Last updated: August 31, 2025
January in Isabela, Puerto Rico, offers a warm tropical escape, with maximum temperatures reaching 29°C (84°F) and an average of 25°C (77°F). Mornings are refreshingly cool, dropping to a minimum of 20°C (69°F). Although visitors can enjoy the idyllic weather, they should prepare for some rain, as the area experiences 34 mm (1.3 in) of precipitation over 11 days. The humidity holds steady at a comfortable 76%, creating a pleasant environment for both relaxation and adventure. Whether you're exploring its beautiful beaches or indulging in local cuisine, January is a wonderful time to discover the charm of Isabela.
In January, Isabela, Puerto Rico welcomes visitors with pleasantly warm temperatures, boasting a comfortable range from a minimum of 20°C (69°F) to a maximum of 29°C (84°F), while the average settles at 25°C (77°F). This delightful winter climate sets the stage for outdoor adventures, with temperatures gradually rising as the months progress. By February, the mercury nudges slightly upward, especially at night where it reaches 21°C (69°F). As spring approaches, March and April maintain a similar average, offering stable, enjoyable warmth. It's notable that by May, the temperatures increase, with highs often reaching 31°C (88°F), signaling the onset of a tropical warmth that remains consistent through the summer months. Overall, January serves as a perfect introduction to Isabela’s inviting climate, striking a balance between enjoyable warmth and refreshing breezes that continue to beckon throughout the year.
January in Isabela, Puerto Rico, sets the stage for the year's weather patterns with a modest precipitation total of 34 mm (1.3 in) spread over 11 days. This slightly below-average rainfall marks a transition from the drier December, paving the way for the wetter months ahead. As the island moves into February, a slight increase to 39 mm (1.5 in) suggests a gradual uptick in moisture, leading into the heart of the rainy season. This upward trend continues significantly in March and April, where precipitation nearly doubles, reaching 72 mm (2.8 in) and 66 mm (2.6 in), respectively. These increases foreshadow the crux of the rainy season, highlighting how January serves as an essential precursor to the subsequent surge in precipitation that characterizes the spring months in Isabela.
In January, Isabela, Puerto Rico, welcomes the year with a comfortable average humidity of 76%, setting a pleasant tone for the month. This humidity level is slightly higher than February's 75%, but it stabilizes through the early spring months, hovering around 74% to 75% from March to May. As summer approaches in June, humidity levels rise to 77%, continuing the upward trend, peaking at 80% in July and August. This peak reflects the tropical climate, where humidity remains consistently high throughout the summer before beginning to taper off to 79% in September and easing back to 76% by year-end. Overall, January serves as a gentle introduction to the predominantly humid conditions that characterize Isabela throughout the year.
In January, Isabela, Puerto Rico experiences a very high UV Index of 9, indicating a significant need for sun protection, with a burn time of just 15 minutes. As the year progresses into February, the index escalates to 11 and shifts into the extreme exposure category, further enhancing the urgency for caution in the sun. This trend of increasing UV levels continues through the spring and summer months, peaking at 14 in May, before stabilizing at a consistent 13 from June through September. As autumn approaches, UV levels gradually decrease to 12 in October, then return to very high readings of 9 in November and 8 in December, suggesting a seasonal fluctuation that emphasizes the importance of sun safety year-round. Stay informed and prepared by checking the latest updates at Isabela UV Index.
UV Risk Categories
January in Isabela, Puerto Rico, ushers in 261 hours of sunshine—a promising start to the year. As winter progresses, the daylight begins to intensify; February sees a boost to 307 hours, setting the stage for a steady sunshine increase. By March, hours climb to 347, and April peaks at 352 hours, heralding the vibrant days of spring. The trend continues into the summer, with May and July both enjoying 361 hours, showcasing the region's sun-drenched allure. Even as the year wanes, Isabela maintains a favorable climate, with October and November providing 316 and 298 hours, respectively. This gradual yet consistent rise in sunshine hours emphasizes the appeal of Isabela's warm, welcoming skies, making it a perfect getaway for sun-seekers year-round.
In January, Isabela, Puerto Rico experiences a moderate 54% chance of sunny weather, making it a promising time for outdoor activities and exploration. While this figure is slightly lower than what you'll find in February, which boasts a remarkable 77% sunshine probability, it still offers plenty of sunshine opportunities as the winter months bring clearer skies. As spring approaches, the likelihood of sunny days fluctuates, peaking at 66% in March, before settling again in April at 50%. This trend indicates that while January isn't the sunniest month of the year, it certainly lays the groundwork for the sunnier days ahead, making it a delightful time to enjoy the beauty of this vibrant coastal locale.
In January, Isabela, Puerto Rico, enjoys approximately 11 hours of daylight, a consistent feature that extends into February. As spring approaches in March, daylight begins to stretch to 12 hours, revealing a gradual increase that continues through April and May. This trend peaks in the summer months of June and July, where residents bask in 13 hours of sunlight, perfect for beach outings and outdoor activities. As the year transitions back to fall in August and September, daylight diminishes slightly but remains steady at 12 hours. By October through December, daylight recedes to 11 hours once again, closing the year with a familiar rhythm of light and dark that characterizes Puerto Rico's enchanting tropical climate.
In January, Isabela, Puerto Rico greets the New Year with an average wind speed of 5.0 m/s (11 mph), setting a refreshing tone for the month. As the winter season progresses into February, the winds pick up slightly, reaching 5.7 m/s (13 mph), before tapering back to 5.1 m/s (11 mph) in March. April ushers in a noticeable decline, dropping to 3.8 m/s (9 mph), which continues its downward trend into May and September, with the lowest recorded at 3.7 m/s (8 mph). However, the winds regain their momentum in October, leading into a more stable range from November through December, showcasing a gentle resurgence at 4.3 m/s (10 mph) and peaking again at 5.4 m/s (12 mph). This rhythmic cycle of wind speeds reflects the island's climate, transitioning from brisk beginnings in winter to the calmer breezes of late summer and back again, creating a delightful symphony of nature's breath throughout the year.
Weather in Isabela varies notably across the year, with each month offering distinct climate conditions. This page compares January’s weather to other months in Isabela, focusing on differences in temperature, rainfall, humidity, and UV levels.
In January, the weather features average temperatures around 25°C (77°F), with a minimum of 20°C (69°F) and a maximum of 29°C (84°F). There is some precipitation, totaling 34 mm (1.3 in) over approximately 11 days, and the humidity sits at 76%. In contrast, February sees a slight increase in minimum temperature to 21°C (69°F), with similar average temperatures but reaching a higher maximum of 30°C (86°F). Precipitation also rises to 39 mm (1.5 in) over 13 days, accompanied by a marginally lower humidity level of 75%. For more details, check out Isabela weather in February.
In January, the weather in Isabela features warm temperatures with a minimum of 20°C (69°F) and an average of 25°C (77°F), reaching a maximum of 29°C (84°F). The month sees relatively low precipitation, totaling 34 mm (1.3 in) over 11 days, accompanied by a humidity level of 76%. In contrast, March experiences slightly warmer nights with a minimum temperature of 21°C (70°F), while the average remains at 25°C (76°F) and the maximum hovers around 29°C (84°F). However, March brings increased rainfall, totaling 72 mm (2.8 in) across 17 days, and the humidity dips slightly to 74%. For more details on March weather, you can check Isabela weather in March.
In January, temperatures range from a minimum of 20°C (69°F) to a maximum of 29°C (84°F), with an average of 25°C (77°F). The month sees about 34 mm (1.3 in) of precipitation over 11 days, and humidity levels are relatively high at 76%. In contrast, April experiences slightly warmer temperatures, with a minimum of 22°C (72°F) and a maximum of 30°C (86°F), while maintaining a similar average of 25°C (78°F). However, April tends to be wetter, receiving approximately 66 mm (2.6 in) of rainfall across 14 days, and a slightly lower humidity of 75%. For more details on the specific weather conditions during this month, check out Isabela weather in April.
In comparing the weather between January and May, we see a noticeable increase in temperatures as the year progresses. January has a minimum temperature of 20°C (69°F) and an average of 25°C (77°F), with a maximum reaching 29°C (84°F). In contrast, May begins at a higher minimum of 23°C (74°F) and averages 26°C (79°F), peaking at 31°C (88°F). Additionally, precipitation levels rise significantly in May, totaling 97 mm (3.8 in) over 19 days, compared to January's 34 mm (1.3 in) across just 11 days. Humidity remains fairly steady, hovering around 76% in January and slightly lower at 75% in May. For more details on May's weather patterns, you can visit Isabela weather in May.
In January, temperatures in Isabela range from a mild 20°C (69°F) to a comfortable 29°C (84°F), with an average of 25°C (77°F). The month sees about 34 mm (1.3 in) of precipitation over 11 days, and humidity levels hover around 76%. In contrast, June experiences warmer temperatures, with a minimum of 24°C (76°F) and a maximum of 31°C (88°F), averaging 27°C (81°F). Rainfall increases significantly to 85 mm (3.3 in) across 17 days, while humidity remains slightly higher at 77%. For more details on the June climate in Isabela, visit Isabela weather in June.
In January, the weather is typically warm, with temperatures ranging from a minimum of 20°C (69°F) to a maximum of 29°C (84°F), and an average of 25°C (77°F). The month sees about 34 mm (1.3 in) of precipitation over roughly 11 days, with humidity levels at 76%. In contrast, July experiences slightly warmer conditions, with temperatures fluctuating between 24°C (76°F) and 31°C (88°F), averaging at 27°C (81°F). However, it is also wetter, with a total of 91 mm (3.6 in) of rainfall spread out over 18 days and a higher humidity of 80%. This difference highlights the transition from the drier, moderately humid January to the more humid and rainy July. For more detailed information, check Isabela weather in July.
In comparing the weather between January and August, January typically features milder temperatures with a minimum of 20°C (69°F) and an average of 25°C (77°F), while August tends to be warmer, with a minimum temperature of 24°C (76°F) and an average of 27°C (82°F). Additionally, August experiences higher maximum temperatures, peaking at 32°C (89°F) compared to January's maximum of 29°C (84°F). Precipitation also differs significantly, as January receives 34 mm (1.3 in) over 11 days, whereas August sees a much higher 97 mm (3.8 in) over 20 days. The humidity levels are somewhat similar, with January at 76% and August slightly higher at 80%—indicative of the more humid, wetter conditions characteristic of late summer months. For more detailed insights, you can check Isabela weather in August.
In January, the weather is typically warm, with temperatures ranging from a minimum of 20°C (69°F) to a maximum of 29°C (84°F) and an average of 25°C (77°F). The month features relatively low precipitation at 34 mm (1.3 in), with rain falling on about 11 days and humidity sitting at a comfortable 76%. In contrast, September experiences higher temperatures, with a minimum of 25°C (77°F) and a maximum of 31°C (88°F), averaging around 27°C (81°F). However, it is significantly wetter, receiving 188 mm (7.4 in) of rain over approximately 23 days and slightly higher humidity at 79%. For more detailed insights on weather during this month, check Isabela weather in September.
In January, temperatures in Isabela typically range from a minimum of 20°C (69°F) to a maximum of 29°C (84°F), with an average of 25°C (77°F). The month experiences relatively low precipitation, at 34 mm (1.3 in) over 11 days, and humidity levels are around 76%.
In contrast, October sees warmer temperatures, with a minimum of 24°C (76°F) and a maximum of 31°C (88°F), averaging 27°C (81°F). This month is significantly wetter, receiving 127 mm (5.0 in) of rainfall over 21 days, and humidity increases slightly to 78%. For more detailed information on October weather, you can check Isabela weather in October.
In January, the weather typically features a minimum temperature of 20°C (69°F) and an average of 25°C (77°F), reaching a maximum of 29°C (84°F). The month sees less precipitation, recording about 34 mm (1.3 in) over 11 days, with humidity around 76%. In contrast, November experiences slightly warmer temperatures with minimums of 23°C (74°F), averages of 26°C (79°F), and maximums of 30°C (85°F). Rainfall is significantly higher in November, totaling 99 mm (3.9 in) across 19 days, and the humidity is marginally higher at 78%. For a detailed look at November's climate, visit Isabela weather in November.
In comparing the weather of January and December, both months maintain a warm climate with minimal variation in average temperatures. January showcases a temperature range with a minimum of 20°C (69°F) and a maximum of 29°C (84°F), while December's temperatures are slightly higher, featuring a minimum of 23°C (73°F) and a maximum of 30°C (86°F). Precipitation levels are also notable; January experiences 34 mm (1.3 in) of rain over 11 days, whereas December sees a bit more with 43 mm (1.7 in) spread across 15 days. Both months share a consistent humidity level of 76%. For a more in-depth look at December's weather, you can visit Isabela weather in December.
January in Isabela offers a refreshing respite from the warmth of the summer months, with temperatures that typically hover around a comfortable 25°C (77°F). Unlike the dry heat of the later months, January experiences a moderate humidity level of 76%, bringing a pleasant tropical feel to the air. Precipitation, while present on 11 days, is generally lighter, resulting in an average of 34 mm for the month. This blend of warmth and moisture makes January an ideal time for visitors seeking to enjoy the lush landscapes and vibrant culture without the intensity of the peak summer heat. For a deeper dive into what you can expect throughout the year, check out the full details on Isabela Climate.