Costa RicaThe weather in September in Fortuna
It's warm in September in Fortuna with an average temperature of 29°C. Temperatures this month range from a low of 28°C to a high of 29°C. At night, you can expect temperatures between 20°C and 21°C.
Looking for sun? September isn’t a good month to be in Fortuna. 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 Fortuna, 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 36°C in 2023, Fortuna 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 25°C.
Rainfall amount
In September, there is an average of 301 mm of precipitation, spread over 26 days. The wind speed is around 4 Bft, mostly coming from the South.
Daily weather in September for Fortuna
Click on any day in September to get detailed info about the usual weather on that day in Fortuna. Check out the historical temperatures and precipitation over the past 10 years on this day.
September weather comparison
| Fortuna | New York | |
|---|---|---|
| Average temperature | 29°C | 27°C |
| Max. temperature | 29°C | 31°C |
| Min. temperature | 20°C | -5°C |
| Total precipitation | 301 mm | 57 mm |
| Rainy days | 26 days | 9 days |
Start of September
The month of September starts in Fortuna with hot temps, averaging around 29°C during the day and nights around 21°C.
Mid September
By mid-September, daytime temps stay steady at around 29°C, with nights around 21°C. There’s a high chance of precipitation during this time.
End of September
By the end of September, the average daytime temperature in Fortuna is around 29°C, while nighttime temps are about 21°C. There’s a significant chance of many days with precipitation.
Find affordable trips to Fortuna
UV index
The UV index is a maximum of 9 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 Fortuna runs from June to November.
Check out the climate of Fortuna for all months and discover the best travel time
Temperature charts
These charts show the average temperatures in September in Fortuna, 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 Fortuna
Temperature in September in Fortuna over the years
Precipitation charts
These charts show the average amount of precipitation in September in Fortuna, 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 Fortuna
Total precipitation in September in Fortuna over the years
Daily UV index in September in Fortuna
This chart shows the average daily UV index in September in Fortuna, 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 Fortuna
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Average weather in Fortuna by month
Click on a month below to see detailed weather info for Fortuna. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.