Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average sea temperature in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
The shift from August to September coincides with a small decrease in the average high-temperature, down to a pleasant 22.1°C (71.8°F) from a moderately hot 25.6°C (78.1°F). Throughout September, the temperature in Portofino tends to fall to a consistent average low of 16.3°C (61.3°F).Humidity
In Portofino, the average relative humidity in September is 74%.Rainfall
The month with the least rainfall in Portofino is September, when the rain falls for 13.9 days and typically collects 47mm (1.85") of precipitation.Snowfall
April through November are months without snowfall in Portofino, Italy.Sea temperature
In Portofino, the average seawater temperature in September is 23.2°C (73.8°F).Note: When considering a person's aversion to cold, factors like sunshine, wind, and atmospheric temperature are key. Swimming in 23.2°C (73.8°F) might be delightful. (Remember: The Olympics' swimming events have water temperatures between 25°C (77°F) and 28°C (82.4°F).)
Daylight
In September, the average length of the day is 12h and 31min.On the first day of the month, sunrise is at 06:46 and sunset at 19:59. On the last day of September, sunrise is at 07:20 and sunset at 19:05 CEST.
Sunshine
In Portofino, the average sunshine in September is 9.7h.UV index
In Portofino, the average daily maximum UV index in September is 5. A UV Index estimate of 3 to 5 represents a moderate threat to health from unprotected exposure to Sun's UV rays for average individuals.Note: The UV index of 5 during September leads to these advisories:
Heed the precautions - Protecting the skin and eyes from damage is compulsory. During midday, the Sun's radiation is strongest, and it's advisable to reduce direct exposure. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation. Beware! Reflections from sand and water can intensify the Sun's UV radiation.
Frequently asked questions
What are the temperatures in Portofino in September?
What is the average humidity in September in Portofino?
What is the driest month in Portofino?
How many days does it rain in September in Portofino?
When it does not snow in Portofino?
How warm is the water in September in Portofino?
What is the average length of the day in September in Portofino?
What time are sunrise and sunset in September in Portofino?
How long on average sun shines in September in Portofino?
What is the UV index reading in September in Portofino?
Average temperature in September
Portofino, Italy
- Average high temperature in September: 22.1°C
The warmest month (with the highest average high temperature) is August (25.6°C).
The month with the lowest average high temperature is January (8.3°C).
- Average low temperature in September: 16.3°C
The month with the highest average low temperature is August (19.3°C).
The coldest month (with the lowest average low temperature) is February (4.9°C).
Average pressure in September
Portofino, Italy
- Average pressure in September: 1015.7mbar
The month with the highest atmospheric pressure is December (1018.7mbar).
The months with the lowest atmospheric pressure are April, May and July (1013.9mbar).
Average wind speed in September
Portofino, Italy
- Average wind speed in September: 8.8km/h
The windiest month (with the highest average wind speed) is February (12.2km/h).
The calmest month (with the lowest average wind speed) is August (7.8km/h).
Average humidity in September
Portofino, Italy
- Average humidity in September: 74%
The month with the highest relative humidity is November (80%).
The month with the lowest relative humidity is August (72%).
Average rainfall in September
Portofino, Italy
- Average rainfall in September: 47mm
The wettest month (with the highest rainfall) is November (118mm).
The driest month (with the least rainfall) is September (47mm).
Average rainfall days in September
Portofino, Italy
- Average rainfall days in September: 13.9 days
The month with the highest number of rainy days is May (18.7 days).
The month with the least rainy days is January (11.3 days).
Average snowfall in September
Portofino, Italy
- Average snowfall in September: 0mm
The month with the highest snowfall is March (6mm).
The months with the least snowfall are April, May, June, July, August, September, October and November (0mm).
Average snowfall days in September
Portofino, Italy
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (0.6 days).
The months with the least snowfall days are April, May, June, July, August, September, October and November (0 days).
Average sea temperature in September
Portofino, Italy
- Average sea temperature in September: 23.2°C
The best month for swimming (with the highest average sea temperature) is August (24.4°C).
The coldest month (with the lowest average sea temperature) is February (13°C).
Average daylight in September /
Average sunshine in September
Portofino, Italy
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 30min).
The month with the shortest days is December (Average daylight: 8h and 54min).
- Average sunshine in September: 9h and 4min
The months with the most sunshine are June and July (Average sunshine: 11h and 30min).
The month with the least sunshine is November (Average sunshine: 5h and 18min).
Average sunshine days in September
Portofino, Italy
- Average sunshine days in September: 13.5 days
The month with the most sunshine days is January (17.1 days).
The month with the least sunshine days is May (8.8 days).
Average UV index in September
Portofino, Italy
- Average UV index in September: 5
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is January (UV index 2).
Average cloud cover in September
Portofino, Italy
- Average cloud cover in September: 24
The month with the most cloud cover is November (Cloud cover 44).
The month with the least cloud cover is August (Cloud cover 17).
Average visibility in September
Portofino, Italy
- Average visibility in September: 10km
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October and December (10km).
The month with the lowest visibility is November (9km).
Portofino, Italy
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