Last updated: August 21, 2025
January in Jaco, Costa Rica offers a delightful tropical experience, with temperatures comfortably ranging from a maximum of 29°C (85°F) to an average of 27°C (81°F) and a minimum of 25°C (77°F). Visitors can expect a touch of moisture, as January sees about 36 mm (1.4 in) of rainfall spread across seven days, contributing to a humidity level of 68%. This blend of warm weather and occasional showers creates an ideal setting for outdoor adventures, surfing, and soaking up the vibrant local culture. Whether you're lounging on the beach or exploring the surrounding nature, January is a fantastic time to experience the beauty of Jaco.
In January, Jaco, Costa Rica, welcomes visitors with inviting temperatures that are consistently warm throughout the month. The minimum stays comfortably at 25°C (77°F), while the average hovers around a pleasant 27°C (81°F), peaking at a delightful 29°C (85°F). This trend of mild temperatures continues into February, indicating a stable climate perfect for beach activities and outdoor adventures. As the months progress, temperatures remain relatively stable, with the averages only fluctuating slightly, underscoring Jaco's tropical charm. Whether you’re lounging on the beach or exploring the lush surroundings, January offers a vibrant start to the year in this idyllic paradise.
In January, Jaco, Costa Rica experiences a relatively moderate precipitation level of 36 mm (1.4 in), falling over approximately 7 days. This marks the beginning of the year with a gentle transition from the dryness of December, transitioning into the lush greenery that comes with the rainy season. As the months progress, precipitation increases significantly, reaching a peak in October with a staggering 638 mm (25.1 in) over 30 days. The rainy months of May through October showcase a pronounced pattern, with rainfall intensifying and occurring almost daily, while the early months, including February and March, feature noticeably lower levels of precipitation—just 12 mm and 13 mm respectively. This pattern highlights the seasonal shift in Jaco, where gentle January rains gradually pave the way for the vibrant tropical downpours that define the latter half of the year.
In January, Jaco, Costa Rica, experiences a comfortable humidity level of 68%, which continues into February, maintaining that same refreshing atmosphere. As the months progress, humidity dips slightly in March to 66% before rising again to 67% in April. The onset of May introduces a gradual increase, peaking at 69%, as the region transitions toward its lush rainy season. From June to August, the air becomes notably more humid, with levels soaring to 84% in June and reaching 85% in July, providing a tropical feel that persists through August at 82%. As the year winds down, humidity begins to decrease, settling back to 80% in both October and November before finishing the year at a more moderate 72% in December. This pattern highlights Jaco's shift from a pleasantly humid start to a more intense tropical experience during the mid-year months, embracing the lush vibrancy that defines this coastal paradise.
In January, Jaco, Costa Rica experiences a UV Index of 11, categorized as extreme, indicating that sun exposure can lead to skin damage in just 10 minutes. As the month progresses into February and March, the UV Index increases to 13, maintaining that extreme classification and the same burn time. This trend continues into April and May, where the UV Index peaks at 14, still requiring only 10 minutes for potential burns. Notably, this high level of UV intensity holds steady through the summer months into September. October slightly stabilizes the index at 13, while November and December see a slight decline to 11 and 10, respectively. It’s crucial for sunbathers and outdoor enthusiasts to be aware of these persistent extremes. For more detailed UV data, check out Jaco UV Index.
UV Risk Categories
January in Jaco, Costa Rica, shines with 259 hours of sunlight, setting the tone for a month filled with warmth and outdoor adventures. As the sun begins its ascent, February offers even more brightness with 299 hours, leading into the slightly warmer March, which boasts 332 hours of glorious sunshine—the peak of solar delight for the first quarter. Though April sees a slight dip to 310 hours, the light remains plentiful. As the year transitions into the rainy season, May to July experiences a gradual decline, hovering around 257 to 260 hours. However, by October, the hours of sunlight drop to 223, signaling a cool retreat into the lush landscapes of Costa Rica's rainy season. Interestingly, as the year winds down, November rings in a surge with 266 hours, and December basks in a radiant 311 hours, reminding visitors that the beauty of Jaco shines bright, no matter the season.
In Jaco, Costa Rica, January boasts a 54% chance of sunny weather, a promising start to the year for sun-seekers. This favorable probability remains consistent into February, where the likelihood of sunshine holds steady at 54%. As the months progress into March, the chances increase slightly to 58%, indicating a gradual transition into the dryer, sunnier period. However, the weather notably shifts after March, with April plunging to 25%, and May seeing a further decline to 17%. The trend continues through the mid-year months, where the likelihood of sunshine drops significantly, plummeting to as low as 6% in August. By the year's end, the chances slowly recover, hinting at a return to sunnier days by December. Overall, January stands out as one of the best months to enjoy Jaco's sun-filled landscapes, setting the tone for an inviting start to the Costa Rican year.
In Jaco, Costa Rica, January offers 11 hours of daylight, a consistent feature shared with both October and November, setting a tranquil tone for the New Year. As the months unfold, daylight duration begins to shift, with February maintaining the same 11 hours, before gradually increasing to 12 hours from March through August. This prolonged daylight during the mid-year months invites adventure and exploration, ideal for enjoying the stunning beaches and lush landscapes. As autumn approaches, daylight hours taper back to 11 hours in October, reclaiming the peaceful ambiance that January initiated. This pattern of fluctuating daylight, with a peak in mid-year, highlights Jaco's unique rhythm, allowing visitors to savor each moment, whether basking in sunlight or embracing the serene evenings.
In January, Jaco, Costa Rica, enjoys a gentle breeze with an average wind speed of 2.6 m/s (6 mph), setting a pleasant tone for the month. This calmness is mirrored in February and April, maintaining the same pace, while March sees a slight uptick to 2.8 m/s (6 mph). The heart of the dry season displays a consistent wind pattern, creating ideal conditions for beachgoers and water sports enthusiasts alike. As the months progress into mid-year, the wind picks up slightly, peaking in August at 3.2 m/s (7 mph) before returning to familiar territory in September. By the end of the year, winds moderate once again, with December closing out the year at 2.3 m/s (5 mph). Overall, the wind speeds in Jaco present a delightful rhythm, perfect for both relaxation and adventure under the sun.
Weather in Jaco varies notably across the year, with each month offering distinct climate conditions. This page compares January’s weather to other months in Jaco, focusing on differences in temperature, rainfall, humidity, and UV levels.
In January, the weather features consistent temperatures with a minimum of 25°C (77°F), an average of 27°C (81°F), and a maximum of 29°C (85°F). However, it also sees higher precipitation levels, totaling 36 mm (1.4 in) across 7 days, resulting in a moderately humid atmosphere with 68% humidity. In comparison, February maintains the same temperature range but experiences significantly less rainfall, with only 12 mm (0.5 in) over just 3 days. This reduction in precipitation contributes to a more favorable climate for outdoor activities. For a detailed look at the weather conditions, you can check Jaco weather in February.
In January, the weather features warm temperatures, with a minimum of 25°C (77°F) and an average of 27°C (81°F), peaking at 29°C (85°F). This month receives about 36 mm (1.4 in) of precipitation over approximately 7 days, accompanied by a humidity level of 68%. In contrast, March sees slightly warmer averages, with an average temperature of 28°C (82°F) while maintaining the same maximum temperature of 29°C (85°F). However, March experiences significantly less precipitation, totaling only 13 mm (0.5 in) over just 3 days, and a humidity level that is slightly lower at 66%. For a detailed look at the weather in Jaco, you can check out Jaco weather in March.
In January, the weather typically features warm temperatures, with a minimum of 25°C (77°F) and a maximum of 29°C (85°F), accompanied by relatively low precipitation of 36 mm (1.4 in) over about 7 days. In contrast, April maintains similar air temperatures, but the rainfall significantly increases to 130 mm (5.1 in), occurring on 21 days, which results in a slightly lower humidity level of 67%. This shift highlights April as a wetter month while preserving the same warm temperature range. For more detailed information, you can refer to Jaco weather in April.
In January, the weather in Jaco is characterized by warm temperatures, with a minimum of 25°C (77°F), an average of 27°C (81°F), and a maximum of 29°C (85°F). Precipitation during this month totals 36 mm (1.4 in) over 7 days, accompanied by a humidity level of 68%. In contrast, May sees similar temperatures, with a minimum of 25°C (77°F), an average of 27°C (81°F), and a maximum of 29°C (84°F). However, the rainfall significantly increases, with a staggering 474 mm (18.7 in) spread over 30 days, resulting in a slightly higher humidity of 69%. For a more detailed look at the weather conditions in May, check out this link: Jaco weather in May.
In comparing the weather between January and June, it's evident that both months experience similar average temperatures, ranging from a minimum of 25°C (77°F) to a maximum of 29°C (85°F). However, June is significantly wetter, with precipitation levels soaring to 393 mm (15.5 in) over 29 days, compared to January's modest 36 mm (1.4 in) over just 7 days. Additionally, humidity increases in June to 84%, from January's 68%. This shift indicates a transition into the rainy season, making June's weather notably more humid and rainy. For more detailed information, you can check Jaco weather in June.
In January, the weather is warm and relatively pleasant, with temperatures ranging from a minimum of 25°C (77°F) to a maximum of 29°C (85°F) and an average of around 27°C (81°F). Precipitation is moderate, with about 36 mm (1.4 in) spread over 7 days, resulting in a more comfortable humidity level of 68%. In contrast, July sees similar temperature ranges, with minimums at 25°C (77°F) and maximums peaking at 29°C (84°F), but the rainfall dramatically increases to 358 mm (14.1 in) over 30 days, leading to a higher humidity of 85%. For more detailed insights on weather during this month, check out Jaco weather in July.
In January, the weather features warm temperatures, with a minimum of 25°C (77°F) and a maximum of 29°C (85°F), accompanied by moderate humidity at 68%. The precipitation is relatively low, totaling 36 mm (1.4 in) over about 7 days. In contrast, August sees similar temperatures, with a minimum of 25°C (77°F) and a slightly lower maximum of 28°C (83°F). However, this month is characterized by significantly higher precipitation at 495 mm (19.5 in) spread across 30 days, and increased humidity at 82%. This stark difference in rainfall highlights the contrasting weather patterns between the two months. For more detailed information, check out Jaco weather in August.
In January, the weather is typically warm and dry, with temperatures ranging from a minimum of 25°C (77°F) to a maximum of 29°C (85°F). Precipitation is relatively low, with only 36 mm (1.4 in) falling over about 7 days, resulting in a humidity level of 68%. In contrast, September presents a much wetter climate, with temperatures slightly cooler, peaking at 28°C (83°F) but often experiencing significant rainfall. Precipitation during this month rises dramatically to 461 mm (18.2 in) spread over 29 days, contributing to a higher humidity level of 81%. For more details about the weather conditions in September, check out Jaco weather in September.
The weather in January is generally warm and pleasant, with temperatures ranging from a minimum of 25°C (77°F) to a maximum of 29°C (85°F) and an average of 27°C (81°F). Precipitation is relatively low, totaling 36 mm (1.4 in) over about 7 days, resulting in a humidity level of 68%. In contrast, October experiences slightly cooler temperatures, with a minimum of 25°C (77°F), an average of 26°C (79°F), and a maximum of 28°C (82°F). However, rainfall is significantly higher, with 638 mm (25.1 in) spread over 30 days, and humidity increases to 80%. For more detailed information, you can check Jaco weather in October.
In January, the weather is relatively warm, with temperatures ranging from a minimum of 25°C (77°F) to a maximum of 29°C (85°F), and an average of 27°C (81°F). Precipitation is moderate, totaling 36 mm (1.4 in) over about 7 days, accompanied by a humidity of 68%.
In contrast, November sees similar temperatures, with a minimum of 25°C (76°F), an average of 26°C (79°F), and a maximum of 28°C (82°F). However, it experiences significantly higher precipitation of 303 mm (11.9 in) spread over 26 days, along with increased humidity at 80%. This stark difference highlights how November is much wetter compared to the drier January months. For more details on the weather conditions, check out Jaco weather in November.
In January, the weather in Jaco offers slightly warmer temperatures, with a minimum of 25°C (77°F) and an average of 27°C (81°F), compared to December's minimum of 24°C (76°F). Both months have similar maximum temperatures, reaching up to 29°C (85°F) in January and 29°C (84°F) in December. However, January experiences significantly less rainfall, receiving only 36 mm (1.4 in) over 7 days, while December sees much more precipitation at 125 mm (4.9 in) spread over 16 days. The humidity remains fairly consistent, with January at 68% and December at 72%. For those interested in more details, you can explore Jaco weather in December.
As January unfolds in Jaco, visitors can expect warm and inviting temperatures, with averages comfortably settling around 27°C (81°F). This month typically offers a pleasant reprieve from the heavier rains of the wet season, featuring only a modest 36 mm of precipitation spread over about seven days. With humidity levels around 68%, January strikes a delightful balance between warmth and moisture, making it an ideal time for outdoor activities. Compared to other months, where rainfall may be more frequent and temperatures can vary more significantly, January's reliable weather invites travelers to enjoy the beauty of this vibrant coastal town. For more insights on the region's climate, check out Jaco Climate.