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Costa RicaThe weather in December in Arenal
It's hot in December in Arenal with an average temperature of 33°C. Temperatures this month range from a low of 32°C to a high of 34°C. At night, you can expect temperatures between 21°C and 24°C.
December is an awesome month to be in Arenal for sunny weather. You’ll have high temperatures and not much chance of rain this month.
Average temperatures and precipitation
This chart shows the average daily maximum and minimum temperatures (in degrees Celsius) and precipitation (in millimeters) in December for Arenal, Costa Rica. A low precipitation value usually indicates little to no rainfall on that day in recent years, while a higher value suggests more frequent rainfall.
Temperature records
With 37°C in 2023, Arenal reached the highest temperature in December over the past 10 years. The lowest daytime temperature in this month was 26°C in 2023. The extreme nighttime temperatures ranged from a lowest recorded value of 17°C to a highest value of 27°C.
Rainfall amount
In December, there is an average of 11 mm of precipitation, spread over 2 days. The wind speed is around 5 Bft, mostly coming from the East.
Daily weather in December for Arenal
Click on any day in December to get detailed info about the usual weather on that day in Arenal. Check out the historical temperatures and precipitation over the past 10 years on this day.
December weather comparison
| Arenal | New York | |
|---|---|---|
| Average temperature | 33°C | 9°C |
| Max. temperature | 34°C | 12°C |
| Min. temperature | 21°C | -5°C |
| Total precipitation | 11 mm | 133 mm |
| Rainy days | 2 days | 17 days |
Start of December
The month of December starts in Arenal with hot temps, averaging around 33°C during the day and nights around 23°C.
Mid December
By mid-December, daytime temps stay steady at around 33°C, with nights around 23°C. No precipitation expected during this period, so you can enjoy plenty of sunshine.
End of December
By the end of December, the average daytime temperature in Arenal is around 33°C, while nighttime temps are about 23°C. No precipitation expected at the end of the month; it’ll be mostly sunny.
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UV index
The UV index is a maximum of 8 this month. That's a very high value on the intensity scale of 1 to 11. Unprotected skin can burn within 10-15 minutes.
The hurricane season in Arenal runs from June to November.
Check out the climate of Arenal for all months and discover the best travel time
Temperature charts
These charts show the average temperatures in December in Arenal, Costa Rica. The temperatures are shown in degrees Celsius and are calculated based on data from the past 10 years.
Daily Temperature in December in Arenal
Temperature in December in Arenal over the years
Precipitation charts
These charts show the average amount of precipitation in December in Arenal, Costa Rica. Precipitation is always measured as water, even when it falls as snow or hail The amount of precipitation is displayed in millimeters, while snowfall is shown in centimeters.
Daily Precipitation in December in Arenal
Total precipitation in December in Arenal over the years
Daily UV index in December in Arenal
This chart shows the average daily UV index in December in Arenal, with the UV index ranging from 0 to a maximum of 11. The bottom of the chart shows the days of the month. Based on historical data, this chart provides an idea of the daily UV radiation levels you can expect.
Weather experiences in December in Arenal
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Average weather in Arenal by month
Click on a month below to see detailed weather info for Arenal. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.