September weather forecastSines, Portugal
September weather for Sines, Portugal: The first month of the autumn, September, is also a moderately hot month in Sines, Portugal, with an average temperature fluctuating between 18.8°C (65.8°F) and 23.5°C (74.3°F). In Sines, Portugal, in September, during 4.1 rainfall days, 13mm (0.51") of precipitation is typically accumulated.
September
Weather in September
The first month of the autumn, September, is also a moderately hot month in Sines, Portugal, with an average temperature fluctuating between 18.8°C (65.8°F) and 23.5°C (74.3°F).Temperature
As August turns into September, the average high-temperatures rest at a still warm 23.5°C (74.3°F), showing a minor variation from the prior month. Nighttime temperatures in Sines hover around an average low of 18.8°C (65.8°F) in September, a slight descent from daytime highs.Humidity
The average relative humidity in September is 73%.Rainfall
In September, the rain falls for 4.1 days. Throughout September, 13mm (0.51") of precipitation is accumulated. In Sines, Portugal, during the entire year, the rain falls for 94.6 days and collects up to 327mm (12.87") of precipitation.Sea temperature
In September, the average sea temperature in Sines is 20.4°C (68.7°F).Note: A majority do not enjoy swimming in water at 20.4°C (68.7°F). The difficulty in controlling breathing increases progressively as the temperature dips below 21°C (69.8°F).
Daylight
In Sines, Portugal, the average length of the day in September is 12h and 26min.On the first day of September in Sines, sunrise is at 07:05 and sunset at 20:04. On the last day of the month, sunrise is at 07:30 and sunset at 19:19 WEST.
Sunshine
The average sunshine in September is 9.5h.UV index
June through September, with an average maximum UV index of 6, are months with the highest UV index. A UV Index estimate of 6 to 7 represents a high health hazard from unsafe exposure to UV radiation for average individuals.Note: An average maximum UV index of 6 in September leads to these recommendations:
Conform to measures and uphold sun safety traditions. Warding off skin and eye harm is necessary. Avoid exposure to the Sun and try to stay in the shade between 10 a.m. and 4 p.m., when UV radiation is most potent, but be aware that parasols or canopies may not offer full protection. Consider a wide-brim hat essential for effective sun defense covering your face, neck, and eyes.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Sines, Portugal
- Average high temperature in September: 23.5°C
The warmest month (with the highest average high temperature) is August (24.2°C).
The month with the lowest average high temperature is February (14.8°C).
- Average low temperature in September: 18.8°C
The months with the highest average low temperature are August and September (18.8°C).
The coldest month (with the lowest average low temperature) is February (10.8°C).
Average pressure in September
Sines, Portugal
- Average pressure in September: 1016.9mbar
The month with the highest atmospheric pressure is December (1022.6mbar).
The month with the lowest atmospheric pressure is April (1015.7mbar).
Average wind speed in September
Sines, Portugal
- Average wind speed in September: 15.1km/h
The windiest month (with the highest average wind speed) is February (19.4km/h).
The calmest month (with the lowest average wind speed) is September (15.1km/h).
Average humidity in September
Sines, Portugal
- Average humidity in September: 73%
The month with the highest relative humidity is April (76%).
The month with the lowest relative humidity is October (72%).
Average rainfall in September
Sines, Portugal
- Average rainfall in September: 13mm
The wettest month (with the highest rainfall) is November (56mm).
The driest month (with the least rainfall) is July (1mm).
Average rainfall days in September
Sines, Portugal
- Average rainfall days in September: 4.1 days
The month with the highest number of rainy days is November (13.4 days).
The month with the least rainy days is August (1.1 days).
Average sea temperature in September
Sines, Portugal
- Average sea temperature in September: 20.4°C
The best month for swimming (with the highest average sea temperature) is October (20.5°C).
The coldest month (with the lowest average sea temperature) is March (15.6°C).
Average daylight in September /
Average sunshine in September
Sines, Portugal
- 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: 9h and 30min
The month with the most sunshine is July (Average sunshine: 11h and 30min).
The month with the least sunshine is January (Average sunshine: 5h and 42min).
Average sunshine days in September
Sines, Portugal
- Average sunshine days in September: 25.1 days
The month with the most sunshine days is August (29.4 days).
The month with the least sunshine days is April (15.3 days).
Average UV index in September
Sines, Portugal
- Average UV index in September: 6
The months with the highest UV index are June, July, August and September (UV index 6).
The months with the lowest UV index are January, February, March, April, November and December (UV index 4).
Average cloud cover in September
Sines, Portugal
- Average cloud cover in September: 16
The month with the most cloud cover is January (Cloud cover 37).
The month with the least cloud cover is August (Cloud cover 10).
Average visibility in September
Sines, Portugal
- 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).
