January Weather in Key Biscayne, United States

Last updated: February 24, 2025

January in Key Biscayne offers a delightful blend of mild temperatures and refreshing coastal breezes. With maximum temperatures reaching 28°C (83°F) and an average of 21°C (70°F), visitors can enjoy comfortable days perfect for outdoor activities. While chilly spells can drop temperatures as low as 7°C (44°F), the allure of the island remains strong. Rainfall is modest, with 34 mm (1.3 in) expected over about 6 days, and an average humidity of 81% adds to the tropical ambiance. Whether soaking up the sun or exploring the vibrant local scene, January provides an inviting escape in this beautiful slice of Florida.

January Temperature in Key Biscayne

In Key Biscayne, January brings a delightful blend of cool and warm temperatures, making it an appealing escape from colder northern climates. The month kicks off with minimum temperatures around 7°C (44°F) but quickly rises to a pleasant average of 21°C (70°F), peaking at a comfortable 28°C (83°F). As the year progresses into February, the temperature steadily increases, with lows hovering at 10°C (51°F) and maintaining a similar maximum, still offering plenty of warm sunshine. This gradual warming trend continues into March and April, where the minimum temperatures rise significantly, ultimately reaching 15°C (59°F) in April, complemented by average highs climbing to 32°C (90°F). Overall, January presents a transitional phase, introducing the mild and inviting conditions that make Key Biscayne a perfect winter getaway, while hinting at the burgeoning warmth that will characterize the approaching spring months.

January Weather in Key Biscayne: Daily Temperature Highs, Lows, and Averages

The chart illustrates January temperature patterns in Key Biscayne, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec707373777982838382807672
Data source: Temperature data for Key Biscayne 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 Key Biscayne

In Key Biscayne, January marks the beginning of the year with relatively mild precipitation, totaling 34 mm (1.3 in) over a modest 6 days of rain. This sets the tone for a gradual increase in rainfall as the months progress. Notably, February and March follow with slightly higher totals, but it’s in April that precipitation begins to rise significantly, cementing the onset of the wetter season. By May, the rainfall soars to 161 mm (6.3 in), coinciding with an uptick in rainy days, which culminates in the peak months of the summer, where July and August frequently see over 170 mm of rain. Overall, January serves as a gentle introduction to a lush, tropical climate, paving the way for the lush greenery nourished by increasingly abundant rainfall in the subsequent months.

January Precipitation Trends in Key Biscayne

The chart displays monthly precipitation patterns in Key Biscayne, 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.
JanFebMarAprMayJunJulAugSepOctNovDec345031631611721741812031579341
Data source: Precipitation data for January generated using information from the Copernicus Climate Change Service.
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January Humidity in Key Biscayne

In January, Key Biscayne experiences a relatively high humidity level at 81%, setting the tone for a month characterized by a lush, tropical feel. As the year progresses into February, humidity slightly decreases to 79%, continuing the trend of moist conditions, but gradually easing into spring by March at 76%. This decline continues until April when humidity reaches 73%, indicating a subtle shift toward drier air. However, the humidity begins to stabilize as summer approaches, hovering around the 70% mark from June to August. Interestingly, September and October see a resurgence to 76% and 79%, respectively, as the transition back to the wetter conditions of fall sets in, maintaining the tropical atmosphere. Finally, both November and December mirror January's humidity levels at 80% and 81%, wrapping up the year with a familiar warmth that invites residents and visitors alike to embrace its lush surroundings.

January Average Humidity in Key Biscayne

This chart illustrates the average monthly humidity levels in Key Biscayne, 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.
JanFebMarAprMayJunJulAugSepOctNovDec81%80%76%73%71%70%70%72%76%79%80%81%
Data source: Humidity data for January generated using information from the Copernicus Climate Change Service.

January UV Index in Key Biscayne

In January, Key Biscayne experiences a UV Index of 6, indicating a high level of sun exposure with a burn time of approximately 25 minutes. This moderate caution level marks a gentle transition into the year, but as the months progress, the UV Index steadily climbs, reaching very high levels of 9 in February and hitting 10 by March. The peak sun intensity continues into the spring and summer, where the Index escalates to extreme levels of 12 and 13 from April through June, significantly reducing safe exposure times to just 10 minutes. As fall approaches, the UV Index slightly decreases, yet remains high enough to warrant attention, with values dropping to 8 in November and returning to 6 by December. For comprehensive insights on UV exposure throughout the year, visit Key Biscayne UV Index.

Maximum UV Index Levels in Key Biscayne for January

The chart shows the monthly maximum UV Index (UVI) for Key Biscayne 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.
JanFebMarAprMayJunJulAugSepOctNovDec69101212131212111086
Data source: Key Biscayne 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 Key Biscayne

In Key Biscayne, January kicks off the year with a delightful 226 hours of sunshine, setting a cheerful tone for the months ahead. As the season progresses, the days become longer and brighter, peaking in April with 336 hours, a fantastic invitation for outdoor activities. The sunshine remains bountiful through the summer, consistently delivering over 300 hours per month, with July shining the brightest at 344 hours. As autumn rolls in, the hours gradually decrease, yet still offer a healthy dose of sunlight, notably in September with 314 hours. This gradual decline continues into the winter months, but even December's 290 hours ensures the charm of sunny days lingers well into the year's end. Overall, Key Biscayne’s sunshine pattern is a captivating showcase of warmth and light, perfect for both relaxation and adventure.

Monthly Sunshine Duration in Key Biscayne: January Highlighted

The January sunshine duration represents the total number of hours Key Biscayne 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.
JanFebMarAprMayJunJulAugSepOctNovDec226h281h327h336h325h312h344h340h314h305h280h290h
Data source: Key Biscayne January Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Key Biscayne During January

In Key Biscayne, January presents a 42% chance of sunny weather, making it one of the brighter months of the winter. Although the likelihood of sun dips slightly compared to December’s robust 64%, it sets the stage for the more promising February, which boasts a 60% chance of sunshine. This upward trend continues into March and April, where sunny days become even more frequent. In contrast, the summer months, particularly June through August, see a sharp decline in sunny weather, with chances dropping to as low as 15%. Ultimately, while January may not be the sunniest month, it lays the groundwork for a delightful turn towards spring with increasingly favorable weather ahead.

Percentage of Sunny Days in January in Key Biscayne

The chart illustrates the percentage of sunny days in Key Biscayne 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 Key Biscayne experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec42%60%55%55%48%15%19%24%31%44%40%64%
Data source: Key Biscayne January chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Key Biscayne in January

In January, Key Biscayne enjoys around 10 hours of daylight, marking the start of longer days as the year progresses. By February, daylight extends to 11 hours, a subtle increase that hints at the forthcoming spring. March ushers in the most significant leap, with 12 hours of daylight, which continues through April, only to stabilize until August. During the peak months of May through July, residents bask in 13 hours of sunlight, perfect for outdoor activities and seaside relaxation. As summer wanes, daylight gradually recedes, dropping back to 12 hours in August and September, before settling at 11 hours in October. As the year closes, November and December bring back the shorter 10-hour days, creating a rhythmic cycle of light that characterizes this vibrant coastal locale.

Average Daylight Hours in Key Biscayne for January

The chart illustrates the variation in daylight duration in Key Biscayne throughout the year, with January highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec10h 43m11h 17m12h 1m12h 46m13h 23m13h 42m13h 32m12h 58m12h 15m11h 30m10h 52m10h 33m
Data source: Key Biscayne daylight hours, calculated by summing the hours between sunrise and sunset for each day.

January Winds in Key Biscayne

In January, Key Biscayne experiences an average wind speed of 3.9 m/s (9 mph), marking a gentle start to the year. This light breeze typically sweeps through the island, providing a refreshing atmosphere that invites outdoor activities. As winter fades into spring, wind speeds gradually increase; February and March both see a rise to 4.9 m/s (11 mph), creating an invigorating environment perfect for water sports and beach strolls. However, by July, the winds begin to calm down significantly, dropping to a low of 3.1 m/s (7 mph), hinting at a more still and sultry summer. The trend continues through the fall, with September hitting its lowest point at 2.4 m/s (5 mph), before a slight recovery as the year wraps up. Overall, January’s mild winds herald a dynamic seasonal pattern that both residents and visitors enjoy throughout the year.

Average January Wind Speed in Key Biscayne

The chart displays monthly wind speed patterns in Key Biscayne, 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.
JanFebMarAprMayJunJulAugSepOctNovDec3.9 m/s4.94.94.44.63.93.13.42.43.54.13.4
Data source: Key Biscayne January wind data, generated using information from the Copernicus Climate Change Service.

How January Weather in Key Biscayne Compares to Other Months

The weather in Key Biscayne 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 Key Biscayne and find detailed weather information for every month.

When comparing the weather in January and February, January typically enjoys slightly cooler temperatures, with an average of 21°C (70°F) and minimums dipping to 7°C (44°F). In contrast, February sees a rise in temperatures, boasting an average of 23°C (73°F) and minimums of 10°C (51°F). Both months share a maximum temperature cap of 28°C (83°F). However, February experiences a bit more precipitation, with 50 mm (2.0 in) over 9 days compared to January’s 34 mm (1.3 in) across 6 days. Despite this, humidity levels remain fairly comparable, with January at 81% and February slightly lower at 79%. For more details on the monthly weather conditions, visit Key Biscayne weather in February.

In comparison to January, March presents a slightly warmer climate with average temperatures rising from 21°C (70°F) in January to 23°C (73°F) in March. The minimum temperature also increases by 5 degrees, from 7°C (44°F) in January to 12°C (54°F) in March, while the maximum temperature sees a marginal rise from 28°C (83°F) to 30°C (86°F). Precipitation remains relatively similar, with January receiving 34 mm (1.3 in) over 6 days and March seeing 30 mm (1.2 in) over 5 days. Additionally, humidity levels decrease slightly from 81% in January to 76% in March. For more detailed information, you can explore Key Biscayne weather in March.

January and April in Key Biscayne showcase a noticeable shift in weather patterns. In January, the temperatures range from a mild minimum of 7°C (44°F) to a maximum of 28°C (83°F), with an average temperature of 21°C (70°F). The month sees about 34 mm (1.3 in) of precipitation over approximately six days, contributing to a higher humidity level of 81%. In contrast, April experiences warmer temperatures, ranging from a minimum of 15°C (59°F) to a maximum of 32°C (90°F), with an average of 25°C (77°F). Precipitation increases to 63 mm (2.5 in) over around eleven days, and the humidity drops slightly to 73%. For more detailed insights, check out Key Biscayne weather in April.

In comparing the weather between January and May, a clear contrast emerges. January typically experiences milder temperatures, with a minimum of 7°C (44°F) and an average of 21°C (70°F), peaking at a maximum of 28°C (83°F). The humidity is notably high at 81%, and precipitation averages around 34 mm (1.3 in) over approximately 6 days. In stark contrast, May welcomes warmer temperatures, starting at a minimum of 19°C (66°F) and averaging 26°C (79°F), reaching up to 31°C (88°F). However, it also comes with increased rainfall, totaling 161 mm (6.3 in) across 18 days, while humidity falls slightly to 71%. For a more detailed look at what to expect, check out Key Biscayne weather in May.

In January, the weather is mild with temperatures ranging from a minimum of 7°C (44°F) to a maximum of 28°C (83°F), accompanied by relatively low precipitation of 34 mm (1.3 in) over just 6 days, and an average humidity of 81%. In contrast, June brings significantly warmer temperatures, with a minimum of 24°C (75°F) and a maximum of 32°C (90°F), along with much higher precipitation totaling 172 mm (6.8 in) over 22 days, while humidity decreases to 69%. The stark difference in weather conditions between these two months highlights the transition from a cool, dry winter to a warm, wet summer. For more detailed information on June weather specifically, you can check Key Biscayne weather in June.

In January, the weather is mild with temperatures ranging from a minimum of 7°C (44°F) to a maximum of 28°C (83°F), averaging around 21°C (70°F). This month experiences relatively low precipitation at 34 mm (1.3 in) over about 6 days, along with a higher humidity of 81%. In contrast, July's weather is significantly warmer and more humid, with temperatures starting at a minimum of 24°C (76°F) and peaking at 33°C (92°F), maintaining an average of 28°C (83°F). July also sees much higher precipitation, totaling 173 mm (6.8 in) over approximately 26 days, though with a slightly lower humidity level of 70%. For more detailed insights, visit Key Biscayne weather in July.

In January, the weather is significantly cooler, with temperatures ranging from a min of 7°C (44°F) to a max of 28°C (83°F), and an average of 21°C (70°F). This month experiences relatively low rainfall, with only 34 mm (1.3 in) over about 6 days, and high humidity at 81%. In contrast, August brings warmer conditions, with temperatures ranging from a min of 25°C (76°F) to a max of 32°C (90°F), averaging 28°C (83°F). However, it's also a wetter month, with 181 mm (7.1 in) of precipitation spread across 25 days and lower humidity at 72%. For more details and insights on the August weather, you can check Key Biscayne weather in August.

In comparing January and September weather, we can see significant differences. January experiences milder temperatures, with a minimum of 7°C (44°F) and an average high of 28°C (83°F), whereas September boasts much warmer conditions, with minimums of 24°C (75°F) and a maximum of 33°C (91°F). While January has relatively low precipitation at 34 mm (1.3 in) over about 6 days, September sees a substantial increase with 203 mm (8.0 in) over 22 days. Additionally, January features higher humidity levels at 81%, compared to September’s 76%. For a more detailed look at the weather patterns, you can visit Key Biscayne weather in September.

In January, Key Biscayne experiences milder temperatures, with a minimum of 7°C (44°F) and an average of 21°C (70°F), while October boasts warmer conditions, featuring a minimum of 15°C (59°F) and an average of 27°C (81°F). Additionally, January sees significantly less precipitation, with only 34 mm (1.3 in) over 6 days, compared to October's 157 mm (6.2 in) spread over 22 days. Despite the increased rainfall in October, the humidity remains relatively similar, hovering around 79% to 81%. For a closer look at October's weather specifics, visit Key Biscayne weather in October.

In comparing January and November weather, January tends to be slightly cooler, with temperatures ranging from a minimum of 7°C (44°F) to a maximum of 28°C (83°F), while November enjoys milder conditions with a minimum of 12°C (54°F) and a maximum of 30°C (86°F). Additionally, November experiences significantly higher precipitation, averaging 93 mm (3.7 in) over 14 days compared to January's 34 mm (1.3 in) over just 6 days, making November a wetter month. Humidity levels are quite similar, hovering around 80-81%. For more detailed insights, check out Key Biscayne weather in November.

January and December in Key Biscayne offer mild and pleasant weather, but there are notable differences between the two months. In January, the temperatures range from a minimum of 7°C (44°F) to a maximum of 28°C (83°F), providing an average of 21°C (70°F). The month experiences less precipitation at 34 mm (1.3 in) over 6 days, while maintaining a consistent humidity level of 81%. In contrast, December features slightly warmer temperatures, with a minimum of 11°C (51°F) and an average of 22°C (72°F), peaking at 29°C (84°F). However, it also sees more rainfall, with a total of 41 mm (1.6 in) spread across 9 days. For more detailed weather insights, check out Key Biscayne weather in December.

Compare Key Biscayne's Climate with Cities Worldwide

Conclusion: What to Expect From January Weather in Key Biscayne

January in Key Biscayne offers a delightful escape from winter chill, featuring mild temperatures that contrast sharply with the summer months. While the average temperature hovers comfortably around 21°C (70°F), the occasional dip is a refreshing change, allowing for a cozy atmosphere. Despite experiencing about 6 days of rain, the total precipitation remains low, making it less humid than other times of the year. This combination creates a pleasant climate, ideal for outdoor activities and enjoying the scenic beauty of the area. For further insights into the weather patterns throughout the year, explore Key Biscayne Climate.