The weather in September in Costa Rica
It's warm in September in Costa Rica with an average temperature of 27°C. Temperatures this month range from a low of 26°C to a high of 28°C. At night, you can expect temperatures between 18°C and 20°C.
Looking for sun? September isn’t a good month to be in Costa Rica. The temperature is nice, but there’s too much chance of rain.
Average temperatures and precipitation
This chart shows the average daily maximum and minimum temperatures (in degrees Celsius) and precipitation (in millimeters) in September for Costa Rica. A low precipitation value usually indicates little to no rainfall on that day in recent years, while a higher value suggests more frequent rainfall.
Temperature records
With 31°C in 2015, Costa Rica reached the highest temperature in September over the past 10 years. The lowest daytime temperature in this month was 23°C in 2014. The extreme nighttime temperatures ranged from a lowest recorded value of 10°C to a highest value of 23°C.
Rainfall amount
In September, there is an average of 284 mm of precipitation, spread over 26 days. The wind speed is around 4 Bft, mostly coming from the South.
Daily weather in September for Costa Rica
Click on any day in September to get detailed info about the usual weather on that day in Costa Rica. Check out the historical temperatures and precipitation over the past 10 years on this day.
September weather comparison
| Costa Rica | New York | |
|---|---|---|
| Average temperature | 27°C | 27°C |
| Max. temperature | 28°C | 31°C |
| Min. temperature | 18°C | -5°C |
| Total precipitation | 284 mm | 57 mm |
| Rainy days | 26 days | 9 days |
Start of September
The month of September starts in Costa Rica with hot temps, averaging around 28°C during the day and nights around 20°C.
Mid September
By mid-September, daytime temps stay steady at around 28°C, with nights around 20°C. There’s a high chance of precipitation during this time.
End of September
By the end of September, the average daytime temperature in Costa Rica is around 28°C, while nighttime temps are about 19°C. There’s a significant chance of many days with precipitation.
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UV index
The UV index is a maximum of 8 this month. That's a very high value on the intensity scale of 1 to 11. Unprotected skin can burn within 10-15 minutes.
The hurricane season in Costa Rica runs from June to November.
Check out the climate of Costa Rica for all months and discover the best travel time
The climate in Costa Rica is based on weather data from San José. Other spots might have different weather. You can check out all destinations in Costa Rica to get the full picture of the climate.
Temperature charts
These charts show the average temperatures in September in Costa Rica. The temperatures are shown in degrees Celsius and are calculated based on data from the past 10 years.
Daily Temperature in September in Costa Rica
Temperature in September in Costa Rica over the years
Precipitation charts
These charts show the average amount of precipitation in September in Costa Rica. Precipitation is always measured as water, even when it falls as snow or hail The amount of precipitation is displayed in millimeters, while snowfall is shown in centimeters.
Daily Precipitation in September in Costa Rica
Total precipitation in September in Costa Rica over the years
Daily UV index in September in Costa Rica
This chart shows the average daily UV index in September in Costa Rica, with the UV index ranging from 0 to a maximum of 11. The bottom of the chart shows the days of the month. Based on historical data, this chart provides an idea of the daily UV radiation levels you can expect.
Weather experiences in September in Costa Rica
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Average weather in Costa Rica by month
Click on a month below to see detailed weather info for Costa Rica. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.