October weather forecast
Jaco, Costa Rica

In Jaco, Costa Rica, October follows September's trend with high rainfall and humidity affecting the overall weather pattern. Despite this, there are still plenty of hours of sunshine, illuminated by the vibrant flora brought about by the rains. Sea temperatures linger in the warm spectrum, encouraging water activities during sunny interludes. The wind retains a gentle and consistent speed, helping to create breezy evenings. Despite being deep into the wet season, outdoor activities continue to prosper due to steady warm temperatures.

Temperature

The coldest time of the year is October, with temperatures averaging a high of 28.1°C (82.6°F) and a low of 25.2°C (77.4°F).

Heat index

The heat index in October is estimated at a hot 32°C (89.6°F). If activity and exposure persist, they could induce fatigue, leading to possible heat cramps.
Metrics for the heat index primarily focus on shaded spots and light wind conditions. Direct sunlight can cause a surge in the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', shows a temperature sensation when both heat and moisture conditions are combined. This effect is subjective, differing among individuals based on their physical activity and perception of heat, which can be influenced by factors like wind, clothing, and metabolic variances. In direct sunlight, the heat's impact can be heightened, potentially leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold particular significance for children. Young children are more at risk than adults since they tend to sweat less. Moreover, their large skin surface in proportion to their small bodies and the high heat production due to their activities contribute to their vulnerability.

Humidity

The months with the highest humidity are June and October, with an average relative humidity of 80%.

Rainfall

The month with the most rainfall is October, when the rain falls for 26.1 days and typically aggregates up to 383mm (15.08") of precipitation.

Sea temperature

In Jaco, the average seawater temperature in October is 28°C (82.4°F).
Note: Water temperatures between 25°C (77°F) and 29°C (84.2°F) are regarded as very warm, ensuring all water activities are pleasurable for extended periods without feeling uneasy.

Daylight

In October, the average length of the day is 11h and 55min.
On the first day of the month, sunrise is at 05:26 and sunset at 17:28. On the last day of October, in Jaco, sunrise is at 05:28 and sunset at 17:15 CST.

Sunshine

October has the least sunshine of the year in Jaco, with an average of 8.1h of sunshine.

UV index

The months with the highest UV index in Jaco 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 of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV radiation for the average person.
Note: The maximum daily UV index of 7 during October translates into the following directions:
Apply measures and align with sun safety principles. Safeguarding against skin and eye injury is pivotal. The hours from 10 a.m. to 4 p.m. have the most intense UV radiation. As much as possible, limit direct sun exposure during this period. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses. Caution! Sand and water reflections can notably increase the UV radiation intensity.