September weather forecast
San Juan, Dominican Republic

San Juan embraces a warm climate in September. Rainfall levels remain quite high, making it one of the wettest months of the year. The hours of daylight start to decrease further, signifying the end of the long summer days. As the city transitions towards autumn, the tropical weather persists. The combination of rainfall and sunshine makes September an exciting month climatically.

Temperature

The warmest period in San Juan is usually observed in July through September, with the average high-temperature peaking at 32°C (89.6°F).

Rainfall

In San Juan, in September, during 15 rainfall days, 155mm (6.1") of precipitation is typically accumulated. Throughout the year, in San Juan, there are 154 rainfall days, and 1160mm (45.67") of precipitation is accumulated.

Daylight

The average length of the day in September is 12h and 14min.
On the first day of September in San Juan, Dominican Republic, sunrise is at 06:30 and sunset at 18:59. On the last day of the month, sunrise is at 06:35 and sunset at 18:34 AST.

Sunshine

The months with the least sunshine in San Juan are January, May, September through December, with an average of 7h of sunshine.

UV index

March through September, with an average maximum UV index of 12, are months with the highest UV index. A UV Index estimate of 11, and higher, represents an extreme threat to health from exposure to the Sun's UV radiation for the ordinary person.
Note: In September, the maximum UV index of 12 translates into these guidelines:
Adopt all essential precautions. Preventing sun harm is crucial. 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. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days. Apply generously and frequently a broad-spectrum SPF 30+ sunscreen every two hours, or immediately after swimming or any outdoor exercise.