San Isidro Temperatures: Monthly Averages and Year-Round Insights
On this page, we’ll explore San Isidro’s temperature statistics in detail, including day and night variations and monthly averages. We’ll also compare the annual temperature to other cities in Costa Rica.
Monthly Temperature Averages
The climate in San Isidro remains fairly constant, offering comfortable temperatures throughout the year. Average maximum daytime temperatures reach a comfortable 25°C in April. In January, the coolest month of the year, temperatures drop to a comfortable 23°C. At night, minimum temperatures can drop even lower, averaging around 16°C.
The chart below illustrates the average maximum day and minimum night temperatures in San Isidro by month:
The lowest temperatures typically occur between 4 AM and 6 AM, while the peak temperatures are generally observed around 3 PM, when the sun's heating is most intense. April, the city’s warmest month, enjoys 240 hours of sunshine.
The chart below shows the average temperature throughout the year:
January, the city’s coldest month, sees about 124 mm of rainfall spread over roughly 12 days. It records 270 hours of sunshine of sunshine.
Annual Temperatures in Costa Rica Compared
The map below shows the annual temperature across Costa Rica. You can also select the different months in case you are interested in a specific month.
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San Isidro Temperatures Compared World Wide
San Isidro’s average annual maximum temperature is 24°C. Let’s compare this with some popular tourist destinations:
In Barcelona, Spain, the average annual temperature is around 21°C, resulting in warm summers and mild winters throughout the year.
In Toronto, Canada, the average annual temperature is 13°C, with snowy winters and warm summers.
In Shanghai, China, the annual average temperature is 21°C, offering warm summers and mild winters.
Melbourne, Australia, has a slightly cooler climate, with an average annual temperature of 20°C.
How does the temperature feel?
Humidity is an essential factor in how you experience temperature. When a warm period is accompanied by high humidity, it results in a higher perceived temperature. This is especially true when temperatures exceed 25°C, as it can cause greater discomfort.
In San Isidro, during the coolest month, January, you will experience 80% humidity, which is considered very high. This is accompanied by an average maximum temperature of 24°C. In the warmest month, April, the humidity is 79% combined with an average maximum temperature of 25°C, which creates a high-feel temperature. Explore our detailed page on humidity levels for further details.
How are these Temperatures Measured?
Generally, temperature data depicting climate is usually given over a 30-year average in order to reduce short-term fluctuations and reveal better long-term trends in climate conditions.
This temperature data is taken from land-based thermometers, ocean buoys, ships, and satellites. These measurements are transmitted to weather stations and climate centers around the globe where they are processed, averaged, and analyzed in order to monitor the trends and create climate models.
Temperatures in the Mountains
Although not all regions have mountains, elevated areas exhibit distinct temperature variations.
- Sun Exposure: Sunlit slopes tend to be warmer, while shaded areas remain cooler.
- Altitude Effects: Temperatures drop by approximately 6°C for every 1,000 meters of elevation, creating distinct microclimates.
For more detailed information about San Isidro’s weather, including monthly rainfall, sunshine hours, and humidity levels, visit our San Isidro climate page.
Current temperature in San Isidro
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