December weather forecast
San José, Costa Rica

englishespañol中文
Share
Skyscape of San José, Costa Rica in the evening sun
Skyscape of San José, Costa Rica in the evening sun

Weather in December

In December, San José welcomes a lessened intensity of rainfall and a consistent thermal profile. Conditions in December align with November's trends making this a conducive period for outdoor pursuits. With showers continuing to diminish gradually, the city transforms into a haven for locals and tourists seeking to end their year amid the city's fascinating weather patterns.

Temperature

The high-temperature average in December for San José is a moderately hot 23.4°C (74.1°F), staying closely aligned with November's conditions. Throughout December, San José witnesses a consistent average low-temperature of 14°C (57.2°F).

Humidity

In December, the average relative humidity is 84%.

Rainfall

In San José, in December, during 19.5 rainfall days, 65mm (2.56") of precipitation is typically accumulated. In San José, during the entire year, the rain falls for 287.8 days and collects up to 2585mm (101.77") of precipitation.

Daylight

The month with the shortest days is December, with an average of 11h and 36min of daylight.
On the first day of the month, sunrise is at 05:38 and sunset at 17:13. On the last day of December, in San José, Costa Rica, sunrise is at 05:52 and sunset at 17:26 CST.

Sunshine

In December, the average sunshine in San José is 7.8h.

UV index

The months with the highest UV index are January through December, with an average maximum UV index of 5. January through December, with an average maximum UV index of 5, are months with the lowest UV index in San José, Costa Rica. A UV Index reading of 3 to 5 represents a medium health hazard from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: In December, the maximum UV index of 5 translates into these guidelines:
Be vigilant - A duty to shield skin and eyes from injury exists. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Employ a wide-brim hat for potent defense against up to 50% of UV rays.

Frequently asked questions

What is the average December temperature in San José?

An average high-temperature, in December, in San José, is 23.4°C (74.1°F) and the average low-temperature is 14°C (57.2°F).

What is the average humidity in December in San José?

The average relative humidity in December in San José is 84%.

How much does it rain in San José in December?

In San José, Costa Rica, during December, the rain falls for 19.5 days and regularly aggregates up to 65mm (2.56") of precipitation.

What is the month with the shortest days in San José?

The month with the shortest days is December, with an average of 11h and 36min of daylight.

What is the average length of the day in December in San José?

In December, the average day length in San José, Costa Rica, is 11h and 34min.

When is the sunrise / sunset in December in San José?

In December, on the first day of the month, sunrise is at 05:38 and sunset at 17:13. On the last day of the month, in San José, sunrise is at 05:52 and sunset at 17:26 CST.

How long on average sun shines in December in San José?

In December, the average sunshine duration in San José is 7.8h.

What is the month with the highest UV index in San José?

The months with the highest UV index are January through December, with an average maximum UV index of 5.

When is the lowest UV index in San José?

The months with the lowest UV index are January through December, with an average maximum UV index of 5.

How high is the UV index in December in San José?

The average daily maximum UV index in December is 5. A UV Index value of 3 to 5 symbolizes a medium health risk from exposure to Sun's UV rays.

Average temperature in December
San José, Costa Rica

Average temperature in December - San José, Costa Rica
  • Average high temperature in December: 23.4°C

The warmest month (with the highest average high temperature) is April (26°C).
The month with the lowest average high temperature is October (22.4°C).

  • Average low temperature in December: 14°C

The month with the highest average low temperature is June (17°C).
The coldest month (with the lowest average low temperature) is January (13.8°C).

Average pressure in December
San José, Costa Rica

Average pressure in December - San José, Costa Rica
  • Average pressure in December: 1011.7mbar

The month with the highest atmospheric pressure is January (1012.3mbar).
The month with the lowest atmospheric pressure is October (1010.8mbar).

Average wind speed in December
San José, Costa Rica

Average wind speed in December - San José, Costa Rica
  • Average wind speed in December: 9km/h

The windiest month (with the highest average wind speed) is February (10.7km/h).
The calmest month (with the lowest average wind speed) is September (4.3km/h).

Average humidity in December
San José, Costa Rica

Average humidity in December - San José, Costa Rica
  • Average humidity in December: 84%

The months with the highest relative humidity are September and October (91%).
The months with the lowest relative humidity are February and March (75%).

Average rainfall in December
San José, Costa Rica

Average rainfall in December - San José, Costa Rica
  • Average rainfall in December: 65mm

The wettest month (with the highest rainfall) is October (438mm).
The driest month (with the least rainfall) is February (26mm).

Average rainfall days in December
San José, Costa Rica

Average rainfall days in December - San José, Costa Rica
  • Average rainfall days in December: 19.5 days

The month with the highest number of rainy days is October (30.5 days).
The month with the least rainy days is February (12.2 days).

Average daylight in December /
Average sunshine in December
San José, Costa Rica

Average daylight in December / Average sunshine in December - San José, Costa Rica
  • Average daylight in December: 11h and 4min

The month with the longest days is June (Average daylight: 12h and 42min).
The month with the shortest days is December (Average daylight: 11h and 36min).

  • Average sunshine in December: 7h and 5min

The month with the most sunshine is February (Average sunshine: 9h and 12min).
The month with the least sunshine is October (Average sunshine: 5h and 48min).

Average sunshine days in December
San José, Costa Rica

Average sunshine days in December - San José, Costa Rica
  • Average sunshine days in December: 9.1 days

The month with the most sunshine days is March (13.5 days).
The month with the least sunshine days is September (0.1 days).

Average UV index in December
San José, Costa Rica

Average UV index in December - San José, Costa Rica
  • Average UV index in December: 5

The months with the highest UV index are January, February, March, April, May, June, July, August, September, October, November and December (UV index 5).
The months with the lowest UV index are January, February, March, April, May, June, July, August, September, October, November and December (UV index 5).

Average cloud cover in December
San José, Costa Rica

Average cloud cover in December - San José, Costa Rica
  • Average cloud cover in December: 45

The month with the most cloud cover is October (Cloud cover 68).
The month with the least cloud cover is February (Cloud cover 30).

Average visibility in December
San José, Costa Rica

Average visibility in December - San José, Costa Rica
  • Average visibility in December: 8km

The months with the highest visibility are January, February and March (9km).
The months with the lowest visibility are August, September, October and November (6km).

San José, Costa Rica

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location