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Costa RicaThe climate of Unión
The current climate in Unión features temperatures ranging from a high of 31°C to a low of 28°C throughout the year. The average yearly temperature is around 30°C. At night, temperatures in the colder months average around 19°C and in the warmer months around 21°C.
Average temperatures and precipitation
This chart shows the average monthly maximum and minimum temperatures (in degrees Celsius) and average monthly rainfall (in millimeters) for Unión, Costa Rica.
Temperature records
The highest temperature recorded in Unión in recent years was 38°C in May 2023. The lowest daytime temperature recorded was 20°C in November 2016.
Rainfall amount
On average, Unión receives 1806 mm of precipitation each year. For comparison, New York gets 1142 mm of precipitation annually.
The hurricane season in Unión runs from June to November.
Best time to visit Unión?
The best time to visit Unión for sunny weather is January through April and December. During this period, you'll have nice temperatures and not too much rain, making it a great time to visit Unión. In the other months of the year, there's too much rain or the temperature isn't ideal for a visit if you want sunny and pleasant weather.
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Climate Table of Unión
The climate table of Unión shows the average temperatures, rainfall, and UV index per month. The table provides an overview of the average day and night temperatures in degrees Celsius, the total amount of rainfall in millimeters, the total snowfall in centimeters, and the UV index for each month. Rainfall is always measured as water, even if it's snow or hail.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
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| Temp. max (°C) | 29 | 29 | 31 | 31 | 30 | 29 | 29 | 29 | 29 | 28 | 28 | 29 |
| Temp. min (°C) | 20 | 20 | 21 | 21 | 22 | 21 | 21 | 21 | 21 | 21 | 21 | 21 |
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| Precipitation (mm) | 7,1 | 1,6 | 2,7 | 75 | 261 | 221 | 156 | 212 | 301 | 327 | 213 | 28 |
| UV Index | 8 | 9 | 9 | 9 | 8 | 7 | 7 | 7 | 8 | 7 | 7 | 8 |
Click on the month name to see more weather details, like daily averages, temperatures, and precipitation for the past years in that month.
Temperature charts
These charts display the average temperatures in Unión, Costa Rica. The temperatures are shown in degrees Celsius and are calculated based on data from the past 10 years.
Average Temperature per Month in Unión
Yearly Temperature in Unión
Precipitation charts
These charts show the average amount of precipitation in Unión, 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.
Average Precipitation per Month in Unión
Total Yearly Precipitation in Unión
UV index chart
This chart shows the average UV index per month in Unión, Costa Rica. The UV index indicates the intensity of ultraviolet radiation and ranges from 0 to a maximum of 11.
Average UV Index per Month in Unión
Weather experiences in Unión
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Average weather in Unión by month
Click on a month below to see detailed weather info for Unión. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.