Fortuna Temperature by Month
Fortuna, 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.
Fortuna Monthly Temperatures
Fortuna enjoys a stable climate with temperatures staying pretty much the same throughout the year. Maximum daytime temperatures range from a comfortable 27°C (81°F) in January to a comfortable 30°C (86°F) in April. Nights are consistently cool, with lows between 20°C (68°F) and 19°C (66°F).
The chart below illustrates the average maximum day and minimum night temperatures in Fortuna 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. April, the warmest month of the year, receives 255 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 Fortuna Temperatures: 1976-2026
Browse day-by-day temperature records for Fortuna spanning 51 years. Select any month and year to see actual high and low temperatures recorded on each day.
Temperature: Fortuna 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
Fortuna vs World: Temperature Compared
Fortuna'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:
Barcelona, Spain has an annual average of around 21°C (70°F), with warm summers and mild, fairly short winters.
Glasgow, Scotland averages 13°C (55°F) a year — mild but often grey, with cold winters and rarely hot summers.
Osaka, Japan averages 22°C (72°F) annually, with hot humid summers, mild winters, and pleasant spring and autumn seasons.
Brisbane, Australia averages 26°C (79°F) a year, with warm winters and hot, humid summers.
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 Fortuna this rarely lasts long on the ground.
For more on Fortuna's weather — including monthly rainfall, sunshine hours, and humidity — visit our Fortuna climate page.
