December weather forecast and climate
Jaco, Costa Rica

Temperature

September through December, with an average high-temperature of 29°C (84.2°F), are the coldest months.

Rainfall

December is the last month it rains. During 13 rainfall days, Jaco aggregates 20mm (0.8") of precipitation. Throughout the year, in Jaco, there are 185 rainfall days, and 2615mm (103") of precipitation is accumulated.

Sea temperature

In Jaco, the average water temperature is 28.2°C (82.8°F). For swimming, diving, and other water activities, temperatures between 25°C (77°F) and 29°C (84.2°F) are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.

Daylight

Months with the shortest days are January and December, with an average of 11.6h of daylight.

Sunshine

In December, the average sunshine is 6h.

UV index

With an average UV index of 10, December is the month with the lowest UV index in Jaco, Costa Rica.

What is the coldest month in Jaco?

September through December, with an average high-temperature of 29°C (84.2°F), are the coldest months.

What is the temperature in December in Jaco?

The average high-temperature, in December, in Jaco, Costa Rica, is 29°C (84.2°F), while the average low-temperature is 22°C (71.6°F).

What is the last month it rains in Jaco?

December is the last month it rains in Jaco, Costa Rica. During 13 rainfall days, in December, Jaco aggregates 20mm (0.8") of precipitation.

What is the water temperature in December in Jaco?

In Jaco, Costa Rica, in December, the average water temperature is 28.2°C (82.8°F). For swimming, diving, and other water activities, temperatures between 25°C (77°F) and 29°C (84.2°F) are perceived as very enjoyable and pleasurable for prolonged periods without feeling uncomfortable.

What is the month with the shortest days in Jaco?

Months with the shortest days in Jaco are January and December, with an average of 11.6h of daylight.

What is the average length of the day in December in Jaco?

The average length of the day in December is 11.6h.

How many hours of sunshine does Jaco have in December?

In Jaco, the average sunshine in December is 6h.

What is the month with the lowest UV index in Jaco?

December is the month with the lowest UV index in Jaco, Costa Rica, with an average UV index of 10.

What is the UV index reading in December in Jaco?

In December, the average UV index in Jaco is 10.
Average temperature in December - Jaco, Costa Rica
  • Average high temperature in December: 29°C

Warmest months (with the highest average high temperature) are March and April (32°C).
Months with the lowest average high temperature are September, October, November and December (29°C).

  • Average low temperature in December: 22°C

Months with the highest average low temperature are March, April and May (24°C).
Coldest months (with the lowest average low temperature) are September, October, November and December (22°C).

Average rainfall in December - Jaco, Costa Rica
  • Average rainfall in December: 20mm

The wettest month (with the highest rainfall) is October (503mm).
The driest month (with the lowest rainfall) is January (0mm).

Average rainfall days in December - Jaco, Costa Rica
  • Average rainfall days in December: 13 days

Months with the highest number of rainy days are June, August and September (22 days).
Months with the lowest number of rainy days are February and March (7 days).

Average sea temperature in December - Jaco, Costa Rica
  • Average sea temperature in December: 28.2°C

The best month for swimming (with the highest average sea temperature) is March (29.4°C).
The coldest month (with the lowest average sea temperature) is November (27.8°C).

Average daylight in December / Average sunshine in December - Jaco, Costa Rica
  • Average daylight in December: 11.6h

The month with the longest days is June (Average daylight: 12.7h).
Months with shortest days are January and December (Average daylight: 11.6h).

  • Average sunshine in December: 6h

Months with most sunshine are February, March and April (Average sunshine: 8h).
Months with least sunshine are September and October (Average sunshine: 5).

Average UV index in December - Jaco, Costa Rica
  • Average UV index in December: 10

Months with the highest UV index are February, March, April, May, June, July, August, September and October (UV index 12).
The month with the lowest UV index is December (UV index 10).

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