September weather forecast
Coyolar, Costa Rica

September, the first month of the autumn in Coyolar, is also a moderately hot month, with an average temperature varying between 28.9°C (84°F) and 23.2°C (73.8°F).

Temperature

Coyolar's transition from August to September introduces an average high-temperature of a still moderately hot 28.9°C (84°F), marking an insignificant variation from the 29.4°C (84.9°F). September nights in Coyolar, Costa Rica, cool down to an average low-temperature of 23.2°C (73.8°F).

Heat index

September's mean heat index is calculated to be a very hot 35°C (95°F). Exercise more precautions, heat cramps and heat exhaustion are potential risks. Continuous activity could precipitate heatstroke.
Given the heat index, its values are aligned with shaded sites and gentle winds. When under direct sunshine, the heat index may be elevated by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature' or 'apparent temperature', is a numerical representation of warmth when taking temperature and moisture levels into account. Depending on the activity and the individual's heat perception, which may vary due to factors including wind, clothing, and metabolic variations, this effect remains subjective. Awareness of direct sun exposure is crucial as it has the potential to heighten the weather's effects, pushing up the heat index by 15 Fahrenheit (8 Celsius) degrees. Heat index values are largely significant for babies and toddlers. Children regularly disregard the necessity to rest and replenish fluids. Thirst is a late symptom of dehydration - thus, maintaining hydration, particularly during long-lasting physical activities, is essential.
The human body normally cools itself by perspiration, as evaporated sweat carries heat away from the body. Augmented relative humidity impedes typical body cooling mechanisms by lowering the evaporation rate, resulting in decreased body cooling and an amplified perception of heat. When heat surpasses the body's release mechanisms, dehydration and overheating risks become pronounced.

Humidity

In September, the average relative humidity in Coyolar is 82%.

Rainfall

In Coyolar, in September, during 27.7 rainfall days, 193mm (7.6") of precipitation is typically accumulated. Throughout the year, there are 218.6 rainfall days, and 1456mm (57.32") of precipitation is accumulated.

Daylight

In September, the average length of the day in Coyolar is 12h and 11min.
On the first day of September in Coyolar, sunrise is at 05:28 and sunset at 17:47. On the last day of the month, sunrise is at 05:26 and sunset at 17:29 CST.

Sunshine

In September, the average sunshine is 8.7h.

UV index

The months with the highest UV index are January through September and December, with an average maximum UV index of 7. A UV Index reading of 6 to 7 represents a high health risk from exposure to the Sun's UV radiation for the average person.
Note: A maximum UV index of 7 in September translates into the following recommendations:
Persist in precautions and follow sun safety policies. Keeping sunburn at bay is imperative. The Sun's UV radiation is most intense from 10 a.m. to 4 p.m. Try to avoid direct sun exposure during these hours. To best shield against UV radiation, choose sun-safe garments and dependable sunglasses.