September weather forecastGibraltar, Gibraltar

Weather in September

The transition from summer to autumn begins in September with marginal changes in Gibraltar's temperature. The sea temperature starts to decrease yet holds at a still comfortable 21.8°C (71.2°F) for swimming. Daylight shortens to 12.4 hours and leads to a decrease in daily sunshine hours to nine. The negligible rainfall from the height of summer starts to show a slight increase, indicating the approaching wet season. The UV index drops to seven offering more relief from the sun's intense rays as the summer season wanes.

Temperature

With the onset of September, the average high-temperature subtly recedes from August's moderately hot 29°C (84.2°F) to a still warm 26°C (78.8°F). Throughout September, Gibraltar's nights cool down to an average of 19°C (66.2°F).

Rainfall

In Gibraltar, in September, it is raining for 2 days, with typically 23mm (0.91") of accumulated precipitation. Throughout the year, there are 63.5 rainfall days, and 767mm (30.2") of precipitation is accumulated.

Sea temperature

In Gibraltar, Gibraltar, the average seawater temperature in September is 21.8°C (71.2°F).
Note: Most individuals do not find swimming at 21.8°C (71.2°F) to be enjoyable. As the water temperature declines below 21°C (69.8°F), maintaining control over one's breathing becomes harder.

Daylight

In September, the average length of the day is 12h and 24min.
On the first day of the month, sunrise is at 07:53 and sunset at 20:49. On the last day of September, sunrise is at 08:16 and sunset at 20:06 CEST.

Sunshine

The average sunshine in September is 9h.

UV index

In Gibraltar, the average daily maximum UV index in September is 7. A UV Index of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV radiation for average individuals.
Note: An average maximum UV index of 7 in September leads to these recommendations:
Take precautions against overexposure. Fair-skinned people may get burned in less than 20 minutes. Seek shade and limit direct sun exposure between 10 a.m. and 4 p.m., the peak period for UV radiation. Keep in mind that shade structures like parasols or canopies do not offer complete sun protection. Wearing sunglasses with both UVA and UVB protection effectively reduces sun-induced eye damage. Warning! The reflection of sand and water increases the UV dose.