Birrí Temperature by Month

The average annual maximum temperature in Birrí, Alajuela, Costa Rica is 25°C (77°F), with little variation between seasons. This page covers monthly averages, day-night differences, and how Birrí compares to cities worldwide.

The temperature in Birrí changes very little across the seasons, maintaining a similar climate throughout the year. Maximum daytime temperatures range from a comfortable 24°C (75°F) in January to a comfortable 26°C (79°F) in April. Nighttime lows range from 17°C (63°F) in April to 16°C (61°F) in January.

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

The coolest part of the day is typically between 4 AM and 6 AM, while 3 PM is usually the warmest, when solar heating is at its peak. April, the city's warmest month, averages 241 hours of sunshine.

The chart below shows the average temperature throughout the year:

Birrí's average annual maximum temperature is 25°C (77°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.

Interlaken, Switzerland averages 8°C (46°F) a year, with cold winters and cool summers thanks to its Alpine setting.

Shanghai, China averages 21°C (70°F) a year, with warm summers, mild winters, and a noticeable spring and autumn.

Melbourne, Australia averages 20°C (68°F) annually, known for unpredictable weather, with four seasons sometimes happening in one day.

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 Birrí, January is the coolest month, with average highs of 24°C (75°F) and humidity around 68%, considered high. In April, the warmest month, temperatures average 26°C (79°F) with 70% 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.

Global average temperatures have risen by around 1.2°C since the pre-industrial era, and the effects are visible across many regions. Winters are milder on average, with fewer frost days and less snow in many parts of the world. Heatwaves are more frequent and more intense, and Europe's summers of 2018, 2019, and 2020 all set records.

Summers are also getting drier in some areas, while winter rainfall has increased in others. This contributies to higher river levels and more flooding. In many countries, spring arrives earlier and autumn lasts longer. It has knock-on effects for wildlife, agriculture, and local ecosystems.

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