°C (33°F) and a slightly higher maximum of 22°C (72°F). Additionally, January has 66 mm (2.6 in) of precipitation over 8 days, whereas December sees significantly more rainfall at 141 mm (5.6 in) over 10 days. Humidity levels remain comparable, with January recording 83% and December slightly higher at 84%. For more details on December weather patterns, visit Sullivans Island weather in December.

Compare Sullivans Island's Climate with Cities Worldwide

Conclusion: What to Expect From January Weather in Sullivans Island

January weather on Sullivans Island stands out as a month of cooler temperatures and increased humidity compared to the milder seasons that precede it. While the coastal charm remains, January often brings a chill in the air, with temperatures dipping lower than the preceding months. Precipitation, though moderate, arrives on about a quarter of the days, lending a crispness to the atmosphere. The blend of 83% humidity enhances the coastal experience, making the fresh sea breezes feel invigorating. For those interested in more detailed climate patterns throughout the year, visit Sullivans Island Climate.