September weather forecast
Puerto Rico, Spain

September represents a gradual departure from the summer season in Puerto Rico. As rainfall increases to 12mm (0.47"), the intense dry spell witnesses a mild break. A slight decrease in daylight hours is registered. Sea temperatures remain quite warm, favouring aquatic leisure activities. Although summer is phasing out, sudden spikes in temperature marking the last heatwaves might be anticipated.

Temperature

September in Puerto Rico observes an average high-temperature of a still warm 25°C (77°F), marking an insignificant difference from August's 26°C (78.8°F). The mean low-temperature during September nights is an enjoyable 18°C (64.4°F).

Rainfall

In September, the rain falls for 1 days. Throughout September, 12mm (0.47") of precipitation is accumulated. In Puerto Rico, Spain, during the entire year, the rain falls for 21 days and collects up to 291mm (11.46") of precipitation.

Sea temperature

In Puerto Rico, in September, the average water temperature is 23.5°C (74.3°F).
Note: If cold is not your friend, swimming at 23.5°C (74.3°F) might be daunting. But the right mix of sunshine, wind, and external temperature can make a difference. Although wetsuits are not essential, they can enhance the swimming experience.

Daylight

In September, the average length of the day is 12h and 19min.
On the first day of the month, sunrise is at 07:41 and sunset at 20:23. On the last day of September, in Puerto Rico, sunrise is at 07:55 and sunset at 19:49 WEST.

Sunshine

The average sunshine in September in Puerto Rico is 8h.

UV index

In September, the average daily maximum UV index is 9. A UV Index reading of 8 to 10 represents a very high health risk from exposure to the Sun's UV radiation for ordinary individuals.
Note: The maximum UV index of 9 during September translates into these guidelines:
Without constant care, eyes and skin might suffer damage in a short time. It's important to stay in the shade and limit exposure to the sun from 10 a.m. to 4 p.m., when UV radiation is most intense, although remember that shade structures may not provide full sun protection. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays. Minimize prolonged exposure to direct sunlight, especially for those who burn quickly. Use sunscreen with a minimum 30 SPF always. Notice! The Sun's UV exposure elevates with sand and water reflections.