September weather forecastAveiro, Portugal
September
Weather in September
September carries forward the warmth of August into the initial phase of autumn in Aveiro. Average temperatures see a slight fall from the summer highs, with the weather remaining comfortably warm. Daily sunshine hours decrease from its summer peak, marking the slow transition to shorter days. Meanwhile, the usual wind speed records a plunge from 11.4km/h (7.1mph) to 9.8km/h (6.1mph), setting a calmer environment. September highlights the precise blend of summer and autumn - navigating between intense sunshine days and the anticipation of harvest.Temperature
September's advent denotes a minor fluctuation in the average high-temperature to a still warm 24.5°C (76.1°F) from August's 25.4°C (77.7°F). Throughout September, an average low-temperature of 15.3°C (59.5°F) is expected in Aveiro.Humidity
The least humid month in Aveiro is September, with an average relative humidity of 70%.Rainfall
In September, in Aveiro, Portugal, the rain falls for 5.8 days. Throughout September, 23mm (0.91") of precipitation is accumulated. In Aveiro, Portugal, during the entire year, the rain falls for 125.4 days and collects up to 619mm (24.37") of precipitation.Daylight
In Aveiro, Portugal, the average length of the day in September is 12h and 28min.On the first day of September in Aveiro, sunrise is at 07:02 and sunset at 20:06. On the last day of the month, sunrise is at 07:30 and sunset at 19:18 WEST.
Sunshine
The average sunshine in September is 9.3h.UV index
The months with the highest UV index are May through September, with an average maximum UV index of 5. A UV Index value of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV radiation for ordinary individuals.Note: In September, a daily UV index of 5 turns into the following recommendations:
Undertake protective steps - Preventing sun damage is advised. The mid-day Sun emits the most powerful UV radiation, so seek shade and minimize exposure. Sun protection is enhanced with clothing that boasts a tight weave yet offers a loose fit.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Aveiro, Portugal
- Average high temperature in September: 24.5°C
The warmest month (with the highest average high temperature) is August (25.4°C).
The month with the lowest average high temperature is January (13.3°C).
- Average low temperature in September: 15.3°C
The month with the highest average low temperature is August (15.9°C).
The coldest month (with the lowest average low temperature) is February (7.6°C).
Average pressure in September
Aveiro, Portugal
- Average pressure in September: 1017.1mbar
The month with the highest atmospheric pressure is December (1022.6mbar).
The month with the lowest atmospheric pressure is April (1015.3mbar).
Average wind speed in September
Aveiro, Portugal
- Average wind speed in September: 9.8km/h
The windiest month (with the highest average wind speed) is February (12.9km/h).
The calmest month (with the lowest average wind speed) is September (9.8km/h).
Average humidity in September
Aveiro, Portugal
- Average humidity in September: 70%
The month with the highest relative humidity is January (81%).
The month with the lowest relative humidity is September (70%).
Average rainfall in September
Aveiro, Portugal
- Average rainfall in September: 23mm
The wettest month (with the highest rainfall) is November (94mm).
The driest month (with the least rainfall) is July (6mm).
Average rainfall days in September
Aveiro, Portugal
- Average rainfall days in September: 5.8 days
The month with the highest number of rainy days is November (14.9 days).
The month with the least rainy days is August (3.3 days).
Average daylight in September /
Average sunshine in September
Aveiro, Portugal
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in September: 9h and 18min
The month with the most sunshine is July (Average sunshine: 11h and 18min).
The month with the least sunshine is January (Average sunshine: 5h and 12min).
Average sunshine days in September
Aveiro, Portugal
- Average sunshine days in September: 22.7 days
The month with the most sunshine days is August (25.8 days).
The month with the least sunshine days is November (12.9 days).
Average UV index in September
Aveiro, Portugal
- Average UV index in September: 5
The months with the highest UV index are May, June, July, August and September (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 3).
Average cloud cover in September
Aveiro, Portugal
- Average cloud cover in September: 19
The month with the most cloud cover is January (Cloud cover 43).
The months with the least cloud cover are July, August and September (Cloud cover 19).
Average visibility in September
Aveiro, Portugal
- Average visibility in September: 9km
The months with the highest visibility are February, June and December (10km).
The months with the lowest visibility are January, March, April, May, July, August, September, October and November (9km).
