January weather forecast
Jaco, Costa Rica

January sees a transition period in Jaco, Costa Rica, as the dry season starts to settle. Temperatures remain steady, ranging from 24.5°C (76.1°F) to 29.5°C (85.1°F), providing warmth without it being stifling. The relative humidity is at 70%, contributing to an overall comfortable climate, making January a welcoming month for outdoor activities. On the contrary, water enthusiasts can find solace in sea temperatures that remain pleasantly warm. Winds during January are gentle, helping to moderate the heat and maintain pleasant conditions.

Temperature

Jaco measures an average high-temperature of a still moderately hot 29.5°C (85.1°F) in January, nearly consistent with the preceding month. Jaco experiences a steady nighttime temperature of 24.5°C (76.1°F) throughout the month of January.

Heat index

Throughout January, the heat index is estimated at a tropical 34°C (93.2°F). Ensure heightened precautions, risk of heat cramps and heat exhaustion is significant. Sustained activity could provoke heatstroke.
Remember that heat index calculations are made for conditions in the shade with light wind. When under direct sunshine, the heat index may be elevated by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'real feel', is a measure of how hot it feels when the actual air humidity is factored in. Factors including metabolic differences, physical activity, and clothing are additional elements that influence the individual's temperature experience. Direct sun rays can make one feel hotter, potentially raising the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values remain especially vital for babies and toddlers. Children often miss understanding the importance of rest and rehydration. Thirst usually appears late during dehydration - therefore, maintaining hydration, particularly during long physical activities, is essential.

Humidity

The average relative humidity in January in Jaco is 70%.

Rainfall

In Jaco, in January, during 9.3 rainfall days, 22mm (0.87") of precipitation is typically accumulated. Throughout the year, there are 236.2 rainfall days, and 1501mm (59.09") of precipitation is accumulated.

Sea temperature

In Jaco, the average seawater temperature in January is 28°C (82.4°F).
Note: Surface water temperatures between 25°C (77°F) and 29°C (84.2°F) are perceived as excellent and extremely agreeable for enduring enjoyment in water activities.

Daylight

In January, the average length of the day in Jaco is 11h and 38min.
On the first day of January, sunrise is at 05:54 and sunset at 17:29. On the last day of the month, sunrise is at 06:00 and sunset at 17:43 CST.

Sunshine

In Jaco, the average sunshine in January is 8.6h.

UV index

The months with the highest UV index are January through December, with an average maximum UV index of 7. January through December, with an average maximum UV index of 7, are months with the lowest UV index. A UV Index value of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV rays for the ordinary person.
Note: The maximum daily UV index of 7 in January converts into the following recommendations:
Take precautions and utilize sun safety practices. Protection against skin and eye damage is required. Limit your direct sun exposure, especially between 10 a.m. and 4 p.m., when UV radiation is strongest. Shade structures might not provide complete sun protection. Boost your sun resistance with garments that are densely woven yet spacious. Attention! UV strength is notably upped by the reflection of sand and water.