Daytime highs, nighttime lows and the warmest cities in Alajuela, Costa Rica this September.
Alajuela, Costa Rica, a region in Costa Rica, experiences maximum daytime temperatures in September ranging from 25°C (77°F) in Birrí to 31°C (88°F) in Los Chiles. Nighttime temperatures generally drop to 23°C (73°F) in Los Chiles and 17°C (63°F) in Birrí.
To get a sense of September's typical temperatures in the key spots of Alajuela, explore the map below. Click on a point for an in-depth look.
Check the conditions for any month of the year.
Click on a destination dot for more details. Toggle the map to compare temperatures or precipitation across Alajuela.
Marker color shows the average daytime high temperature in September: blue is cold, red is hot.
Fortuna averages a daytime high of 29°C (84°F) in September, which is high for Alajuela, Costa Rica.
Nighttime temperatures in Fortuna typically drop to around 21°C (70°F) in September.
Data insights from our comprehensive database indicate that Los Chiles is the city with the highest warmth. Daytime peaks average near 31°C (88°F), while the nights are characterized by a low temperature close to 23°C (73°F).
In our database, Birrí is the chilliest city in September in Alajuela, Costa Rica. Daytime temperatures typically peak at 25°C (77°F), while the nighttime lows hover around 17°C (63°F).
Most cities enjoy a balanced amount of sunshine, with around 159 hours of sunlight anticipated in Fortuna. This ensures the days are neither too dim nor excessively sunny.
We have much more information about the climate in Alajuela.
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