September weather forecastPalermo, Italy
September
Weather in September
The arrival of September indicates the commencement of shoulder season in Palermo's weather dynamics. While still pretty warm with high temperatures averaging 25.5°C (77.9°F), rainfall increases markedly to 57mm (2.24"), signalling autumn's advent. Although sea temperatures remain relatively high at 25.1°C (77.2°F), the days start to shorten as daylight duration drops to 12.4 hours. October continues with the descent from summer's peak.Temperature
September in Palermo is characterized by a slight reduction in average high-temperature, easing from a moderately hot 29.8°C (85.6°F) in August to a still warm 25.5°C (77.9°F). Throughout September, Palermo records an average temperature of 19.8°C (67.6°F) at night.Humidity
In September, the average relative humidity is 68%.Rainfall
The wettest months in Palermo are September and October, with an average 57mm (2.24") of rainfall.Snowfall
In Palermo, snow does not fall in February through November.Sea temperature
In Palermo, the average seawater temperature in September is 25.1°C (77.2°F).Note: Water activities including swimming and diving at temperatures from 25°C (77°F) to 29°C (84.2°F) are deemed very pleasurable and enjoyable for extended periods, devoid of discomfort.
Daylight
In September, the average length of the day is 12h and 26min.On the first day of the month, sunrise is at 06:36 and sunset at 19:36. On the last day of September, sunrise is at 07:01 and sunset at 18:51 CEST.
Sunshine
In September, the average sunshine in Palermo is 10.8h.UV index
The average daily maximum UV index in September in Palermo, Italy, is 6. A UV Index estimate of 6 to 7 represents a high health risk from exposure to the Sun's UV radiation for the average person.Note: In September, the average maximum UV index of 6 translates into the following recommendations:
Elude overexposure. Fair-skinned people could get burnt in less than 20 minutes. The time between 10 a.m. and 4 p.m. is when UV radiation is at its peak. Limit exposure to direct sunlight during these hours. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly. Caution! The Sun's UV intensity grows with reflections off sand and water.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Palermo, Italy
- Average high temperature in September: 25.5°C
The warmest month (with the highest average high temperature) is August (29.8°C).
The month with the lowest average high temperature is February (12.5°C).
- Average low temperature in September: 19.8°C
The month with the highest average low temperature is August (22°C).
The coldest month (with the lowest average low temperature) is February (6.8°C).
Average pressure in September
Palermo, Italy
- Average pressure in September: 1015.6mbar
The month with the highest atmospheric pressure is December (1019mbar).
The months with the lowest atmospheric pressure are April and July (1014.3mbar).
Average wind speed in September
Palermo, Italy
- Average wind speed in September: 8.9km/h
The windiest month (with the highest average wind speed) is February (13.9km/h).
The calmest month (with the lowest average wind speed) is August (7.8km/h).
Average humidity in September
Palermo, Italy
- Average humidity in September: 68%
The month with the highest relative humidity is January (79%).
The month with the lowest relative humidity is July (59%).
Average rainfall in September
Palermo, Italy
- Average rainfall in September: 57mm
The wettest months (with the highest rainfall) are September and October (57mm).
The driest month (with the least rainfall) is July (5mm).
Average rainfall days in September
Palermo, Italy
- Average rainfall days in September: 12.5 days
The month with the highest number of rainy days is January (13.6 days).
The month with the least rainy days is July (3.3 days).
Average snowfall in September
Palermo, Italy
- Average snowfall in September: 0mm
The month with the highest snowfall is January (2mm).
The months with the least snowfall are February, March, April, May, June, July, August, September, October and November (0mm).
Average snowfall days in September
Palermo, Italy
- Average snowfall days in September: 0 days
The months with the highest number of snowfall days are January and December (0.1 days).
The months with the least snowfall days are February, March, April, May, June, July, August, September, October and November (0 days).
Average sea temperature in September
Palermo, Italy
- Average sea temperature in September: 25.1°C
The best month for swimming (with the highest average sea temperature) is August (26.3°C).
The coldest month (with the lowest average sea temperature) is February (14.3°C).
Average daylight in September /
Average sunshine in September
Palermo, Italy
- Average daylight in September: 12h and 24min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in September: 10h and 48min
The months with the most sunshine are June and July (Average sunshine: 12h and 6min).
The month with the least sunshine is January (Average sunshine: 5h and 42min).
Average sunshine days in September
Palermo, Italy
- Average sunshine days in September: 15.7 days
The month with the most sunshine days is July (26.6 days).
The month with the least sunshine days is February (14.3 days).
Average UV index in September
Palermo, Italy
- Average UV index in September: 6
The months with the highest UV index are July and August (UV index 7).
The months with the lowest UV index are January, February and December (UV index 3).
Average cloud cover in September
Palermo, Italy
- Average cloud cover in September: 19
The month with the most cloud cover is January (Cloud cover 40).
The month with the least cloud cover is July (Cloud cover 7).
Average visibility in September
Palermo, Italy
- Average visibility in September: 10km
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
