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

Interested in knowing the climate of San José in September? Get all the weather information you need to plan your visit.

Temperatures

Typically, September in San José includes high temperatures and heavy rainfall. During the day, temperatures usually reach up to 24°C. At night, they tend to fall to approximately 16°C.

Precipitation

San José in September falls under the rainy season with heavy rainfall, averaging around 476 mm for the month. Expect around 24 days of rain based on historical data.

Average sunshine

With about 149 hours of sunshine, the area enjoys a nice balance of sun and clouds, creating a pleasant environment.

If you prefer dry days with pleasant temperatures, September may not be the ideal month to visit San José. January, February and March typically offer the most optimal weather. In contrast, May, June, July, August, September, October and November tend to have less optimal conditions.

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

 

San José, monthly averages in September

Min Temperature 16°C  

Max Temperature 24°C  

Chance of Rain 79%  

Precipitation 476 mm  

Rainy days 24 days  

Humidity 85%  

Sunshine 149 hours  

Percentage Sunshine  

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 José, 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.

Swimming

7/10

Camping

6/10

Interested in more climate information?

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

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.