September weather forecast
Santa Elena, Costa Rica

In September, Santa Elena's storied rainy season commences its eventual conclusion. There's a slight reduction to 193mm (7.6") in rainfall from the downpour from the previous month and it further decreases as the city transitions into October. Despite the lessening showers, September engages in ample cloud cover, providing a balmy climate under the abundant overcast. The cloudy skies, paired with mild winds, establish a compelling atmosphere that intrigues weather watchers around the globe.

Temperature

The beginning of September records an average high-temperature of a still moderately hot 28.9°C (84°F), almost echoing the conditions of the previous month. During September, Santa Elena consistently records a temperature low averaging a still warm 23.2°C (73.8°F).

Heat index

The heat index value for September is calculated to be a fiery hot 35°C (95°F). Exercise increased caution, heat cramps and heat exhaustion are potential hazards. Continuous activity could lead to heatstroke.
Factoring in the heat index, values are geared towards shaded areas with light breezes. The direct sun can potentially cause the heat index to increase by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'real feel', measures the perceived warmth when incorporating the humidity present in the air. The impact of weather is individual, with diverse individuals experiencing it differently due to variations in body mass, height, and activity levels. Direct sun exposure is noteworthy in its ability to escalate the felt temperature, potentially adding 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values hold particular importance for children. Children typically face more danger than adults as their sweat production is usually lower. Additionally, the bigger skin surface compared to their small size and the increased heat due to their activeness exacerbate the risk.
When the body gets too warm, it perspires, leading to sweat evaporation which cools it down. Higher relative humidity impedes evaporation, thus reducing heat dispersion from the body, culminating in a sensation of overheating. With body temperatures on the rise, inefficient heat shedding can lead to dehydration and its associated complications.

Humidity

The average relative humidity in September in Santa Elena is 82%.

Rainfall

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

Daylight

In September, the average length of the day is 12h and 11min.
On the first day of the month, sunrise is at 05:29 and sunset at 17:48. On the last day of September, sunrise is at 05:27 and sunset at 17:30 CST.

Sunshine

In Santa Elena, the average sunshine in September 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 Santa Elena, Costa Rica. A UV Index of 6 to 7 symbolizes a high health risk from exposure to the Sun's UV rays for the ordinary person.
Note: The maximum UV index of 7 during September translates into these guidelines:
Fend off overexposure. Sun protection is vital. Minimize exposure to direct sunlight and seek shade from 10 a.m. to 4 p.m., when UV radiation is most intense, but remember that shade structures may not offer complete protection. To cut down UV radiation exposure by about half, sport a wide-brim hat.