Atenas Temperature by Month

Atenas, Alajuela, Costa Rica has a consistently comfortable climate year-round, with daytime highs averaging 28°C (82°F). Below you'll find a full monthly breakdown and a comparison with cities worldwide.

The climate in Atenas remains fairly constant, offering comfortable temperatures throughout the year. Maximum daytime temperatures reach a comfortable 29°C (84°F) in March, dropping to a comfortable 26°C (79°F) in October. Nighttime lows stay between 19°C (66°F) and 18°C (64°F).

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

Daily lows are most common between 4 AM and 6 AM. By 3 PM temperatures reach their daily high, driven by peak solar heating. March, the warmest month of the year, receives 282 hours of sunshine.

The chart below shows the average temperature throughout the year:

Atenas's average annual maximum temperature is 28°C (82°F). To put that in context, here's how it compares to a few well-known destinations:

Seville, Spain averages 23°C (73°F) a year, one of the warmer cities in Western Europe, with long hot summers.

Glasgow, Scotland averages 13°C (55°F) a year, mild but often grey, with cold winters and rarely hot summers.

San Francisco, USA averages 19°C (66°F) annually, but with little seasonal variation, summers are often cool and foggy, winters mild.

Perth, Australia averages 25°C (77°F) annually, with a classic Mediterranean climate, hot dry summers and mild wet winters.

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 Atenas, October is the coolest month, with average highs of 26°C (79°F) and humidity around 88%, considered very high. In March, the warmest month, temperatures average 29°C (84°F) with 80% humidity, conditions that feel very 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.

Whether a city sits on the coast or deep inland makes a significant difference to its climate. Coastal areas tend to have more stable temperatures year-round, large bodies of water absorb heat slowly in summer and release it gradually in winter, keeping extremes in check. Cities far from the sea don't benefit from that buffer, which is why continental climates tend to have hotter summers and colder winters than their coastal counterparts at the same latitude.

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