Atenas Weather in December
In Atenas, December brings high daytime temperatures around 27°C (81°F), with nights cooling to 19°C (66°F). Expect quite a bit of rainfall this month.
Rainfall in Atenas in December
Typically around 15 days of rainfall are expected, averaging 100 mm (3.9 in) for the month. Individual showers can be quite heavy this month. A proper umbrella or rain jacket is worth having.
Temperature in Atenas in December
In December, expect high temperatures in Atenas, with highs of 27°C (81°F) and lows of 19°C (66°F) at night. Conditions stay fairly consistent through the month, making it easier to plan what to wear. With overnight lows of 19°C (66°F), evenings can feel noticeably cooler than the daytime. An extra layer is a good idea, though the cool air makes for a good night's sleep.
Sunshine in Atenas in December
With approximately 245 hours of sunshine, the days are filled with clear skies. It makes it a perfect month for being outside.If your ideal day consists of dry skies and pleasant temperatures, January, February and March typically offer the best circumstances for Atenas.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Costa Rica, check out our Atenas's climate page.
Atenas Temperature in December
Min Temperature
19°C (66°F)
Max Temperature
27°C (81°F)
Chance of Rain
48%
Precipitation
100 mm (3.9 in)
Rainy days
15 days
Humidity
82% *
Sunshine
245 hours *
Percentage Sunshine
*
Daily Historical Temperatures
44-year average (1976-2025)
Based on our historical records, temperatures in Atenas typically stay consistent throughout December, with daily highs averaging around 27°C (81°F). Nights are pleasant, with lows around 19°C (66°F).
Average temperatures in December
Daily Historical Precipitation
44-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in December
Historical weather for Atenas in December
Browse day-by-day weather records for Atenas spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Atenas historical weather extremes in December
Based on weather observations in Atenas between 1996 and 2025, these are the recorded extremes during December.
- The warmest day in December was on December 20, 1997, with a maximum of 33°C (91°F).
- The coldest December day was on December 11, 2017, with a maximum of 21°C (70°F).
- Atenas registered its coldest December night on December 7, 2010, with temperatures dropping to 13°C (55°F).
Best Places in Costa Rica in December
Find out more about the weather in Costa Rica and which places have the best travel conditions in this month. See all of Costa Rica in December →
perfect weather
pleasant
tolerable
unpleasant
poor
What to Wear in Atenas in December
Warm weather calls for comfortable, breathable clothing in December. Cotton t-shirts, shorts, light dresses, and sandals are perfect. You might still want a light layer for evenings or air-conditioned places (for example buses). High rain levels are expected, so pack waterproof gear and an umbrella or poncho. Don't forget sun protection, sunglasses, sunscreen, and a hat. These are all good ideas with this much sunshine.What To Do in Atenas in December
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Costa Rica, check out our Atenas's climate page.
Temperature Rainfall Sunshine Humidity
See the full Atenas climate overview or explore weather in Costa Rica.
