Last updated: March 2, 2024
The weather in La Fortuna, Costa Rica, during September is characterized by an average temperature of 24°C (75°F). Highs can soar to 30°C (87°F), while lows may dip to 20°C (69°F). Typically, the humidity level in La Fortuna throughout September hovers around 84%.
Minimum temperature
Average temperature
Maximum temperature
Humidity
In September, La Fortuna averages 277 mm (10.9 inches) of rainfall, typically over the course of 29 rainy days. The month enjoys an average of 12 hours 9 minutes of daylight, with the sun shining for approximately 8 hours 19 minutes each day. Additionally, there is a 11% probability of sunny days during this period.
Precipitation
Rainy days
Sunshine hours
Chance of sun
In September, the UV Index in La Fortuna reaches a maximum of 13, indicating a level of Extreme exposure. The most intense UV radiation typically occurs between 11:00 and 13:00, during which unprotected skin may burn in as little as 10 minutes.
| 07:00 | 08:00 | 09:00 | 10:00 | 11:00 | 12:00 | 13:00 | 14:00 | 15:00 | 16:00 | 17:00 | 18:00 | 19:00 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UVI | 2 | 5 | 8 | 11 | 13 | 13 | 11 | 8 | 4 | 2 | 1 | 0 | 0 |
| Exposure | Low | Moderate | VeryHigh | Extreme | VeryHigh | Moderate | Low | ||||||
| Time to burn | 45 min | 30 min | 15 min | 10 min | 15 min | 30 min | 45 min | ||||||