September weather forecast
San Juan del Sur, Nicaragua

The weather in San Juan del Sur during September witnesses a slight withdrawal in rainfall, dropping to 81mm (3.19"). The weather remains relatively steady with warm temperatures prevailing throughout the month. Nature blossoms in the aftermath of the rainy season, displaying an enchanting array of flora and fauna. The nearly constant sea temperature further upholds the allure of water activities. With a lower pressure of 1010.5mb, this month promises a serene ambience for relaxation.

Temperature

San Juan del Sur, Nicaragua, commences September with an average high-temperature of a still hot 30.1°C (86.2°F), maintaining a close resemblance to the previous month. San Juan del Sur encounters a negligible difference from daytime peaks throughout the September nights, with a low-temperature average of 25.2°C (77.4°F).

Heat index

For September, the heat index is evaluated at a fiery hot 38°C (100.4°F). Adopt extra safety steps, risk of heat exhaustion and heat cramps is notable. Sustained activity might cause heatstroke.
Bear in mind that the heat index values are determined for shaded areas and light breezes. An exposure to direct sunlight may lift the heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'apparent temperature', provides an understanding of perceived warmth by combining temperature and relative humidity. Factors such as metabolic variation, pregnancy, and physical activity play a role in one's impression of weather. When you're directly under the sun's rays, remember that the heat index may surge by 15 Fahrenheit (8 Celsius) degrees. Heat index values are extremely vital to babies and toddlers. In general, children are more at risk than adults because they sweat less. Furthermore, the large skin surface compared to their small bodies and the high heat production due to their actions contribute to this vulnerability.
When faced with excessive heat, the human body begins to perspire, utilizing the cooling benefits of sweat evaporation. In situations of high air temperature combined with high humidity (significant heat index), the body's ability to perspire is reduced, heightening the sense of warmth. The body faces dehydration threats when its cooling efforts are outpaced by excessive heat gain.

Humidity

In San Juan del Sur, the average relative humidity in September is 79%.

Rainfall

In September, in San Juan del Sur, Nicaragua, the rain falls for 23.5 days. Throughout September, 81mm (3.19") of precipitation is accumulated. In San Juan del Sur, Nicaragua, during the entire year, the rain falls for 237.9 days and collects up to 717mm (28.23") of precipitation.

Sea temperature

In September, the average sea temperature in San Juan del Sur, Nicaragua, is 29.2°C (84.6°F).
Note: In water activities such as swimming and diving, temperatures from 25°C (77°F) to 29°C (84.2°F) are deemed highly pleasurable for extended periods without any unease.

Daylight

In San Juan del Sur, the average length of the day in September is 12h and 11min.
On the first day of September in San Juan del Sur, sunrise is at 05:33 and sunset at 17:53. On the last day of the month, sunrise is at 05:32 and sunset at 17:34 CST.

Sunshine

In September, the average sunshine in San Juan del Sur is 8.3h.

UV index

The months with the highest UV index are January through December, with an average maximum UV index of 7. January through December, with an average maximum UV index of 7, are months with the lowest UV index. A UV Index of 6 to 7 symbolizes a high health vulnerability from unsafe exposure to UV radiation for the average person.
Note: The maximum daily UV index of 7 in September converts into the following recommendations:
Inhibit overexposure. Warding off sun damage is of utmost importance. Between 10 a.m. and 4 p.m., UV radiation is strongest. Make an effort to avoid direct sunlight during this time, remembering that shade structures may not provide full sun protection. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses. Beware! The strength of the UV rays is significantly increased by the reflection of the water and sand.