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Monthly Weather Report – September 2024

Weather Station Reserve Karen Mogensen, Costa Rica

September 2024 presented itself as a typical phase of the peak rainy season at the Reserve Karen Mogensen, characterized by warm temperatures and high humidity, with frequent and abundant rainfall.

• Temperature
  • Monthly minimum temperature: 21.3°C (September 29)
  • Monthly maximum temperature: 31.3°C (September 15)
  • Monthly average temperature: 26.0°C
  • Temperatures showed moderate variation, with minimums ranging between 21.3°C and 24.2°C and maximums between 24.4°C and 31.3°C. The average temperature of the second and third ten-day periods decreased compared to the first, likely due to increased cloudiness and intense rainfall recorded during that time.
• Precipitation
  • Total monthly precipitation: 313.0 mm
  • Rainiest day: September 11 with 63.2 mm of rain
  • The distribution of rainfall was almost daily, with significant events mainly concentrated in the third ten-day period of the month, which recorded a total of 138 mm of rain—the highest value among the three periods. There were many days with light rain alternating with more intense events, typical of tropical climates during the wet season.
• Atmospheric Pressure and Humidity
  • Monthly average atmospheric pressure: 1013.5 hPa, with a narrow range between 1011.8 and 1015.4 hPa.
  • Monthly average relative humidity: 93.0%
  • Humidity remained high throughout the month, typical of the rainy season in this tropical region, with a maximum value of 95.4% and a minimum of 90.7%. The high humidity, combined with elevated temperatures, contributed to maintaining a particularly muggy environment.

Monthly Summary September 2024 was characterized by fully tropical weather conditions, with consistently high temperatures and a regular frequency of rain. The third ten-day period saw a significant increase in rainfall, with a peak in humidity and a decrease in daily maximum temperatures. These data indicate a transition toward an even wetter phase, typical of the beginning of autumn in the tropical region of Costa Rica.

In conclusion, the month was dominated by warm and humid conditions, with frequent rainfall episodes resulting in significant total precipitation, consistent with the seasonal characteristics of the Karen Mogensen Reserve during the rainy season.