Nuevo Arenal Temperature by Month

Nuevo Arenal, Guanacaste, Costa Rica has a consistently comfortable climate year-round, with daytime highs averaging 29°C (84°F). Below you'll find a full monthly breakdown and a comparison with cities worldwide.

The temperature in Nuevo Arenal remains steady throughout the year, providing a consistently very warm climate. Maximum daytime temperatures range from a very warm 31°C (88°F) in April to a comfortable 28°C (82°F) in January. Nights are mild year-round, with lows ranging from 21°C (70°F) in April to 20°C (68°F) in January.

The chart below illustrates the average maximum day and minimum night temperatures in Nuevo Arenal by month:

Temperatures tend to bottom out between 4 AM and 6 AM, then climb to their daily peak around 3 PM.

The chart below shows the average temperature throughout the year:

Nuevo Arenal's average annual maximum temperature is 29°C (84°F). To put that in context, here's how it compares to a few well-known destinations:

Rome, Italy averages 20°C (68°F) annually, with reliably warm summers and comfortable winters.

Toronto, Canada averages 13°C (55°F) annually, with cold snowy winters balanced by genuinely warm summers.

Buenos Aires, Argentina averages 23°C (73°F) a year, with hot summers and mild winters, and seasons reversed compared to Europe.

Tokyo, Japan averages 21°C (70°F) a year, with hot summers, cool winters, and a well-defined cherry blossom spring.

Temperature alone doesn't tell the whole story, humidity plays a big role in how warm or cold it actually feels. High humidity in summer makes the heat feel more intense, particularly once temperatures climb above 25°C. In winter, the same humidity can make cold air feel sharper than the thermometer suggests.

In Nuevo Arenal, January is the coolest month, with average highs of 28°C (82°F) and humidity around 86%, considered very high. In April, the warmest month, temperatures average 31°C (88°F) with 78% humidity, conditions that feel high. For a full picture, see our humidity page.

Climate temperature data is typically calculated as a 30-year average. This smooths out year-to-year variability and gives a more reliable picture of what a place is actually like, rather than what happened in any single unusual year.

The readings come from a range of sources, land-based weather stations, ocean buoys, ships, and satellites. That data is collected by weather services around the world, then pooled, quality-checked, and averaged to produce the climate records you see here.

Seasonal temperature shifts influence more than just how warm it feels, they also drive changes in rainfall, cloud cover, and wind patterns throughout the year.

Warmer air holds more moisture, which tends to mean heavier or more frequent rain during the warmer months. When temperatures drop in winter, any precipitation that does fall is more likely to come as snow or sleet, though in Nuevo Arenal this rarely lasts long on the ground.

For more on Nuevo Arenal's weather, including monthly rainfall, sunshine hours, and humidity, visit our Nuevo Arenal climate page.