Last updated: August 31, 2025
In January, Guaynabo, Puerto Rico experiences a tropical climate characterized by warm temperatures and notable humidity. With maximums reaching 29°C (84°F) and an average of 24°C (76°F), residents and visitors alike enjoy a comfortably warm atmosphere. However, the month also brings cooler lows of around 19°C (66°F), perfect for evening strolls. Rainfall is a common occurrence, with 48 mm (1.9 in) of precipitation spread over 16 days, contributing to the lush greenery of the region. Humidity levels hover around 76%, enhancing the tropical feel of this vibrant locale.
In Guaynabo, Puerto Rico, January offers a delightful tropical retreat with temperatures that range from a comfortable 19°C (66°F) at night to 29°C (84°F) during the day, averaging around 24°C (76°F). This month provides a subtle transition into the warmer months, marked by minimal fluctuations. As February approaches, nighttime lows rise slightly to 20°C (69°F), but the average remains stable, emphasizing the region's warm climate. Interestingly, the warmth continues to build throughout the following months, culminating in higher daytime temperatures that persist well into spring. By April, for instance, highs can reach 30°C (86°F), signaling the arrival of summer. Overall, the January weather sets the stage for a pleasant experience, enticing visitors to bask in the warmth while enjoying the vibrant scenery of the island.
In January, Guaynabo, Puerto Rico, experiences a modest precipitation of 48 mm (1.9 in) over the course of 16 rainy days. This marks the beginning of a gradual increase in rainfall as the year progresses, with precipitation steadily rising through the months, peaking in September with a striking 200 mm (7.9 in) across 27 days. The pattern highlights a clear seasonal trend, where the initial light showers of January and February escalate into the intense downpours typical of the summer months. By the time we reach August, the rainfall not only intensifies but also stretches the number of rainy days, making it crucial for residents to gear up for a wetter climate as the year unfolds. This transition underscores Guaynabo's tropical climate, characterized by its significant seasonal variability in precipitation.
In January, Guaynabo, Puerto Rico, experiences humidity levels averaging 76%, setting the tone for the rest of the year. As winter gives way to spring, humidity dips slightly to 75% in February and March, before stabilizing around this mark through to May. Interestingly, the arrival of summer in June brings a gentle rise, peaking at 80% in both July and August. Following the peak, humidity begins to ease into the latter months of the year, gradually decreasing to 78% in October and November, and returning to 76% by December. This cycle reflects the region's tropical climate, showcasing a moderate yet consistent humidity trend that shapes the character of each season.
In January, Guaynabo, Puerto Rico experiences a UV Index of 9, categorizing exposure as very high, with a burn time of just 15 minutes. This sets the stage for an intense UV season, as the following months see a dramatic increase in UV levels. From February to May, the index escalates to a staggering 14, marking an extreme exposure category and a minimal burn time of only 10 minutes. Even in the following summer months, the UV Index remains consistently high, fluctuating between 12 and 13, indicative of sustained intense sun exposure. By November and December, UV levels dip back to 9 and 8, respectively, but still maintain a very high threat. This trend underscores the importance of year-round sun protection in Guaynabo. For more information, visit Guaynabo UV Index.
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January in Guaynabo, Puerto Rico, typically sees 257 hours of sunshine, setting the stage for a gradual transition into a sun-soaked spring. As the months progress, the sunshine hours steadily climb, peaking in May with an impressive 356 hours before slightly tapering off in the warmer summer months. By July, sunshine hours settle around 353, maintaining a vibrant atmosphere that characterizes the tropical climate. Notably, August and September witness a slight dip as the region experiences its rainiest season, yet the allure of the sun remains strong, with 349 and 313 hours, respectively. As the year winds down, sunshine hours remain relatively abundant, highlighting Guaynabo's status as a sunlit haven throughout the year.
In Guaynabo, Puerto Rico, the likelihood of sunny weather in January sits at a moderate 48%, marking it as a transitional month in the island's climate. While the sun shines with more prominence in the following months of February and March, boasting chances of 65% and 60% respectively, January reveals a hint of variability in the weather patterns. As winter gives way to spring, the probability of sunnier days indicates a gradual climb, while the summer months, particularly June through August, see a notable dip in sunshine with chances dropping to as low as 20%. Thus, January offers a balanced blend of sun and clouds, making it a pleasant backdrop for early-year activities while hinting at the brighter days ahead.
In Guaynabo, Puerto Rico, January welcomes a consistent 11 hours of daylight, setting the stage for a vibrant start to the year. This pattern continues into February, maintaining the same sunny offering. As March rolls in, daylight extends to 12 hours, hinting at the approaching spring season, a trend that persists through April and May as well. June and July peak with 13 hours of daylight, providing ample time for outdoor adventures under the tropical sun. By August and September, daylight gently tapers back to 12 hours, transitioning into the cooler months. October through December returns to the more subdued 11-hour daylight, mirroring January's bright beginning. This rhythmic ebb and flow showcases Guaynabo's delightful abundance of sunlight, inviting both locals and visitors to revel in its year-round warmth.
In Guaynabo, Puerto Rico, January greets residents with a gentle average wind speed of 3.1 m/s (7 mph), setting a serene tone for the month. As the year progresses into February, the winds pick up slightly, reaching 4.0 m/s (9 mph), which hints at the island's dynamic weather patterns. March follows closely with a moderate 3.4 m/s (8 mph), while April calms down a bit, dropping to 2.9 m/s (6 mph). This pattern of fluctuation continues, with the winds generally leaning towards the lighter side as summer approaches, peaking again in July at 4.0 m/s (9 mph) before tapering off in the fall months. Notably, September records the calmest winds at 2.4 m/s (5 mph), showcasing a seasonal dip that reflects a quieter time in nature. Overall, January's winds provide a refreshing start to the year, setting the stage for the shifts and rhythms of Puerto Rico's unique climate.
Weather in Guaynabo varies notably across the year, with each month offering distinct climate conditions. This page compares January’s weather to other months in Guaynabo, focusing on differences in temperature, rainfall, humidity, and UV levels.
In comparing January and February weather in Guaynabo, we see only slight variations in temperature and precipitation patterns. January experiences temperatures ranging from a minimum of 19°C (66°F) to a maximum of 29°C (84°F) with an average of 24°C (76°F). In contrast, February has a slightly warmer minimum of 20°C (69°F) and a comparable maximum of 28°C (83°F), maintaining an average of 24°C (75°F). Precipitation increases slightly in February, totaling 53 mm (2.1 in) over 18 days, compared to January's 48 mm (1.9 in) over 16 days. The humidity remains relatively stable, hovering around 76% in January and dipping slightly to 75% in February. For a detailed look at February's weather, you can visit Guaynabo weather in February.
In January, temperatures in Guaynabo range from a minimum of 19°C (66°F) to a maximum of 29°C (84°F), with an average of 24°C (76°F). The month sees a total precipitation of 48 mm (1.9 in) spread over 16 days and a humidity level of 76%. By March, the weather remains quite similar, with minimum temperatures slightly increasing to 20°C (69°F) while the maximum stays at 29°C (85°F), maintaining the average at 24°C (76°F). However, March experiences higher precipitation, totaling 80 mm (3.2 in) over 21 days, and a slightly lower humidity of 74%. For more information, visit Guaynabo weather in March.
January and April exhibit mild tropical weather, but with some distinctions. In January, temperatures range from a minimum of 19°C (66°F) to a maximum of 29°C (84°F), averaging around 24°C (76°F). This month also experiences 48 mm (1.9 in) of precipitation across 16 days, coupled with a humidity level of 76%. In contrast, April sees slightly warmer temperatures, with a minimum of 21°C (70°F) and a maximum of 30°C (86°F), averaging 25°C (77°F). However, this month has increased rainfall, totaling 77 mm (3.0 in) over 20 days, while humidity remains similar at 75%. For a more detailed look at the weather specifics, you can visit Guaynabo weather in April.
In January, the weather tends to be mild with temperatures ranging from a minimum of 19°C (66°F) to a maximum of 29°C (84°F), and an average of 24°C (76°F). The month sees approximately 48 mm (1.9 in) of precipitation, occurring over about 16 days, while the humidity hovers around 76%. In contrast, May brings warmer temperatures, with a minimum of 22°C (72°F) and a maximum of 31°C (87°F), averaging 26°C (79°F). However, May is also wetter, accumulating about 98 mm (3.9 in) of rainfall over 24 days, and the humidity remains relatively close at 75%. For more details on May's climate, you can check Guaynabo weather in May.
January and June exhibit notable differences in weather patterns. January has a milder temperature range, with minimums around 19°C (66°F) and maximums reaching 29°C (84°F), resulting in an average of 24°C (76°F). In contrast, June features higher temperatures, with minimums starting at 23°C (74°F) and maximums peaking at 31°C (88°F), leading to an average of 27°C (80°F). When it comes to precipitation, January experiences 48 mm (1.9 in) over 16 days, while June sees a significant increase, with 99 mm (3.9 in) over 23 days. Humidity levels remain fairly consistent, with January at 76% and June slightly higher at 77%. For more detailed information, you can check Guaynabo weather in June.
In comparing the weather between January and July, we see notable differences in temperature and precipitation patterns. January features a comfortable range with minimum temperatures around 19°C (66°F), averaging 24°C (76°F), and maxing out at 29°C (84°F). The month experiences around 48 mm (1.9 in) of precipitation spread over 16 days, with humidity levels at 76%. In contrast, July brings warmer temperatures, with a minimum of 23°C (74°F), an average of 27°C (81°F), and highs reaching 31°C (88°F). This month also faces increased rainfall, totaling 124 mm (4.9 in) over 24 days, along with a slight uptick in humidity at 80%. For more detailed information, you can visit Guaynabo weather in July.
When comparing the weather in January and August, it’s clear that both months offer distinct climates. January presents a milder temperature range with minimums around 19°C (66°F) and maximums reaching 29°C (84°F), accompanied by an average temperature of 24°C (76°F). However, it experiences less precipitation, with 48 mm (1.9 in) over 16 days, and a humidity level of 76%.
In contrast, August showcases warmer temperatures, with minimums at 23°C (74°F) and maximums of 31°C (89°F), leading to an average of 27°C (81°F). The month is also wetter, accumulating 130 mm (5.1 in) of rainfall over 25 days, and slightly higher humidity at 80%. This makes August a more humid and rainy month compared to the drier January. For more detailed information about August weather, visit Guaynabo weather in August.
In January, the weather is characterized by milder temperatures, with average highs around 29°C (84°F) and lower humidity levels at 76%. In contrast, September experiences warmer conditions, featuring average highs reaching 32°C (90°F) and slightly higher humidity at 79%. Additionally, September sees significantly increased precipitation, totaling 200 mm (7.9 in) over 27 days, compared to January's 48 mm (1.9 in) across 16 days. For more detailed information, you can check out Guaynabo weather in September.
In January, the weather is characterized by milder temperatures, with minimums around 19°C (66°F) and averages reaching 24°C (76°F). The month sees relatively low precipitation at 48 mm (1.9 in) over 16 days, while humidity hovers around 76%. In contrast, October brings warmer temperatures, with minimums of 23°C (74°F) and averages of 27°C (80°F), peaking at 31°C (88°F). However, October is much wetter, receiving 183 mm (7.2 in) of rain over 27 days, and slightly higher humidity at 78%. For more detailed insights, you can refer to Guaynabo weather in October.
In January, the weather features a minimum temperature of 19°C (66°F) and an average of 24°C (76°F), with a maximum reaching 29°C (84°F). The month sees moderate rainfall, with a total of 48 mm (1.9 in) spread over 16 days, and humidity levels at 76%. In contrast, November enjoys slightly warmer conditions, with a minimum temperature of 22°C (72°F) and an average of 26°C (79°F), peaking at 30°C (86°F). However, it is considerably wetter, experiencing 120 mm (4.7 in) of precipitation over 23 days and a humidity rate of 78%. For a detailed look at the specific weather patterns, check out Guaynabo weather in November.
In January, the weather features slightly cooler temperatures with a minimum of 19°C (66°F) and an average of 24°C (76°F), reaching a maximum of 29°C (84°F). In contrast, December tends to be warmer with minimum temperatures around 21°C (71°F) and an average of 25°C (77°F), peaking at 30°C (86°F).
Additionally, January experiences less precipitation, with about 48 mm (1.9 in) over 16 days, compared to December's higher total of 66 mm (2.6 in) across 22 days. Both months share a consistent humidity level of 76%, contributing to the tropical feel of the region. For more details on December weather, visit Guaynabo weather in December.
As January rolls around in Guaynabo, the weather presents a delightful contrast to the hotter months, offering mild temperatures and a refreshing atmosphere. With average daytime highs around 24°C (76°F) and cooler evenings, it’s an inviting time for locals and visitors alike. While the month does see some rainy days—typifying the region's tropical climate—these showers contribute to the lush greenery that defines the area. Overall, January encapsulates a unique blend of warmth and humidity, making it a perfect gateway for exploring the beauty of Guaynabo. For a deeper understanding of how these patterns unfold throughout the year, visit Guaynabo Climate.