Costa RicaAverage weather for Fortuna in September
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.
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. There are plenty of days with a good chance of precipitation.
With the temperature difference between day and night, it’s smart to wear layers.
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.
Since it cools down at night, it’s a good idea to wear layers.
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.
Because temperatures drop in the evening, wearing layers is recommended.
In September, there is an average of 301 mm of precipitation, spread over 19 days. The wind speed is around 4 Bft, mostly coming from the South.
Fortuna in September |
New York | ||
|---|---|---|---|
 Average temperature |
29°C | 27°C | |
 Max. temperature |
29°C | 31°C | |
| Min. temperature |
28°C | -5°C | |
 Total precipitation |
301 mm | 57 mm | |
| Rainy days |
19 days | 9 days | |
August
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.
Is September a good time to visit Fortuna?
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.
The hurricane season in Fortuna runs from June to November.
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.
Check out the climate of Fortuna for all months and discover the best travel time
Daily Temperature in September in Fortuna
This chart shows the average daily high and low temperatures in September for Fortuna, in degrees Celsius. The red line represents the highs, and the blue line shows the lows. The days of the month are displayed at the bottom of the chart. The data, based on historical observations, provide the average temperatures for this month.
Daily Precipitation in September in Fortuna
The chart below shows the average daily precipitation in September for Fortuna, measured in millimeters over the past few years. Precipitation is always measured as water, even if it’s snow or hail. The days of the month are listed at the bottom of the chart.
A low average precipitation means that the chance of rain on that day is usually small, while a higher average suggests that it rained more often. But remember, it’s just an average, and every day can be different. Based on historical weather data for September, you can expect about 19 days of precipitation in Fortuna.
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.
Temperature in September in Fortuna over the years
This chart shows the average temperature in September in Fortuna, measured in degrees Celsius, over the past few years.
Total precipitation in September in Fortuna over the years
This chart shows the average precipitation in September in Fortuna, measured in millimeters over the past years. Precipitation is always measured as water, whether it’s snow or hail.
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.
Weather experiences in September in Fortuna
Have you been to Fortuna in September?
Share your weather experience in September in Fortuna.
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.
