September weather forecast
Rio San Juan, Dominican Republic

September complements August's framework, as the rainfall slightly decreases, measuring at 131mm (5.16"). As a result, the city undergoes subtle atmospheric shifts, preparing for the upcoming transition into the cooler part of the year. Despite the minor changes, the city's robust tropical character remains evident. Short bursts of rainfall ensure a fertile ground, against the backdrop of the warm and sunlit panorama that dominates September.

Temperature

Rio San Juan experiences peak temperatures, averaging a high-temperature of 32°C (89.6°F) during June through September.

Rainfall

In Rio San Juan, in September, during 15 rainfall days, 131mm (5.16") of precipitation is typically accumulated. Throughout the year, there are 162 rainfall days, and 1895mm (74.61") of precipitation is accumulated.

Sea temperature

The month with the warmest seawater in Rio San Juan is September, with an average sea temperature of 29.2°C (84.6°F).
Note: Engaging in swimming, diving, or other water activities is highly enjoyable in temperatures ranging from 25°C (77°F) to 29°C (84.2°F), without any unpleasant sensations for prolonged durations.

Daylight

In Rio San Juan, the average length of the day in September is 12h and 15min.
On the first day of September, sunrise is at 06:25 and sunset at 18:55. On the last day of the month, sunrise is at 06:30 and sunset at 18:29 AST.

Sunshine

In Rio San Juan, the average sunshine in September is 7h.

UV index

In September, the average daily maximum UV index in Rio San Juan is 11. A UV Index estimate of 11, and higher, represents an ultimate health vulnerability from unprotected exposure to Sun's UV rays for average individuals.
Note: The daily maximum UV index of 11 in September interprets into the following advice:
Adopt all important safety measures, unprotected skin may burn rapidly. Avoid exposure to the Sun and try to stay in the shade between 10 a.m. and 4 p.m., when UV radiation is most potent, but be aware that parasols or canopies may not offer full protection. Tightly woven clothing, when worn loosely, shields effectively against the Sun. One must apply and reapply generously an SPF 30+ broad-spectrum sunscreen every two hours or after an outdoor workout or swim. Note! The Sun's UV radiation gets intensified with the reflection from sand and water.