Last updated: March 2, 2024
The weather in Monterrey, Costa Rica, during September is characterized by an average temperature of 18°C (65°F). Highs can soar to 24°C (75°F), while lows may dip to 14°C (57°F). Typically, the humidity level in Monterrey throughout September hovers around 81%.
Minimum temperature
Average temperature
Maximum temperature
Humidity
In September, Monterrey averages 508 mm (20.0 inches) of rainfall, typically over the course of 30 rainy days. The month enjoys an average of 12 hours 9 minutes of daylight, with the sun shining for approximately 7 hours 17 minutes each day. Additionally, there is a 8% probability of sunny days during this period.
Precipitation
Rainy days
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Chance of sun
In September, the UV Index in Monterrey reaches a maximum of 14, 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 | 12 | 14 | 14 | 12 | 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 | ||||||