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.
Atenas Monthly Temperatures
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 January. 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:
Daily Historical Temperatures
42-year average (1976-2025)
Average high and low temperatures for each day of the month based on long-term records.
Average temperatures in June
Historical Atenas Temperatures: 1976-2026
Browse day-by-day temperature records for Atenas spanning 51 years. Select any month and year to see actual high and low temperatures recorded on each day.
Temperature: Atenas vs Costa Rica
The map below shows the annual temperature across Costa Rica. You can also select individual months if you want to compare a specific time of year.
very warm
warm
pleasant
moderate
cold
very cold
Atenas vs World: Temperature Compared
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.
What Does the Temperature Feel Like in Atenas?
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, January is the coolest month, with average highs of 28°C (82°F) and humidity around 80% — 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.
