September weather forecastRío Alejandro, Panama
September
Weather in September
Entering September, the atmospheric shift in Río Alejandro has hints of the drying period approaching days. Despite September being within the monsoon season, the city experiences reductions in average rainfall and relative humidity. The leisurely winds coupled with the decline in number of sunniest days are characteristic of the slowly changing climate. The wind speed further decreases to 7.3km/h (4.5mph) from 7.8km/h (4.8mph) in August, suggesting calmer afternoons. A subtle transformation ensues, paving the path for alluring climatic novelties in the upcoming months.Temperature
The commencement of September records an average high-temperature of a still warm 28.7°C (83.7°F), barely varying from August's 28.5°C (83.3°F). Río Alejandro, during September nights, experiences a subtle shift to a low average of 25.1°C (77.2°F) from the day's heat.Heat index
For most parts of September, the heat index is evaluated at a torrid 35°C (95°F). Greater preventive actions are needed, heat exhaustion and heat cramps are likely. Persistent activity could provoke heatstroke.Thinking about the heat index, one should account for its values in shaded areas with gentle breezes. Uninterrupted exposure to the sun may boost the heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'real feel', combines air temperature and relative humidity to represent a human perceived temperature equivalent. Elements such as metabolic variations, pregnancy, and physical exertion can influence one's weather perception. It is noteworthy to mention that direct sunlight exposure can augment the felt temperature, leading to an increase in the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values hold great significance to children. Young individuals are generally in more danger than adults due to their lower capacity to sweat. Moreover, their large skin surface in relation to their small bodies and the increased heat generation from their activities makes them more vulnerable.
The body's natural response to excessive warmth is perspiration, as it allows for cooling through sweat evaporation. An increase in relative humidity retards evaporation, subsequently reducing the body's heat removal rate and leading to a sensation of being overly warm. As the body gains more heat than it can dissipate, there's a risk of increasing temperatures and resultant overheating.
Humidity
In Río Alejandro, the average relative humidity in September is 84%.Rainfall
In September, in Río Alejandro, the rain falls for 24.2 days. Throughout September, 88mm (3.46") of precipitation is accumulated. Throughout the year, there are 266.8 rainfall days, and 1014mm (39.92") of precipitation is accumulated.Daylight
In September, the average length of the day in Río Alejandro is 12h and 10min.On the first day of the month, sunrise is at 06:10 and sunset at 18:27. On the last day of September, sunrise is at 06:07 and sunset at 18:10 EST.
Sunshine
In September, the average sunshine in Río Alejandro is 8.1h.UV index
January through September and November, with an average maximum UV index of 7, are months with the highest UV index. A UV Index reading of 6 to 7 represents a high health risk from unprotected exposure to Sun's UV rays for average individuals.Note: A typical high UV index of 7 in September suggests the following recommendations:
Use measures and accept sun safety conventions. Guarding against skin and eye trauma is of high priority. The time between 10 a.m. and 4 p.m. is when UV radiation is at its peak. Limit exposure to direct sunlight during these hours. Sunglasses that guard against UVA and UVB rays are pivotal in minimizing sun-induced ocular damage.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Río Alejandro, Panama
- Average high temperature in September: 28.7°C
The warmest month (with the highest average high temperature) is May (29.1°C).
The month with the lowest average high temperature is December (27.8°C).
- Average low temperature in September: 25.1°C
The month with the highest average low temperature is June (25.7°C).
The coldest months (with the lowest average low temperature) are January and February (24.8°C).
Average pressure in September
Río Alejandro, Panama
- Average pressure in September: 1009.9mbar
The month with the highest atmospheric pressure is March (1011.3mbar).
The months with the lowest atmospheric pressure are October and November (1009.6mbar).
Average wind speed in September
Río Alejandro, Panama
- Average wind speed in September: 7.3km/h
The windiest month (with the highest average wind speed) is March (15.8km/h).
The calmest month (with the lowest average wind speed) is September (7.3km/h).
Average humidity in September
Río Alejandro, Panama
- Average humidity in September: 84%
The month with the highest relative humidity is July (86%).
The month with the lowest relative humidity is March (80%).
Average rainfall in September
Río Alejandro, Panama
- Average rainfall in September: 88mm
The wettest month (with the highest rainfall) is July (144mm).
The driest month (with the least rainfall) is February (17mm).
Average rainfall days in September
Río Alejandro, Panama
- Average rainfall days in September: 24.2 days
The month with the highest number of rainy days is July (26.3 days).
The month with the least rainy days is February (15.2 days).
Average daylight in September /
Average sunshine in September
Río Alejandro, Panama
- Average daylight in September: 12h and 12min
The month with the longest days is June (Average daylight: 12h and 42min).
The month with the shortest days is December (Average daylight: 11h and 36min).
- Average sunshine in September: 8h and 6min
The month with the most sunshine is May (Average sunshine: 8h and 36min).
The month with the least sunshine is November (Average sunshine: 5h and 36min).
Average sunshine days in September
Río Alejandro, Panama
- Average sunshine days in September: 4.5 days
The month with the most sunshine days is March (9.6 days).
The month with the least sunshine days is July (3.2 days).
Average UV index in September
Río Alejandro, Panama
- Average UV index in September: 7
The months with the highest UV index are January, February, March, April, May, June, July, August, September and November (UV index 7).
The months with the lowest UV index are October and December (UV index 6).
Average cloud cover in September
Río Alejandro, Panama
- Average cloud cover in September: 44
The months with the most cloud cover are July and December (Cloud cover 55).
The month with the least cloud cover is September (Cloud cover 44).
Average visibility in September
Río Alejandro, Panama
- Average visibility in September: 10km
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).








