September weather forecast
Ribeira Grande, Portugal

The first month of the autumn, September, is also a moderately hot month in Ribeira Grande, Portugal, with temperature in the range of an average low of 18°C (64.4°F) and an average high of 24°C (75.2°F).

Temperature

A minor adjustment in Ribeira Grande's average high-temperature is noted with the start of September, touching a still moderately hot 24°C (75.2°F) from August's 25°C (77°F). Ribeira Grande experiences an average low-temperature reading of 18°C (64.4°F) throughout September.

Rainfall

In Ribeira Grande, during September, the rain falls for 15 days and regularly aggregates up to 82mm (3.23") of precipitation. Throughout the year, in Ribeira Grande, there are 196 rainfall days, and 1009mm (39.72") of precipitation is accumulated.

Sea temperature

August and September, with an average sea temperature of 23°C (73.4°F), are months with the warmest seawater.
Note: Imagine a swim in 23°C (73.4°F) waters. How you'd feel depends on your cold sensitivity, the sun's rays, the caress of the wind, and the warmth enveloping you. Comparatively, Olympic swimmers train in waters between 25°C (77°F) and 28°C (82.4°F).

Daylight

In Ribeira Grande, Portugal, the average length of the day in September is 12h and 25min.
On the first day of September in Ribeira Grande, sunrise is at 07:12 and sunset at 20:11. On the last day of the month, sunrise is at 07:37 and sunset at 19:26 +00.

Sunshine

In September, the average sunshine in Ribeira Grande is 6h.

UV index

In Ribeira Grande, the average daily maximum UV index in September is 7. A UV Index of 6 to 7 symbolizes a high health hazard from exposure to the Sun's UV radiation for average individuals.
Note: In September, the average maximum UV index of 7 translates into the following recommendations:
Act on precautions and pay attention to sun safety recommendations. Avoidance of sunburn is obligatory. Avoid direct Sun exposure from 10 a.m. to 4 p.m., a period when UV radiation is most intense, and remember that not all shade structures provide full protection. For minimizing sun-related eye damage, always choose sunglasses with UVA and UVB coverage. Be wary! Reflections from sand and water make UV radiation more intense.