September weather forecast
Gibraltar, Gibraltar

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

As September commences in Gibraltar, the average high-temperature subtly reduces, transitioning from 29°C (84.2°F) in August to a still warm 26°C (78.8°F). Gibraltar records an average low-temperature of 19°C (66.2°F) throughout the month of September.

Rainfall

In Gibraltar, in September, during 2 rainfall days, 23mm (0.91") of precipitation is typically accumulated. In Gibraltar, during the entire year, the rain falls for 63.5 days and collects up to 767mm (30.2") of precipitation.

Sea temperature

In Gibraltar, in September, the average water temperature is 21.8°C (71.2°F).
Note: The majority of people find swimming in 21.8°C (71.2°F) unenjoyable. As the water temperature decreases from 21°C (69.8°F) to 15°C (59°F), breathing becomes more challenging to control.

Daylight

In September, the average length of the day in Gibraltar 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

In September, the average sunshine in Gibraltar is 9h.

UV index

In September, the average daily maximum UV index is 7. A UV Index of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV radiation for the ordinary person.
Note: The UV index of 7 during September translates into the following guidance:
Escape overexposure. People with light skin may incur burns in fewer than 20 minutes. The Sun's UV radiation is most potent between 10 a.m. and 4 p.m. Try to limit direct exposure to the Sun during this period. A hat with a generous brim can prevent nearly 50% of UV rays from reaching your eyes. Beware! The reflection of water and sand dramatically increases exposure to the UV rays.