San Isidro weather in September (San José, Costa Rica)

What should you pack for a trip to San Isidro in September? Check out our in-depth weather guide for this month.

Temperatures

Typically, September in San Isidro includes high temperatures and heavy rainfall. Daytime temperatures hover around 24°C, while nights can cool down to about 17°C.

Precipitation

San Isidro in September falls under the rainy season with heavy rainfall, averaging around 655 mm for the month. Records from the past 30 years suggest that around 23 days will experience rain.

Average sunshine

The city usually sees around 153 hours of sunlight, indicating a moderately sunny period.

If you're looking for dry conditions and comfortable temperatures, September may not be the ideal month to visit San Isidro. January, February and March typically offer the most agreeable circumstances. On the other hand, May, June, July, August, September, October and November tend to be characterized by conditions that may not be as optimal.

For an in-depth look at the yearly conditions, visit our specialized San Isidro climate page with graphs.

 

San Isidro, monthly averages in September

Min Temperature 17°C  

Max Temperature 24°C  

Chance of Rain 77%  

Precipitation 655 mm  

Rainy days 23 days  

Humidity 83% *  

Sunshine 153 hours *  

Percentage Sunshine *  

Data from: Quepos, Costa Rica (50 KM, 31 Miles).

Where to go in Costa Rica in September

Find out more about the weather in Costa Rica and which places have the best travel conditions in this month.

Weather conditions Weather

Temperatures

Precipitation

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Legend perfect weather pleasant tolerable unpleasant poor

Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C and 29°C and not too much precipitation (less than 90 mm a month).

So, what should you wear in this month?

For visitors traveling to San Isidro, we recommend wearing layers. So maybe a skirt, t-shirt, shorts for during the day and jeans and a warm jacket for some days and evenings. Bring a rain jacket in case it rains during your stay. Plan on layering your clothes.

What To Do

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Interested in more climate information?

This site provides you with all the information you need about the climate in San Isidro.

Our site offers climate and forecast data for every country in the world. Are you going to Costa Rica? On this website you can find historical weather averages for many cities in Costa Rica. Not sure yet where to go? We now have a tool which recommends destinations that suit your ideal travel conditions. Find out where to go with our weather planner.