September weather forecast
Tronadora, Costa Rica

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

Temperature

In Tronadora, the average high-temperature in September is essentially the same as in August - a still moderately hot 28.9°C (84°F). The average low-temperature, is 23.2°C (73.8°F).

Heat index

The average heat index in September is evaluated at a very hot 35°C (95°F). Take special precautions - heat exhaustion and heat cramps are expected. Heatstroke may occur with lengthy activity.
Take into consideration that the heat index values are calculated for shade and light wind conditions. Exposure to direct sunshine can increase heat index values by up to 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'felt air temperature', 'real feel', 'apparent temperature', or 'feels like', is a measure of how hot it feels when the actual air humidity is factored in. This effect is subjective, depending on the activity and individual's heat perception influenced by various reasons (metabolic differences, differences in body mass, height, and shape, clothing). Be aware that direct exposure to sunlight increases heat impact and may raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are especially crucial for babies and toddlers. Children are often less aware of the need to rest and re-hydrate. Thirst is a late sign of dehydration - it is vital to remain hydrated, particularly during prolonged physical activities.
To prevent overheating and help regulate its internal temperature, the human body sweat and rely on the evaporation to cool down. A higher relative humidity affects normal body cooling by reducing the evaporation rate, subsequently lowering the rate at which the body cools and increasing the perception of heat. When heat gain surpasses the level the body can shed, body temperature begins to increase, and consequently, overheating and dehydration can occur, with varying severity.

Humidity

The average relative humidity in September in Tronadora is 82%.

Rainfall

In September, the rain falls for 27.7 days. Throughout September, 193mm (7.6") of precipitation is accumulated. In Tronadora, during the entire year, the rain falls for 218.6 days and collects up to 1456mm (57.32") of precipitation.

Daylight

In Tronadora, the average length of the day in September is 12h and 11min.
On the first day of September, sunrise is at 05:30 and sunset at 17:49. On the last day of the month, sunrise is at 05:28 and sunset at 17:30 CST.

Sunshine

In September, the average sunshine in Tronadora is 8.7h.

UV index

January through September and December, with an average maximum UV index of 7, are months with the highest UV index in Tronadora. A UV Index value of 6 to 7 symbolizes a high health risk from exposure to the Sun's UV radiation for average individuals.
Note: In September, the average maximum UV index of 7 translate into the following recommendations:
Take precautions against overexposure. Protection against sun damage is needed. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun.